[CentOS-virt] KVM backup

[Gokan Atmaca]

Hello

I take backups while virtual machines are running live. For this,
first I takes snapshot. Then I back up the original disk. But when I
look at the snapshot list (1595157757,1595162592). I see that it is
passive. I cannot delete them either.

What would be the reason ?

Name Creation Time State

 1595157757   2020-07-19 14:22:37 +0300 disk-snapshot
 1595162592   2020-07-19 15:43:12 +0300 disk-snapshot


Error:
error: Failed to delete snapshot 1595162592
error: unsupported configuration: deletion of 1 external disk
snapshots not supported yet

Thanks.
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Re: [CentOS-virt] KVM networking issue

[Mike - st257]

On Thu, Mar 24, 2016 at 4:30 PM, Kevin Ross  wrote:

> Thanks, Mike. When running tcpdump on the VM I'm not seeing traffic
> unless it's explicitly intended for that particular VM, so no traffic
> between the other VMs is getting forwarded from the virtual interface
> to the "network appliance" VM.
>
> There is connectivity between the VMs on the private network and the
> "network appliance" VM which is acting as a gateway.
>
> Here's the output of the brctl command:
>
> virbr1
>  bridge id  8000.5254007e2f5b
>  designated root8000.5254007e2f5b
>  root port 0path cost
> 0
>  max age  19.99 bridge max age
> 19.99
>  hello time1.99 bridge hello time
> 1.99
>  forward delay 0.00 bridge forward delay
>  0.00
>  ageing time 299.95
>  hello timer   0.29 tcn timer
> 0.00
>  topology change timer 0.00 gc timer
>  0.29
>  hash elasticity   4hash max
>  512
>  mc last member count  2mc init query count
> 2
>  mc router 1mc snooping
> 1
>  mc last member timer  0.99 mc membership timer
> 259.96
>  mc querier timer254.96 mc query interval
> 124.98
>  mc response interval  9.99 mc init query interval
> 31.24
>  flags
>
>
> virbr1-nic (0)
>  port idstate
> disabled
>  designated root8000.5254007e2f5b   path cost
> 100
>  designated bridge  8000.5254007e2f5b   message age timer
> 0.00
>  designated port8001forward delay timer
> 0.00
>  designated cost   0hold timer
>  0.00
>  mc router 1
>  flags
>
> I'm not sure why virbr1-nic is showing up as disabled, and also why
>

That STP output says the virbr1-nic interface is disabled -- maybe your VM
is powered off?


> the vnet# interfaces don't show up (they do show up on another host,
> although VMs on that host are having the same non-promiscuous issue as
> these VMs). I've tried this with and without NAT, as well as with STP
> on/off with no effect.
>

You'll need to enable IP forwarding and set rules to route the traffic for
those VMs.
http://www.linux-kvm.org/page/Networking#Routing_with_iptables

The gotcha is that if you're not doing any IP routing on the KVM node, your
"network appliance" VM needs to have one NIC bridged to your real network
and the other as part of virbr1. You could NAT it on the KVM host as well.

Read the KVM networking documentation as it will help you determine what
configuration you have and if that's what you want.

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Re: [CentOS-virt] KVM networking issue

[Kevin Ross]

Thanks, Mike. When running tcpdump on the VM I'm not seeing traffic
unless it's explicitly intended for that particular VM, so no traffic
between the other VMs is getting forwarded from the virtual interface
to the "network appliance" VM.

There is connectivity between the VMs on the private network and the
"network appliance" VM which is acting as a gateway.

Here's the output of the brctl command:

virbr1
 bridge id  8000.5254007e2f5b
 designated root8000.5254007e2f5b
 root port 0path cost  0
 max age  19.99 bridge max age19.99
 hello time1.99 bridge hello time  1.99
 forward delay 0.00 bridge forward delay   0.00
 ageing time 299.95
 hello timer   0.29 tcn timer  0.00
 topology change timer 0.00 gc timer   0.29
 hash elasticity   4hash max 512
 mc last member count  2mc init query count2
 mc router 1mc snooping1
 mc last member timer  0.99 mc membership timer  259.96
 mc querier timer254.96 mc query interval124.98
 mc response interval  9.99 mc init query interval31.24
 flags


virbr1-nic (0)
 port idstate  disabled
 designated root8000.5254007e2f5b   path cost100
 designated bridge  8000.5254007e2f5b   message age timer  0.00
 designated port8001forward delay timer0.00
 designated cost   0hold timer 0.00
 mc router 1
 flags

I'm not sure why virbr1-nic is showing up as disabled, and also why
the vnet# interfaces don't show up (they do show up on another host,
although VMs on that host are having the same non-promiscuous issue as
these VMs). I've tried this with and without NAT, as well as with STP
on/off with no effect.

Thanks,

Kevin
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Re: [CentOS-virt] KVM networking issue

[Mike - st257]

On Tue, Mar 22, 2016 at 1:57 PM, Kevin Ross  wrote:

> Hi Mike,
>
> Thanks for the info. I'd rather run monitoring such as tcpdump from
> the VM if possible and not the host as a simulation of a network
>

Then run tcpdump on the VM. Same command or commands you'd have ran on the
host node.


> appliance and with the intent eventually of giving others access to
> the VM and not the host. Here is the xml file for the private network:
>
> 
>
> 
>   virbr1
>   
>   
>   
>   
>   
>   
> 
>
> There are two VMs connected to this interface, and the monitoring or
> "appliance" VM is connected to both this and the external interface.


I take it you've tried testing basic connectivity from the VMs to whatever
default gateway is in place?

I see Spanning Tree is enabled, so you might check that an interface isn't
in the blocking state.
brctl showstp  | egrep '^(em|eth|vnet)|state'

I don't use the NAT network mode for KVM, so hopefully someone else can
chime in on that piece.

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Re: [CentOS-virt] KVM networking issue

[Kevin Ross]

Hi Mike,

Thanks for the info. I'd rather run monitoring such as tcpdump from
the VM if possible and not the host as a simulation of a network
appliance and with the intent eventually of giving others access to
the VM and not the host. Here is the xml file for the private network:




  virbr1
  
  
  
  
  
  


There are two VMs connected to this interface, and the monitoring or
"appliance" VM is connected to both this and the external interface.

Please let me know if I can provide more info that will be relevant.

Thanks,

Kevin

On Tue, Mar 22, 2016 at 9:41 AM, Mike - st257  wrote:
> On Mon, Mar 21, 2016 at 1:33 PM, Kevin Ross  wrote:
>>
>> Hi folks,
>>
>> I posted this question to the KVM list, but I thought I'd try here
>> too--sorry if this is the wrong place to post this, can you please
>> direct me to the correct forum or list if so, thanks!
>>
>> I'm working on a network security project, using KVM installed on
>> CentOS 6.7 through yum. I have a VM with the goal of using this as a
>> network appliance, and two other VMs, one simulating an attack node
>> and the other simulating a vulnerable webapp. These are all connected
>> to the same internal private network set up in KVM. The idea with the
>> network appliance VM is to have it act as if it's connected to a
>> network tap so it can see the traffic between the other two VMs. I'm
>> not able to see the traffic currently and would appreciate your help
>> or suggestions to see if this is possible and how I can set this up if
>
>
> From the KVM host you should be able to point tcpdump at the vnetX
> interfaces and sniff.
> I've had to do this on occasion (with a bridged network setup) when a web
> hosting VM was being brute forced.
>
>>
>> so. I came across some information online suggesting to have the
>> interfaces in promiscuous mode, including the virtual NIC for the
>> private network, and I've tried all combinations. Thanks for any help
>> you can offer!
>
>
> Start by determining what interface your VM is attached to.
>
> We have no idea the network layout of your KVM set up for VMs either.
> Look at the XML for your VM to determine which interface it's tied to.
>
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>
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Re: [CentOS-virt] KVM networking issue

[Mike - st257]

On Mon, Mar 21, 2016 at 1:33 PM, Kevin Ross  wrote:

> Hi folks,
>
> I posted this question to the KVM list, but I thought I'd try here
> too--sorry if this is the wrong place to post this, can you please
> direct me to the correct forum or list if so, thanks!
>
> I'm working on a network security project, using KVM installed on
> CentOS 6.7 through yum. I have a VM with the goal of using this as a
> network appliance, and two other VMs, one simulating an attack node
> and the other simulating a vulnerable webapp. These are all connected
> to the same internal private network set up in KVM. The idea with the
> network appliance VM is to have it act as if it's connected to a
> network tap so it can see the traffic between the other two VMs. I'm
> not able to see the traffic currently and would appreciate your help
> or suggestions to see if this is possible and how I can set this up if
>

>From the KVM host you should be able to point tcpdump at the vnetX
interfaces and sniff.
I've had to do this on occasion (with a bridged network setup) when a web
hosting VM was being brute forced.


> so. I came across some information online suggesting to have the
> interfaces in promiscuous mode, including the virtual NIC for the
> private network, and I've tried all combinations. Thanks for any help
> you can offer!
>

Start by determining what interface your VM is attached to.

We have no idea the network layout of your KVM set up for VMs either.
Look at the XML for your VM to determine which interface it's tied to.

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[CentOS-virt] KVM networking issue

[Kevin Ross]

Hi folks,

I posted this question to the KVM list, but I thought I'd try here
too--sorry if this is the wrong place to post this, can you please
direct me to the correct forum or list if so, thanks!

I'm working on a network security project, using KVM installed on
CentOS 6.7 through yum. I have a VM with the goal of using this as a
network appliance, and two other VMs, one simulating an attack node
and the other simulating a vulnerable webapp. These are all connected
to the same internal private network set up in KVM. The idea with the
network appliance VM is to have it act as if it's connected to a
network tap so it can see the traffic between the other two VMs. I'm
not able to see the traffic currently and would appreciate your help
or suggestions to see if this is possible and how I can set this up if
so. I came across some information online suggesting to have the
interfaces in promiscuous mode, including the virtual NIC for the
private network, and I've tried all combinations. Thanks for any help
you can offer!

Thanks,

Kevin
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Re: [CentOS-virt] KVM

[Gokan Atmaca]

>>> If you run top what are you seeing on the %Cpu(s) line?
http://i.hizliresim.com/NrmV9Y.png


On Mon, Feb 8, 2016 at 10:53 PM, Alvin Starr  wrote:
> You need to provide more information.
> 20% is what number.
> There are something like 6 numbers on that line.
>
>
> On 02/08/2016 02:56 PM, Gokan Atmaca wrote:
>>>
>>> If you run top what are you seeing on the %Cpu(s) line?
>>
>> %20
>>
>>
>> On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr  wrote:
>>>
>>> Slow disks will show up as higher I/Owait times.
>>> If your seeing 99% cpu usage then your likely looking at some other
>>> problem.
>>>
>>> If you run top what are you seeing on the %Cpu(s) line?
>>>
>>>
>>> On 02/08/2016 02:20 PM, Gokan Atmaca wrote:
>
> I'm guessing you're using standard 7,200rpm platter drives? You'll need
> to share more information about your environment in order for us to
> provide useful feedback. Usually though, the answer is 'caching' and/or
> 'faster disks'.

 Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a
 preference for slightly more capacity.
 Unfortunately very expensive SAS drives.  But this works only if the
 server in question occur.
 In this case, about 15 minutes. progress.


 On Mon, Feb 8, 2016 at 9:13 PM, Digimer  wrote:
>
> On 08/02/16 02:12 PM, Gokan Atmaca wrote:
>>
>> Hello
>>
>> I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
>> increases. It consumes up to 99%. For this reason, slowing down the
>> other virtual machine. What should I do to solve the problem. ?
>>
>> Thanks..
>
> I'm guessing you're using standard 7,200rpm platter drives? You'll need
> to share more information about your environment in order for us to
> provide useful feedback. Usually though, the answer is 'caching' and/or
> 'faster disks'.
>
> --
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without
> access to education?
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>>>
>>>
>>>
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Re: [CentOS-virt] KVM

[Alexander Dalloz]

Am 08.02.2016 um 22:25 schrieb Gokan Atmaca:

If you run top what are you seeing on the %Cpu(s) line?

http://i.hizliresim.com/NrmV9Y.png


That's not a CentOS system. You should probably consult the community 
providing support for your Debian or Ubuntu based system.


I see you run MySQL, so verify your database configuration against the 
discussion at


https://serverfault.com/questions/363355/io-wait-causing-so-much-slowdown-ext4-jdb2-at-99-io-during-mysql-commit

Alexander

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Re: [CentOS-virt] KVM

[Gokan Atmaca]

> If you run top what are you seeing on the %Cpu(s) line?

%20


On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr  wrote:
> Slow disks will show up as higher I/Owait times.
> If your seeing 99% cpu usage then your likely looking at some other problem.
>
> If you run top what are you seeing on the %Cpu(s) line?
>
>
> On 02/08/2016 02:20 PM, Gokan Atmaca wrote:
>>>
>>> I'm guessing you're using standard 7,200rpm platter drives? You'll need
>>> to share more information about your environment in order for us to
>>> provide useful feedback. Usually though, the answer is 'caching' and/or
>>> 'faster disks'.
>>
>> Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a
>> preference for slightly more capacity.
>> Unfortunately very expensive SAS drives.  But this works only if the
>> server in question occur.
>> In this case, about 15 minutes. progress.
>>
>>
>> On Mon, Feb 8, 2016 at 9:13 PM, Digimer  wrote:
>>>
>>> On 08/02/16 02:12 PM, Gokan Atmaca wrote:

 Hello

 I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
 increases. It consumes up to 99%. For this reason, slowing down the
 other virtual machine. What should I do to solve the problem. ?

 Thanks..
>>>
>>> I'm guessing you're using standard 7,200rpm platter drives? You'll need
>>> to share more information about your environment in order for us to
>>> provide useful feedback. Usually though, the answer is 'caching' and/or
>>> 'faster disks'.
>>>
>>> --
>>> Digimer
>>> Papers and Projects: https://alteeve.ca/w/
>>> What if the cure for cancer is trapped in the mind of a person without
>>> access to education?
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>>
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>
>
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Re: [CentOS-virt] KVM

[Alvin Starr]

You need to provide more information.
20% is what number.
There are something like 6 numbers on that line.

On 02/08/2016 02:56 PM, Gokan Atmaca wrote:

If you run top what are you seeing on the %Cpu(s) line?

%20


On Mon, Feb 8, 2016 at 9:30 PM, Alvin Starr  wrote:

Slow disks will show up as higher I/Owait times.
If your seeing 99% cpu usage then your likely looking at some other problem.

If you run top what are you seeing on the %Cpu(s) line?


On 02/08/2016 02:20 PM, Gokan Atmaca wrote:

I'm guessing you're using standard 7,200rpm platter drives? You'll need
to share more information about your environment in order for us to
provide useful feedback. Usually though, the answer is 'caching' and/or
'faster disks'.

Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a
preference for slightly more capacity.
Unfortunately very expensive SAS drives.  But this works only if the
server in question occur.
In this case, about 15 minutes. progress.


On Mon, Feb 8, 2016 at 9:13 PM, Digimer  wrote:

On 08/02/16 02:12 PM, Gokan Atmaca wrote:

Hello

I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
increases. It consumes up to 99%. For this reason, slowing down the
other virtual machine. What should I do to solve the problem. ?

Thanks..

I'm guessing you're using standard 7,200rpm platter drives? You'll need
to share more information about your environment in order for us to
provide useful feedback. Usually though, the answer is 'caching' and/or
'faster disks'.

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Re: [CentOS-virt] KVM

[NightLightHosts Admin]

On Mon, Feb 8, 2016 at 2:53 PM, Alvin Starr  wrote:
> You need to provide more information.
> 20% is what number.
> There are something like 6 numbers on that line.
>
>

Post commands and results of command outputs
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Re: [CentOS-virt] KVM

[Gokan Atmaca]

> Are the disk partitions properly aligned to 4k boundary on the host (and in
> the guests too) ?
>
There are 5 in total server. 32G ram. 2T r1 (soft) disk.


On Mon, Feb 8, 2016 at 9:41 PM, Zoltan Frombach  wrote:
> Are the disk partitions properly aligned to 4k boundary on the host (and in
> the guests too) ?
>
> See
> http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.html
> and this:
> http://unix.stackexchange.com/questions/247387/check-if-partitions-are-aligned-properly-for-performance
>
>
> On 2/8/2016 8:12 PM, Gokan Atmaca wrote:
>>
>> Hello
>>
>> I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
>> increases. It consumes up to 99%. For this reason, slowing down the
>> other virtual machine. What should I do to solve the problem. ?
>>
>> Thanks..
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Re: [CentOS-virt] KVM

[Digimer]

On 08/02/16 02:20 PM, Gokan Atmaca wrote:
>> I'm guessing you're using standard 7,200rpm platter drives? You'll need
>> to share more information about your environment in order for us to
>> provide useful feedback. Usually though, the answer is 'caching' and/or
>> 'faster disks'.
> 
> Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a
> preference for slightly more capacity.

Those are slow and have poor seek latency. Slow-down of other servers
when one hits the disk hard has to be expected.

> Unfortunately very expensive SAS drives.  But this works only if the
> server in question occur.
> In this case, about 15 minutes. progress.

I don't understand what you are saying/asking, sorry.

> On Mon, Feb 8, 2016 at 9:13 PM, Digimer  wrote:
>> On 08/02/16 02:12 PM, Gokan Atmaca wrote:
>>> Hello
>>>
>>> I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
>>> increases. It consumes up to 99%. For this reason, slowing down the
>>> other virtual machine. What should I do to solve the problem. ?
>>>
>>> Thanks..
>>
>> I'm guessing you're using standard 7,200rpm platter drives? You'll need
>> to share more information about your environment in order for us to
>> provide useful feedback. Usually though, the answer is 'caching' and/or
>> 'faster disks'.
>>
>> --
>> Digimer
>> Papers and Projects: https://alteeve.ca/w/
>> What if the cure for cancer is trapped in the mind of a person without
>> access to education?
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Re: [CentOS-virt] KVM

[Zoltan Frombach]

Are the disk partitions properly aligned to 4k boundary on the host (and 
in the guests too) ?


See
http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.html
and this:
http://unix.stackexchange.com/questions/247387/check-if-partitions-are-aligned-properly-for-performance

On 2/8/2016 8:12 PM, Gokan Atmaca wrote:

Hello

I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
increases. It consumes up to 99%. For this reason, slowing down the
other virtual machine. What should I do to solve the problem. ?

Thanks..
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Re: [CentOS-virt] KVM

[Digimer]

On 08/02/16 02:12 PM, Gokan Atmaca wrote:
> Hello
> 
> I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
> increases. It consumes up to 99%. For this reason, slowing down the
> other virtual machine. What should I do to solve the problem. ?
> 
> Thanks..

I'm guessing you're using standard 7,200rpm platter drives? You'll need
to share more information about your environment in order for us to
provide useful feedback. Usually though, the answer is 'caching' and/or
'faster disks'.

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Re: [CentOS-virt] KVM

[Gokan Atmaca]

> I'm guessing you're using standard 7,200rpm platter drives? You'll need
> to share more information about your environment in order for us to
> provide useful feedback. Usually though, the answer is 'caching' and/or
> 'faster disks'.

Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a
preference for slightly more capacity.
Unfortunately very expensive SAS drives.  But this works only if the
server in question occur.
In this case, about 15 minutes. progress.


On Mon, Feb 8, 2016 at 9:13 PM, Digimer  wrote:
> On 08/02/16 02:12 PM, Gokan Atmaca wrote:
>> Hello
>>
>> I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
>> increases. It consumes up to 99%. For this reason, slowing down the
>> other virtual machine. What should I do to solve the problem. ?
>>
>> Thanks..
>
> I'm guessing you're using standard 7,200rpm platter drives? You'll need
> to share more information about your environment in order for us to
> provide useful feedback. Usually though, the answer is 'caching' and/or
> 'faster disks'.
>
> --
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without
> access to education?
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[CentOS-virt] KVM

[Gokan Atmaca]

Hello

I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
increases. It consumes up to 99%. For this reason, slowing down the
other virtual machine. What should I do to solve the problem. ?

Thanks..
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Re: [CentOS-virt] KVM

[Alvin Starr]

Slow disks will show up as higher I/Owait times.
If your seeing 99% cpu usage then your likely looking at some other problem.

If you run top what are you seeing on the %Cpu(s) line?

On 02/08/2016 02:20 PM, Gokan Atmaca wrote:

I'm guessing you're using standard 7,200rpm platter drives? You'll need
to share more information about your environment in order for us to
provide useful feedback. Usually though, the answer is 'caching' and/or
'faster disks'.

Yes , 7.2k rpm disks. 2T mirror (soft). In fact, I had such a
preference for slightly more capacity.
Unfortunately very expensive SAS drives.  But this works only if the
server in question occur.
In this case, about 15 minutes. progress.


On Mon, Feb 8, 2016 at 9:13 PM, Digimer  wrote:

On 08/02/16 02:12 PM, Gokan Atmaca wrote:

Hello

I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
increases. It consumes up to 99%. For this reason, slowing down the
other virtual machine. What should I do to solve the problem. ?

Thanks..

I'm guessing you're using standard 7,200rpm platter drives? You'll need
to share more information about your environment in order for us to
provide useful feedback. Usually though, the answer is 'caching' and/or
'faster disks'.

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Re: [CentOS-virt] KVM

[Marcin Figura]

Using *top *and looki at *'wa' *value can tell you I/O wait time for each
CPU
Dont forget to press "*1*" to expand list of CPUs

Tasks: 501 total,   4 running, 497 sleeping,   0 stopped,   0 zombie
Cpu0  : 31.9%us, 52.7%sy,  0.0%ni, 15.1%id,  *0.0%wa*,  0.0%hi,  0.3%si,
 0.0%st
Cpu1  : 29.7%us,  7.6%sy,  0.0%ni, 62.1%id,  *0.0%wa,*  0.0%hi,  0.7%si,
 0.0%st

Also, there is handy tool called: *iotop *which can tell how much process
writes and read. We can see on our 6Gpbs SATAIII interface with SSD disks,
the interfaces is being maxed out with writes at ~500MBs

At the end 7.2k disks can be easily maxed out while running a few VMs so no
surprise here.

Lastly, setup some monitoring for example munin, its quite handy :

http://demo.munin-monitoring.org/disk-day.html



On Mon, Feb 8, 2016 at 1:58 PM Gokan Atmaca  wrote:

> > Are the disk partitions properly aligned to 4k boundary on the host (and
> in
> > the guests too) ?
> >
> There are 5 in total server. 32G ram. 2T r1 (soft) disk.
>
>
> On Mon, Feb 8, 2016 at 9:41 PM, Zoltan Frombach 
> wrote:
> > Are the disk partitions properly aligned to 4k boundary on the host (and
> in
> > the guests too) ?
> >
> > See
> >
> http://www.ibm.com/developerworks/library/l-linux-on-4kb-sector-disks/index.html
> > and this:
> >
> http://unix.stackexchange.com/questions/247387/check-if-partitions-are-aligned-properly-for-performance
> >
> >
> > On 2/8/2016 8:12 PM, Gokan Atmaca wrote:
> >>
> >> Hello
> >>
> >> I use KVM. In a virtual machine "jbd2 dm-0" disk I / O is very
> >> increases. It consumes up to 99%. For this reason, slowing down the
> >> other virtual machine. What should I do to solve the problem. ?
> >>
> >> Thanks..
> >> ___
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> >> https://lists.centos.org/mailman/listinfo/centos-virt
> >
> >
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Re: [CentOS-virt] kvm-qemu-ev in testing

[Gena Makhomed]

On 30.11.2015 19:02, Jean-Marc LIGER wrote:


Is it possible to add patch
https://bugzilla.redhat.com/show_bug.cgi?id=1248758
into qemu-kvm-ev from Red Hat, oVirt and cbs/centos ?



Could you rediff this patch for qemu-kvm-ev 2.3.0 series ?


I am already wasting too many time for this patch...

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Re: [CentOS-virt] kvm-qemu-ev in testing

[Jean-Marc LIGER]

Le 31/10/2015 01:52, Gena Makhomed a écrit :

On 29.10.2015 0:00, Sandro Bonazzola wrote:


it will be in http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/
enabled by
http://mirror.centos.org/centos/7/extras/x86_64/Packages/centos-release-qemu-ev-1.0-1.el7.noarch.rpm 



Is it possible to add patch
https://bugzilla.redhat.com/show_bug.cgi?id=1248758
into qemu-kvm-ev from Red Hat, oVirt and cbs/centos ?

Rebuilding each qemu-kvm-ev from sources is just wasting of time.



Hy,

Could you rediff this patch for qemu-kvm-ev 2.3.0 series ?

JML
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Re: [CentOS-virt] kvm-qemu-ev in testing

[Gena Makhomed]

On 29.10.2015 0:00, Sandro Bonazzola wrote:


it will be in http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/
enabled by
http://mirror.centos.org/centos/7/extras/x86_64/Packages/centos-release-qemu-ev-1.0-1.el7.noarch.rpm


Is it possible to add patch
https://bugzilla.redhat.com/show_bug.cgi?id=1248758
into qemu-kvm-ev from Red Hat, oVirt and cbs/centos ?

Rebuilding each qemu-kvm-ev from sources is just wasting of time.

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Re: [CentOS-virt] kvm-qemu-ev in testing

[Lamar Owen]

On 10/07/2015 07:07 PM, Karanbir Singh wrote:

hi,

kvm-qemu-ev from virt7-kvm-common-release is now signed and available on
buildlogs.centos.org for testing, the corresponding release file is
available in the centos/7/extras/ location on buildlogs as well.


Works here as a drop-in replacement for the 'regular' qemu-kvm packages 
running Windows 7 as a guest.  I am still looking forward to seeing what 
the '-ev' packages bring to the table over the regular qemu-kvm 
packages, but Win7 seems a bit more responsive under '-ev' than under 
the regular packages.


I actually rebuilt from the latest .src.rpm on cbs rather than using the 
pre-built ones, but am looking forward to following this.


In what repo will the '-ev' packages reside for update purposes?

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Re: [CentOS-virt] kvm-qemu-ev in testing

[Lamar Owen]

On 10/28/2015 06:00 PM, Sandro Bonazzola wrote:



On Wed, Oct 28, 2015 at 5:29 PM, Lamar Owen > wrote:



In what repo will the '-ev' packages reside for update purposes?



it will be in 
http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/ enabled by 
http://mirror.centos.org/centos/7/extras/x86_64/Packages/centos-release-qemu-ev-1.0-1.el7.noarch.rpm 




Thanks, Sandro.

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Re: [CentOS-virt] kvm-qemu-ev in testing

[Eliezer Croitoru]

May I ask what is the difference between the kvm-qemu package from Base 
CentOS 7 repo?


Thanks,
Eliezer

On 08/10/2015 02:07, Karanbir Singh wrote:

hi,

kvm-qemu-ev from virt7-kvm-common-release is now signed and available on
buildlogs.centos.org for testing, the corresponding release file is
available in the centos/7/extras/ location on buildlogs as well.

Once we have some testing, we can push and announce via
mirror.centos.org for wider adoption.

Regards,



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Re: [CentOS-virt] kvm-qemu-ev in testing

[Nux!]

Eliezer,

>From what I could find on the internet, it's this:
Live Snapshots
Live Storage Migration
Live Snapshot Merge
Block I/O Throttling
CEPH Enablement
OpenvSwitch

>From 
>https://rhsummit.files.wordpress.com/2014/04/sarathy_h_0945_red_hat_enterprise_virtualization_hypervisor.pdf

I'd love an answer with proper/current info as well. :-)

Lucian

--
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Nux!
www.nux.ro

- Original Message -
> From: "Eliezer Croitoru" <elie...@ngtech.co.il>
> To: centos-virt@centos.org
> Sent: Wednesday, 28 October, 2015 22:17:53
> Subject: Re: [CentOS-virt] kvm-qemu-ev in testing

> May I ask what is the difference between the kvm-qemu package from Base
> CentOS 7 repo?
> 
> Thanks,
> Eliezer
> 
> On 08/10/2015 02:07, Karanbir Singh wrote:
>> hi,
>>
>> kvm-qemu-ev from virt7-kvm-common-release is now signed and available on
>> buildlogs.centos.org for testing, the corresponding release file is
>> available in the centos/7/extras/ location on buildlogs as well.
>>
>> Once we have some testing, we can push and announce via
>> mirror.centos.org for wider adoption.
>>
>> Regards,
>>
> 
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Re: [CentOS-virt] kvm-qemu-ev in testing

[Sandro Bonazzola]

On Wed, Oct 28, 2015 at 5:29 PM, Lamar Owen  wrote:

> On 10/07/2015 07:07 PM, Karanbir Singh wrote:
>
>> hi,
>>
>> kvm-qemu-ev from virt7-kvm-common-release is now signed and available on
>> buildlogs.centos.org for testing, the corresponding release file is
>> available in the centos/7/extras/ location on buildlogs as well.
>>
>>
>> Works here as a drop-in replacement for the 'regular' qemu-kvm packages
> running Windows 7 as a guest.  I am still looking forward to seeing what
> the '-ev' packages bring to the table over the regular qemu-kvm packages,
> but Win7 seems a bit more responsive under '-ev' than under the regular
> packages.
>
> I actually rebuilt from the latest .src.rpm on cbs rather than using the
> pre-built ones, but am looking forward to following this.
>
> In what repo will the '-ev' packages reside for update purposes?



it will be in http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/
enabled by
http://mirror.centos.org/centos/7/extras/x86_64/Packages/centos-release-qemu-ev-1.0-1.el7.noarch.rpm




>
>
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Re: [CentOS-virt] kvm-qemu-ev in testing

[Sandro Bonazzola]

On Thu, Oct 8, 2015 at 1:07 AM, Karanbir Singh  wrote:

> hi,
>
> kvm-qemu-ev from virt7-kvm-common-release is now signed and available on
> buildlogs.centos.org for testing, the corresponding release file is
> available in the centos/7/extras/ location on buildlogs as well.
>
> Once we have some testing, we can push and announce via
> mirror.centos.org for wider adoption.
>

Works fine for me testing for basic operations at least.



>
> Regards,
>
> --
> Karanbir Singh
> +44-207-0999389 | http://www.karan.org/ | twitter.com/kbsingh
> GnuPG Key : http://www.karan.org/publickey.asc
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[CentOS-virt] kvm-qemu-ev in testing

[Karanbir Singh]

hi,

kvm-qemu-ev from virt7-kvm-common-release is now signed and available on
buildlogs.centos.org for testing, the corresponding release file is
available in the centos/7/extras/ location on buildlogs as well.

Once we have some testing, we can push and announce via
mirror.centos.org for wider adoption.

Regards,

-- 
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+44-207-0999389 | http://www.karan.org/ | twitter.com/kbsingh
GnuPG Key : http://www.karan.org/publickey.asc
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[CentOS-virt] Kvm intel dual gigabit ethernet nic pass thru.

[mechy2k2000]

Hello I am having a weird issue with a PCI-X Intel dual gigabit ethernet
nic. While I am partially successful in pass thru with kvm, I have a weird
issue with my pfsense freebsd vm.  It see the two nics but gives them the
same Mac address. I'm not sure if this is a pfsense bug or what.  The nic
works for everything but this Mac address issue.

Long story short, I guess what I'm asking is there any options I should use
when passing thru dual and quad Intel ethernetadapter right now I am
using

hostpci0: 1:00.0, driver=vfio

Thanks
Rafeal
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Re: [CentOS-virt] KVM and USB

[ToddAndMargo]

On 05/09/2015 01:46 AM, ToddAndMargo wrote:

Hi All,

On KVM, is there a way to pass USB Flash drives automatically
to the guest without having to go into virt-manager and
selecting the specific USB device?

-T





Here is great tutorial:
http://www.linux-kvm.org/page/USB_Host_Device_Assigned_to_Guest

Note that you can not map a USB 3 device



https://bugzilla.redhat.com/show_bug.cgi?id=1221471



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[CentOS-virt] KVM and USB

[ToddAndMargo]

Hi All,

On KVM, is there a way to pass USB Flash drives automatically
to the guest without having to go into virt-manager and
selecting the specific USB device?

-T

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Re: [CentOS-virt] kvm guest from zfs dataset

[Bill McGonigle]

On 01/15/2015 07:47 PM, aurfalien wrote:
 
 I’m trying to run a KVM based guest OS off of a mirrored ZFS dataset.
 
 It won’t run with errors invalid argument.., but will run when on the
 root volume, or when that ZFS dataset has been removed in favor of an
 EXT4 volumes.

KVM works fine on ZFS block devices.  I haven't tried running an image
file off of one (zvols are more appropriate to task).

Try (approximately, from memory):

 zfs create pool/machine
 zfs create -V 2G pool/machine/boot
 zfs create -V 64G pool/machine/root
 etc.

and in KVM, define the disks as physical devices:
 /dev/zvol/pool/machine/boot
and
 /dev/zvol/pool/machine/root
 (etc.)

I usually partition each 'disk' from within the VM, but you could
pre-partition from the host.  I like boot-part1 as ext3, for ultimate
portability back to older virtualization software (and it's just
'/boot', so who cares) on the off chance I have to move the VM at some
point.

If you're going to compress, do
  zfs set compress=lz4 pool/machine

for better performance (need a new-ish ZoL with feature-flags for this).

Setup zfs-auto-snapshot with --fast in the cron jobs for best performance.

If you're using whole-disk encryption, do those on the disks _before_
they're added to the pool.  I've been bitten by trying to encrypt on top
of the ZFS mirror before.  Put them in crypttab and you'll be all set at
boot time.  On newer Fedora-derived OS'es you'll need to 'systemctl
enable zfs.target' to get the ordering right.

-Bill

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Re: [CentOS-virt] kvm guest from zfs dataset

[George Dunlap]

On Fri, Jan 16, 2015 at 12:47 AM, aurfalien aurfal...@gmail.com wrote:
 Hi all,

 I thought I’d post this in case any one has issues similar to mine.

 First, my initial email to the list which I didn’t send;

 I’m trying to run a KVM based guest OS off of a mirrored ZFS dataset.

 It won’t run with errors invalid argument.., but will run when on the root
 volume, or when that ZFS dataset has been removed in favor of an EXT4
 volumes.

 Thanks in advance,

 PS I do see this thread which is not promising;

 http://www.redhat.com/archives/redhat-list/2014-July/msg00017.html

 Lastly, the solution;

 Set your cache policy on the KVM guest as write back.

 This allows it to run on a ZFS volume.

 My apology if this has been covered.  I did spend some time on this so
 hopefully you can save time by setting the cache policy.


The virt-manager / KVM angle is covered here:

https://github.com/zfsonlinux/zfs/issues/224

It looks like virt-manager asks for cached=none by default, which
causes qemu to pass the O_DIRECT flag when opening the file, which
ZFS doesn't support.

Be advised that if you use your work-around, you may be risking
problems with disk corruption unless your OS understands how to use
flush commands; see cached=writeback here:

https://www.suse.com/documentation/sles11/book_kvm/data/sect1_1_chapter_book_kvm.html

 -George
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[CentOS-virt] kvm guest from zfs dataset

[aurfalien]

Hi all,

I thought I’d post this in case any one has issues similar to mine.

First, my initial email to the list which I didn’t send;

I’m trying to run a KVM based guest OS off of a mirrored ZFS dataset.

It won’t run with errors invalid argument.., but will run when on the root 
volume, or when that ZFS dataset has been removed in favor of an EXT4 volumes.

Thanks in advance,

PS I do see this thread which is not promising;

http://www.redhat.com/archives/redhat-list/2014-July/msg00017.html

Lastly, the solution;

Set your cache policy on the KVM guest as write back.

This allows it to run on a ZFS volume.

My apology if this has been covered.  I did spend some time on this so 
hopefully you can save time by setting the cache policy.

- aurf

Janitorial Services

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Re: [CentOS-virt] KVM integrated network (user mode) dying after inactivity

[Arun Khan]

On Thu, Jun 5, 2014 at 12:10 AM, Timo Schöler t...@riscworks.net wrote:

 [root@fe00 ~]# brctl show
 bridge name bridge id   STP enabled interfaces
 br1 8000.001b21xx   yes eth1
 vnet1
 vnet3
 virbr0  8000.525400xx   yes virbr0-nic
 vnet0
 vnet2

Please share the config file that defines virbr0-nic  and virbr0

-- Arun Khan
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Re: [CentOS-virt] KVM integrated network (user mode) dying after inactivity

[Morris Jones]

Timo, I can confirm observing the same behavior. Your email thread here 
was very helpful in that it gave me two workarounds: (1) service 
libvirtd restart (2) make some background keepalive ping.

I'm hosting on a RHEL 6.4 system with similar version numbers:

[root@redpant centosimage]# rpm -qa|egrep '(virt|kvm)'
libvirt-python-0.10.2-18.el6_4.2.x86_64
libvirt-0.10.2-18.el6_4.2.x86_64
virt-manager-0.9.0-18.el6.x86_64
virt-viewer-0.5.2-18.el6_4.2.x86_64
virt-top-1.0.4-3.15.el6.x86_64
qemu-kvm-0.12.1.2-2.355.el6_4.2.x86_64
python-virtinst-0.600.0-15.el6.noarch
virt-what-1.11-1.2.el6.x86_64
virt-who-0.8-5.el6.noarch
libvirt-java-devel-0.4.9-1.el6.noarch
libvirt-devel-0.10.2-18.el6_4.2.x86_64
libvirt-client-0.10.2-18.el6_4.2.x86_64
libvirt-java-0.4.9-1.el6.noarch

Mojo
-- 
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Monrovia, CA
http://mojo.whiteoaks.com
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Re: [CentOS-virt] KVM integrated network (user mode) dying after inactivity

[George Dunlap]

On Wed, Jun 4, 2014 at 7:40 PM, Timo Schöler t...@riscworks.net wrote:
 -BEGIN PGP SIGNED MESSAGE-
 Hash: SHA256

 Hi list,

 I searched the web for bug reports regarding this phenomenon I see on
 *multiple* machines of a customer, however, I didn't find an exact
 fit. So, I'd like to ask here whether anyone else has run into this.

 I have multiple CentOS 6 machines running using KVM to virtualize a
 bunch of machines on them (LVM-based).

 Software releases as following:

 [root@fe00 ~]# rpm -qa|egrep '(virt|kvm)'
 virt-viewer-0.5.6-8.el6_5.3.x86_64
 libvirt-python-0.10.2-29.el6_5.7.x86_64
 libvirt-client-0.10.2-29.el6_5.7.x86_64
 qemu-kvm-0.12.1.2-2.415.el6_5.8.x86_64
 libvirt-0.10.2-29.el6_5.7.x86_64
 python-virtinst-0.600.0-18.el6.noarch

 [root@fe00 ~]# uname -r
 2.6.32-431.17.1.el6.x86_64

 The VMs (here: two) have the default connection provided by KVM
 (heading to the internet) as well as a bridged interface to connect to
 a high performance backbone, where sensitive data is kept and
 bandwidth is an issue (or better, not :), on a second interface within
 the VMs:

 [root@fe00 ~]# brctl show
 bridge name bridge id   STP enabled interfaces
 br1 8000.001b21xx   yes eth1
 vnet1
 vnet3
 virbr0  8000.525400xx   yes virbr0-nic
 vnet0
 vnet2

 br1 is the interface connected to the backbone, virbr0 KVM's user mode
 network.

 After some time of inactivity on the virbr0 interface, from *within*
 the VMs connection is *lost*. The interface(s) lose their IP; running
 dhclient(8) is not of any use.

 To get the machine back onto track, ``service libvirtd restart'' has
 to be issued: Vanished iptables rules show up again. (This, in
 contrast to an Ubuntu document [0], fixes it without shutting the
 VM(s) down.) Starting dhclient(8) within the VMs gets connectivity back.

Have you verified that the iptables rules disappear?  That is:
* Initially, the NAT rule is present
* After inactivity, the NAT rule disappears
* After restarting libvirtd, the NAT rule re-appears?

 -George
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Re: [CentOS-virt] KVM integrated network (user mode) dying after inactivity

[Timo Schöler]

On 06/05/2014 12:37 PM, thus George Dunlap spake:
 On Wed, Jun 4, 2014 at 7:40 PM, Timo Schöler t...@riscworks.net 
 wrote:
 -BEGIN PGP SIGNED MESSAGE- Hash: SHA256
 
 Hi list,
 
 I searched the web for bug reports regarding this phenomenon I 
 see on *multiple* machines of a customer, however, I didn't find
  an exact fit. So, I'd like to ask here whether anyone else has 
 run into this.
 
 I have multiple CentOS 6 machines running using KVM to virtualize
 a bunch of machines on them (LVM-based).
 
 Software releases as following:
 
 [root@fe00 ~]# rpm -qa|egrep '(virt|kvm)' 
 virt-viewer-0.5.6-8.el6_5.3.x86_64 
 libvirt-python-0.10.2-29.el6_5.7.x86_64 
 libvirt-client-0.10.2-29.el6_5.7.x86_64 
 qemu-kvm-0.12.1.2-2.415.el6_5.8.x86_64 
 libvirt-0.10.2-29.el6_5.7.x86_64 
 python-virtinst-0.600.0-18.el6.noarch
 
 [root@fe00 ~]# uname -r 2.6.32-431.17.1.el6.x86_64
 
 The VMs (here: two) have the default connection provided by
 KVM (heading to the internet) as well as a bridged interface to 
 connect to a high performance backbone, where sensitive data is 
 kept and bandwidth is an issue (or better, not :), on a second 
 interface within the VMs:
 
 [root@fe00 ~]# brctl show bridge name bridge id STP enabled 
 interfaces br1 8000.001b21xx yes
 eth1 vnet1 vnet3 virbr0 8000.525400xx   yes virbr0-nic
 vnet0 vnet2
 
 br1 is the interface connected to the backbone, virbr0 KVM's user
 mode network.
 
 After some time of inactivity on the virbr0 interface, from 
 *within* the VMs connection is *lost*. The interface(s) lose 
 their IP; running dhclient(8) is not of any use.
 
 To get the machine back onto track, ``service libvirtd restart''
  has to be issued: Vanished iptables rules show up again. (This,
  in contrast to an Ubuntu document [0], fixes it without shutting
  the VM(s) down.) Starting dhclient(8) within the VMs gets 
 connectivity back.
 
 Have you verified that the iptables rules disappear?  That is: * 
 Initially, the NAT rule is present * After inactivity, the NAT rule
 disappears * After restarting libvirtd, the NAT rule re-appears?
 
 -George

Hi,

yes, it's exactly that way it happens.

Timo


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[CentOS-virt] KVM and DHCP

[James B. Byrne]

CentOS-6.5

We have a KVM guest running MS-WinV7pro.  This guest is joined to an Active
Directory Domain.  That domain provides DHCP to the members.  The KVM guest
does not obtain its IP from the domain but from the local host's qemu
hypervisor instead.

Is there anyway to get around this and have the guest MS-Win OS get its DHCP
from the same place as the rest of the domain members?


-- 
***  E-Mail is NOT a SECURE channel  ***
James B. Byrnemailto:byrn...@harte-lyne.ca
Harte  Lyne Limited  http://www.harte-lyne.ca
9 Brockley Drive  vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada  L8E 3C3

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[CentOS-virt] KVM - Network bridge issue - lots of overruns

[AemNet]

Hi everybody

  I've a very big network problem with some server running CentOS with 
KVM and some linux-like VMs on the top of it.
The vm's network is bridged with a physical dedicate NIC (an Intel 
PRO/1000) with 2.4.14-NAPI driver (but the problem persists with various 
versions of the driver) and the CentOS version is 6.4 (same problem with 
a 5.7 sever) with all the last updates.
Randomly I get a lots of overruns on the vnet device on the physical 
server ad obviously some packet were lost in the VM.

brctl show br1
bridge name bridge id   STP enabled interfaces
br1 8000.002655e7590d   no  eth3
 vnet1

ifconfig vnet1
vnet1 Link encap:Ethernet  HWaddr FE:54:00:BF:27:12
   inet6 addr: fe80::fc54:ff:febf:2712/64 Scope:Link
   UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
   RX packets:13358349859 errors:0 dropped:0 overruns:0 frame:0
   TX packets:21831525660 errors:0 dropped:0 overruns:1746068 
carrier:0
   collisions:0 txqueuelen:500
   RX bytes:5080769358430 (4.6 TiB)  TX bytes:16548002754111 
(15.0 TiB)


As you can see there are a huge numbers of overruns also if the physical 
NIC is dedicate solely to this VM and the network traffic is less than 
150Mbps.
The server is a quite new machine (HP DL120 G6) but I have the same 
problem on an old DL360 G5 (but this is running about 10 vms).
What can I do to solve the problem?
My idea was to use the KVM passthrough functionality for the network 
device, but this method isn't good for a server that runs more than 2 
vms as my 360G5...

Thanks
Beppe

PS sorry for my bad english
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[CentOS-virt] KVM, virtualized interface, dropped packets.

[Rafał Radecki]

Hi All.

I have currently a small problem to solve. I have a kvm virtual machine
which in output of
ifconfig eth0 | egrep 'RX packets|TX packets'
  RX packets:792681304 errors:0 dropped:560728 overruns:0 frame:0
  TX packets:716661674 errors:0 dropped:0 overruns:0 carrier:0
show dropped packets. I think that rx buffer is to small (no strange
messagess in dmesg) and would like to make it larger. But when I try a
solution from
http://www.scottalanmiller.com/linux/2011/06/20/working-with-nic-ring-buffers/
I get:
ethtool -g eth0
Ring parameters for eth0:
Cannot get device ring settings: Operation not supported

So what is the proper way to make rx buffers larger in this situation?

Best regards,
Rafal Radecki.
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Re: [CentOS-virt] KVM virtual machine and SAN storage with FC

[Thomas Göttgens]

Hi,

while i am using mysql_mmm myself, it does has ist quirks and tends to get
the odd node out of sync, especially if your run additional slaves connected
to the master-master setup. You might have a look at galera cluster which is
available standalone or as part of a special version of MariaDB. I have had
a good experience with it, although it's innoDB only for now. 

 There is Multiple-Master MySQL, which basically provides built-in
 election of the master node and interesting load factors to split the
 load, and uses a separate IP address for the master node. It works
 pretty well and is available in the mysql-mmm package from EPEL.

Regards, Thomas

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Re: [CentOS-virt] KVM virtual machine and SAN storage with FC

[Nico Kadel-Garcia]

On Sat, Jul 6, 2013 at 8:30 AM, Thomas Göttgens tgoettg...@gmail.com wrote:
 Hi,

 while i am using mysql_mmm myself, it does has ist quirks and tends to get
 the odd node out of sync, especially if your run additional slaves connected
 to the master-master setup. You might have a look at galera cluster which is
 available standalone or as part of a special version of MariaDB. I have had
 a good experience with it, although it's innoDB only for now.

Heh. For good reason. MyISAM is being deprecated, by a lot of
developers, for a lot of reasons. Keeping the transactions atomic is
apparently a *big* MyISAM problem, and exacerbated by clustering
software.

I am curious about the multiple slave problem you mention. If this is
a reasonable group to detail it, do tell!
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Re: [CentOS-virt] KVM virtual machine and SAN storage with FC

[Nico Kadel-Garcia]

On Thu, Jul 4, 2013 at 12:44 AM, denis bahati djbah...@yahoo.co.uk wrote:
 Hi Brett,

 On my plan is as follows:

 I have two machine (Server) that will host two VM each. One for database and
 one for application. Then the two machine will provide (Load Balance and
 High availability). My intention is that all application files and data file
 for the database should reside on the SAN storage for easy access and
 update.

Don't... do this. Two database clients writing to the same database
filesystem back ends, simultaneously, is an enormous source of excited
sounding flow charts and proposals which simply do not work and are
very, very likely to corrupt your database beyond recover. These
problems have been examined, for *decades* with shared home
directories and saved email and for high performance or clustered
databases that need to not have split brain skew, It Does Not Work.

Set up a proper database *cluster* with distinct back ends.

 Therefore the storage should be accessible to both VMs through mounting the
 SAN storage to the VMs. The connection between SAN storage and the servers
 is through Fiber Channel.

Survey says *bzzzt*. See above for databases. For shared storage, you
should really be using some sort of network based access to a
filesystem back end. NetApp and EMC spend *billions* in research
building high availability shared storage, and even they don't pull
stunts like this the last I looked. I can vaguely imagine one of the
hosts doing write access and the other having read-only access. But
really, most databases today support good clustering configurations
that avoid precisely these issues.

 I have seen somewhere talking about DM-Multipath but i dont know if this can
 help or the use of VT-d if can help. I will also appreciate if you provide
 some links to give me insight of how to do this.

Multipath does not mean multiple clients of the same hardware
storage. That's effectively like letting two kernels write to the
same actual disk at the same time, and it's quite dangerous.

Now, if you want each client to access their own fiber channel disk
resource, that should be workable. Even if you have to mount the fiber
channel resources on the KVM host, and make disk images for the KVM
guest, that should at least get you a testable resource. But the
normal approach is have a fiber channel storage server that makes disk
images available via NFS, so that the guest VM's can be migrated from
one server to another with the shared storage more safely.
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[CentOS-virt] KVM virtual machine and SAN storage with FC

[denis bahati]

Hi Team,

Thanks for the good explanation. 

If that is not workable for the database, can anyone recommend me for the setup 
of the database clients and data files in order to achieve HA and load 
balancing? How should I set up my VMs and stations (Two machines with two VMs 
each)? I will appreciate for a workable approach and that is practical for the 
HA/Load balancing.

Regards



 From: Nico Kadel-Garcia nka...@gmail.com
To: denis bahati djbah...@yahoo.co.uk; Discussion about the virtualization 
on CentOS centos-virt@centos.org 
Cc: br...@worth.id.au br...@worth.id.au 
Sent: Thursday, 4 July 2013, 18:32
Subject: Re: [CentOS-virt] KVM virtual machine and SAN storage with FC
 

On Thu, Jul 4, 2013 at 12:44 AM, denis bahati djbah...@yahoo.co.uk wrote:
 Hi Brett,

 On my plan is as follows:

 I have two machine (Server) that will host two VM each. One for database and
 one for application. Then the two machine will provide (Load Balance and
 High availability). My intention is that all application files and data file
 for the database should reside on the SAN storage for easy access and
 update.

Don't... do this. Two database clients writing to the same database
filesystem back ends, simultaneously, is an enormous source of excited
sounding flow charts and proposals which simply do not work and are
very, very likely to corrupt your database beyond recover. These
problems have been examined, for *decades* with shared home
directories and saved email and for high performance or clustered
databases that need to not have split brain skew, It Does Not Work.

Set up a proper database *cluster* with distinct back ends.

 Therefore the storage should be accessible to both VMs through mounting the
 SAN storage to the VMs. The connection between SAN storage and the servers
 is through Fiber Channel.

Survey says *bzzzt*. See above for databases. For shared storage, you
should really be using some sort of network based access to a
filesystem back end. NetApp and EMC spend *billions* in research
building high availability shared storage, and even they don't pull
stunts like this the last I looked. I can vaguely imagine one of the
hosts doing write access and the other having read-only access. But
really, most databases today support good clustering configurations
that avoid precisely these issues.

 I have seen somewhere talking about DM-Multipath but i dont know if this can
 help or the use of VT-d if can help. I will also appreciate if you provide
 some links to give me insight of how to do this.

Multipath does not mean multiple clients of the same hardware
storage. That's effectively like letting two kernels write to the
same actual disk at the same time, and it's quite dangerous.

Now, if you want each client to access their own fiber channel disk
resource, that should be workable. Even if you have to mount the fiber
channel resources on the KVM host, and make disk images for the KVM
guest, that should at least get you a testable resource. But the
normal approach is have a fiber channel storage server that makes disk
images available via NFS, so that the guest VM's can be migrated from
one server to another with the shared storage more safely.


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Re: [CentOS-virt] KVM virtual machine and SAN storage with FC

[denis bahati]

Hi Brett,

On my plan is as follows:

I have two machine (Server) that will host two VM each. One for database and 
one for application. Then the two machine will provide (Load Balance and High 
availability). My intention is that all application files and data file for the 
database should reside on the SAN storage for easy access and update.

Therefore the storage should be accessible to both VMs through mounting the SAN 
storage to the VMs. The connection between SAN storage and the servers is 
through Fiber Channel.

I have seen somewhere talking about DM-Multipath but i dont know if this can 
help or the use of VT-d if can help. I will also appreciate if you provide some 
links to give me insight of how to do this.

If you need more information, please let me know.

Regards
 


 From: Brett Worth brett.wo...@gmail.com
To: denis bahati djbah...@yahoo.co.uk; Discussion about the virtualization 
on CentOS centos-virt@centos.org 
Sent: Wednesday, 3 July 2013, 8:40
Subject: Re: [CentOS-virt] KVM virtual machine and SAN storage with FC
 


On 03/07/13 15:22, denis bahati wrote:

Is there any body got any experience on setting up a virtualized environment 
in which the vm's can access a fiber channel SAN storage connected to host? 
the host access the SAN through its own HBA, but the hba is not recognized 
inside the virtual machines. Please let me know the step to go through this.

How you use this storage depends on whether you plan to do migration
from one server to another.

If you're not going to be migrating then you can just allocate the
FC LUN to LVM volume group and carve off logical volumes for the KVM
VMs to use.  These can then have meaningful LVM names in
/dev/vg_(VG)/lv_(LV) that can be allocated to the VM. See
system-config-lvm.

If you're planning to migrate between machines then the LVM solution
is not going to work.  In that case then you might need to create
volumes on you FC controller that will be seen as individual
devices/luns on the host servers.  There is a consistent device name
that can be used that appears under /dev/disk/by-id. This will be
identical on any host servers that can see that volume.  This can be
allocated to the VM and will be consistent for a migration.  Using
this method requires careful management and meticulous documentation
of which LUNs have been allocated to which VM.  The lun ids are not
very user friendly.

We've also have good results with DRBD for times when you want to be
able to migrate between machines but do not have a SAN.  You have
to  allocate all the storage on each server but you gain by having a
sort of backup.

Finally, I can recommend convirt as a good system manager interface.


Regards
Brett


--  /) _ _ _/_/ / / /  _ _// /_)//= / / (_(_/()/ /// 

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[CentOS-virt] KVM virtual machine and SAN storage with FC

[denis bahati]

Hi Team,

Is there any body got any experience on setting up a virtualized environment in 
which the vm's can access a fiber channel SAN storage connected to host? the 
host access the SAN through its own HBA, but the hba is not recognized inside 
the virtual machines. Please let me know the step to go through this.


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Re: [CentOS-virt] KVM virtual machine and SAN storage with FC

[Brett Worth]

On 03/07/13 15:22, denis bahati wrote:
Is there any body got any experience on setting up a virtualized environment in which 
the vm's can access a fiber channel SAN storage connected to host? the host access the 
SAN through its own HBA, but the hba is not recognized inside the virtual machines. 
Please let me know the step to go through this.


How you use this storage depends on whether you plan to do migration from one server to 
another.


If you're not going to be migrating then you can just allocate the FC LUN to LVM volume 
group and carve off logical volumes for the KVM VMs to use.  These can then have 
meaningful LVM names in /dev/vg_(VG)/lv_(LV) that can be allocated to the VM. See 
system-config-lvm.


If you're planning to migrate between machines then the LVM solution is not going to 
work.  In that case then you might need to create volumes on you FC controller that will 
be seen as individual devices/luns on the host servers.  There is a consistent device name 
that can be used that appears under /dev/disk/by-id. This will be identical on any host 
servers that can see that volume.  This can be allocated to the VM and will be consistent 
for a migration.  Using this method requires careful management and meticulous 
documentation of which LUNs have been allocated to which VM.  The lun ids are not very 
user friendly.


We've also have good results with DRBD for times when you want to be able to migrate 
between machines but do not have a SAN.  You have to  allocate all the storage on each 
server but you gain by having a sort of backup.


Finally, I can recommend convirt as a good system manager interface.


Regards
Brett

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[CentOS-virt] KVM virtio block layer - is TRIM/DISCARD supported?

[Dmitry E. Mikhailov]

Hi,

One question please:

If I use SSD as a storage on a host machine, does KVM's virtio I/O layer
pass the TRIM/DISCARD commands to the SSD?

I guess the question would be twofold:
1) is TRIM supported/forwarded if only one LVM'ed partition of SSD is
forwarded?
2) is TRIM supported/forwarded if full SSD is forwarded (i.e. /dev/sdX)

-- 
Best regards,
Dmitry Mikhailov

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Re: [CentOS-virt] KVM virtio block layer - is TRIM/DISCARD supported?

[Nico Kadel-Garcia]

On Sat, Feb 2, 2013 at 5:12 AM, Dmitry E. Mikhailov
d.mikhai...@infocommunications.ru wrote:
 Hi,

 One question please:

 If I use SSD as a storage on a host machine, does KVM's virtio I/O layer
 pass the TRIM/DISCARD commands to the SSD?

Doesn't look like it, *yet*. That looks like it came out in the 2.6.33
kernels, the upstream vendor for CentOS has only gotten up to 2.6.32.
I wouldn't necessarily call it stable for production use until it's
been out for a while.


 I guess the question would be twofold:
 1) is TRIM supported/forwarded if only one LVM'ed partition of SSD is
 forwarded?
 2) is TRIM supported/forwarded if full SSD is forwarded (i.e. /dev/sdX)

See above.
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[CentOS-virt] kvm

[mattias]

i have installed kvm on centos 6
but how to run it
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Re: [CentOS-virt] kvm

[Scott Dowdle]

Mattias,

- Original Message -
 i have installed kvm on centos 6
 but how to run it
 i not use libvirt

There is a fine virtualization guide written by Red Hat so check that if you 
haven't.

Basically you DO want to use libvirt in so much as you use a client that uses 
it.  What client?  Like virt-manager and/or virsh.  Those should be the clues 
that you need.

TYL,
-- 
Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]
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Re: [CentOS-virt] KVM online backup images

[Rudi Servo]

I don't believe that Centoss yet capable of such feature, live backup is 
recent and FAIK its available on Fedora 17/18.

To workaround this issue I use DRBD and LVM snapshot.

This feature is a must have since it's capable to snapshot disk-only 
(ie. qcow2), making easier to rsync and copy a entire disk without 
having the hole storage allocated or having big lvm's back and forth.


Hope I helped

On 11/27/2012 07:45 AM, Andry Michaelidou wrote:

Hello to you all!

We are implementing here at the University KVM virtualization for our 
servers and services and i was wondering if anyone try to 
automatically backup images.
I am actually using logical volumes for the VM guests. All virtual 
clients are installed in their LVM logical volume. We are already use 
IBM TSM for backup as we used to when we had physical machines, ie 
install client in OS and manage files and data backup.
I want to have an image backup additional to files backup, but i want 
to take the image online, without pause or suspend the VM guests.
Did anyone try to create image backups online? What about 
http://wiki.qemu.org/Features/Livebackup?

Can you please advise?

--
Andry Michaelidou Papa | IT Systems Administrator|Department of 
Computer Science| University of Cyprus

Tel: +357.22.892734 | Fax: +357.22.8927231 | http://www.cs.ucy.ac.cy



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Re: [CentOS-virt] KVM online backup images

[Philip Durbin]

see also http://fedoraproject.org/wiki/Features/Virt_Live_Snapshots#Live_backup 
and http://www.redhat.com/archives/libvir-list/2012-July/msg00782.html via 
http://irclog.perlgeek.de/crimsonfu/2012-10-24

On Nov 27, 2012, at 6:23 AM, Rudi Servo rudise...@gmail.com wrote:

 I don't believe that Centoss yet capable of such feature, live backup is 
 recent and FAIK its available on Fedora 17/18.
 To workaround this issue I use DRBD and LVM snapshot.
 
 This feature is a must have since it's capable to snapshot disk-only (ie. 
 qcow2), making easier to rsync and copy a entire disk without having the hole 
 storage allocated or having big lvm's back and forth.
 
 Hope I helped
 
 On 11/27/2012 07:45 AM, Andry Michaelidou wrote:
 Hello to you all!
 
 We are implementing here at the University KVM virtualization for our 
 servers and services and i was wondering if anyone try to automatically 
 backup images.
 I am actually using logical volumes for the VM guests. All virtual clients 
 are installed in their LVM logical volume. We are already use IBM TSM for 
 backup as we used to when we had physical machines, ie install client in OS 
 and manage files and data backup.
 I want to have an image backup additional to files backup, but i want to 
 take the image online, without pause or suspend the VM guests.
 Did anyone try to create image backups online? What about 
 http://wiki.qemu.org/Features/Livebackup? 
 Can you please advise? 
 --
 Andry Michaelidou Papa | IT Systems Administrator |Department of Computer 
 Science | University of Cyprus 
 Tel: +357.22.892734 | Fax: +357.22.8927231 | http://www.cs.ucy.ac.cy
 
 
 
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Re: [CentOS-virt] KVM online backup images

[Andry Michaelidou]

Dear Rudi Servo,

So you actually have to power off VM guest to take the LVM snapshot and 
then synchronize the disk with DRDB.
Do you automated this procedure using a cronjob or anything similar? Did 
you restore an image with success?


Thank you all,

--
Andry Michaelidou Papa | IT Systems Administrator|Department of Computer 
Science| University of Cyprus

Tel: +357.22.892734 | Fax: +357.22.8927231 | http://www.cs.ucy.ac.cy

On 27/11/2012 13:39, Philip Durbin wrote:
see also 
http://fedoraproject.org/wiki/Features/Virt_Live_Snapshots#Live_backup 
and http://www.redhat.com/archives/libvir-list/2012-July/msg00782.html 
via http://irclog.perlgeek.de/crimsonfu/2012-10-24


On Nov 27, 2012, at 6:23 AM, Rudi Servo rudise...@gmail.com 
mailto:rudise...@gmail.com wrote:


I don't believe that Centoss yet capable of such feature, live backup 
is recent and FAIK its available on Fedora 17/18.

To workaround this issue I use DRBD and LVM snapshot.

This feature is a must have since it's capable to snapshot disk-only 
(ie. qcow2), making easier to rsync and copy a entire disk without 
having the hole storage allocated or having big lvm's back and forth.


Hope I helped

On 11/27/2012 07:45 AM, Andry Michaelidou wrote:

Hello to you all!

We are implementing here at the University KVM virtualization for 
our servers and services and i was wondering if anyone try to 
automatically backup images.
I am actually using logical volumes for the VM guests. All virtual 
clients are installed in their LVM logical volume. We are already 
use IBM TSM for backup as we used to when we had physical machines, 
ie install client in OS and manage files and data backup.
I want to have an image backup additional to files backup, but i 
want to take the image online, without pause or suspend the VM guests.
Did anyone try to create image backups online? What about 
http://wiki.qemu.org/Features/Livebackup?

Can you please advise?

--
Andry Michaelidou Papa | IT Systems Administrator|Department of 
Computer Science| University of Cyprus

Tel: +357.22.892734 | Fax: +357.22.8927231 | http://www.cs.ucy.ac.cy



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Re: [CentOS-virt] KVM online backup images

[Rudi Servo]

I have DRBD to another machine, that means that the LVM is replicated 
over the network, you can stop the replication process of the LVM and do 
the snapshot on the Secondary Host Machine (No VM poweroff on the 
Primary Host), then restart DRBD sync.


Live snapshot is something I am planing to do in the next few days.

You can do it either way, but if Live snapshot is feasible, then just a 
cron job of snashot and backup will sufice, although I do recomend to 
use also corosync and pacemaker for fail-over and the backup job to be 
more of a service that you can shutdown if something goes wrong.


This is an ongoing project so I am still learning a lot in the process 
with the little time I have.


Sorry for not having all the testing done and information at the moment.



On 11/27/2012 10:50 AM, Andry Michaelidou wrote:

Dear Rudi Servo,

So you actually have to power off VM guest to take the LVM snapshot 
and then synchronize the disk with DRDB.
Do you automated this procedure using a cronjob or anything similar? 
Did you restore an image with success?


Thank you all,

--
Andry Michaelidou Papa | IT Systems Administrator|Department of 
Computer Science| University of Cyprus

Tel: +357.22.892734 | Fax: +357.22.8927231 | http://www.cs.ucy.ac.cy

On 27/11/2012 13:39, Philip Durbin wrote:
see also 
http://fedoraproject.org/wiki/Features/Virt_Live_Snapshots#Live_backup and 
http://www.redhat.com/archives/libvir-list/2012-July/msg00782.html 
via http://irclog.perlgeek.de/crimsonfu/2012-10-24


On Nov 27, 2012, at 6:23 AM, Rudi Servo rudise...@gmail.com 
mailto:rudise...@gmail.com wrote:


I don't believe that Centoss yet capable of such feature, live 
backup is recent and FAIK its available on Fedora 17/18.

To workaround this issue I use DRBD and LVM snapshot.

This feature is a must have since it's capable to snapshot disk-only 
(ie. qcow2), making easier to rsync and copy a entire disk without 
having the hole storage allocated or having big lvm's back and forth.


Hope I helped

On 11/27/2012 07:45 AM, Andry Michaelidou wrote:

Hello to you all!

We are implementing here at the University KVM virtualization for 
our servers and services and i was wondering if anyone try to 
automatically backup images.
I am actually using logical volumes for the VM guests. All virtual 
clients are installed in their LVM logical volume. We are already 
use IBM TSM for backup as we used to when we had physical machines, 
ie install client in OS and manage files and data backup.
I want to have an image backup additional to files backup, but i 
want to take the image online, without pause or suspend the VM guests.
Did anyone try to create image backups online? What about 
http://wiki.qemu.org/Features/Livebackup?

Can you please advise?

--
Andry Michaelidou Papa | IT Systems Administrator|Department of 
Computer Science| University of Cyprus

Tel: +357.22.892734 | Fax: +357.22.8927231 | http://www.cs.ucy.ac.cy



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[CentOS-virt] KVM + virsh nodeinfo + CentOS 6.3

[Matthias Hensler]

Hi there,

today I encountered the very same problem as described by Zoltan. We are
running a system with the Intel serverboard S2600CP and two E5-2620 Xeon
processors, with a total of 2 x 6 Cores with 2 threads each (resulting
in a total CPU count of 24).

Base system is a CentOS 6.3 with all recent updates. We are running the
setup for some months now, without any problems. Most virtual machines
only got 4 vCPUs, but some got 6 or 8 vCPUs. That setup was fine if
running CentOS 5, CentOS 6 or Windows Server 2008 as guest systems.

However, today I had to install two machines with Debian Squeeze. The
first one got 4 vCPUs and runs fine, while the second one got 6 vCPUs
and does not boot at all. Booting stops shortly after detecting the
virtio harddisk with its partitions. When I switch back to 4 vCPUs
everything is fine.

Since the RHEL 5.8 and 6.3 kernels work fine, it seems to be a problem
specific to the Debian kernel.

Our default setup pins the different vCPUs to one fixed physical CPU
each in an interleaving way. This would be the setup from
/etc/libvirt/qemu/vm.xml:

  memory unit='KiB'12582912/memory
  currentMemory unit='KiB'12582912/currentMemory
  vcpu placement='static'6/vcpu
  cputune
vcpupin vcpu='0' cpuset='0-5,12-17'/
vcpupin vcpu='1' cpuset='6-11,18-23'/
vcpupin vcpu='2' cpuset='0-5,12-17'/
vcpupin vcpu='3' cpuset='6-11,18-23'/
vcpupin vcpu='4' cpuset='0-5,12-17'/
vcpupin vcpu='5' cpuset='6-11,18-23'/
  /cputune
  os
type arch='x86_64' machine='rhel6.3.0'hvm/type
boot dev='hd'/
  /os
  features
acpi/
apic/
pae/
  /features
  cpu mode='host-model'
model fallback='allow'/
topology sockets='6' cores='1' threads='1'/
  /cpu
  clock offset='utc'/
  on_poweroffdestroy/on_poweroff
  on_rebootrestart/on_reboot
  on_crashrestart/on_crash

Such a setup works fine for Redhat-kernels, but not for the Debian
kernel (did only test the default 2.6.32-5 amd64 kernel so far).

I played a bit with the pinning and topology, but even setting the
config to do no pinning at all, and for example use 8 vCPUs divided in 2
sockets with 4 cores, or 1 socket with 8 cores or any other combination
of it, does not work. The only way to get the Debian VM to boot, is to
roll back to a total of 4 vCPUs (or less).

As a reference, these are the cpuflags, seen from the host:
processor   : 23
vendor_id   : GenuineIntel
cpu family  : 6
model   : 45
model name  : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
stepping: 7
cpu MHz : 1995.156
cache size  : 15360 KB
physical id : 1
siblings: 12
core id : 5
cpu cores   : 6
apicid  : 43
initial apicid  : 43
fpu : yes
fpu_exception   : yes
cpuid level : 13
wp  : yes
flags   : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat 
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp 
lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf 
pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm dca 
sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts 
dts tpr_shadow vnmi flexpriority ept vpid
bogomips: 3989.83
clflush size: 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:

and these are the cpuflags seen from the guest:
processor   : 3
vendor_id   : GenuineIntel
cpu family  : 6
model   : 42
model name  : Intel Xeon E312xx (Sandy Bridge)
stepping: 1
cpu MHz : 1995.191
cache size  : 4096 KB
fpu : yes
fpu_exception   : yes
cpuid level : 13
wp  : yes
flags   : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat 
pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc arch_perfmon 
rep_good pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes xsave avx 
hypervisor lahf_lm
bogomips: 3990.38
clflush size: 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:

The host is running this kernel: 2.6.32-279.11.1.el6.x86_64 #1 SMP Tue Oct 16 
15:57:10 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Packages are up to date:
qemu-kvm-0.12.1.2-2.295.el6_3.2.x86_64
libvirt-0.9.10-21.el6_3.5.x86_64


The kvm commandline looks like this (for 4 vCPUs):
/usr/libexec/qemu-kvm -S -M rhel6.3.0 -cpu 
SandyBridge,+pdpe1gb,+osxsave,+tsc-deadline,+dca,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme
 -enable-kvm -m 12288 -smp 4,sockets=4,cores=1,threads=1 -name  -uuid 
---- -nodefconfig -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/xx.monitor,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown 
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive 

[CentOS-virt] KVM + virsh nodeinfo + CentOS 6.3

[Zoltan Frombach]

Hi,

Please let me know in case I am posting my question to the wrong forum. 
I apologize if that is the case!

Here is my question:

We run CentOS 6.3 on a server with dual Xeon CPU's. Our dual blade 
server uses this motherboard:
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRT-HF.cfm

We have two of these CPUs installed and working:
Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
( 
http://ark.intel.com/products/64594/Intel-Xeon-Processor-E5-2620-15M-Cache-2_00-GHz-7_20-GTs-Intel-QPI
 
)

cat /proc/cpuinfo correctly reports a total of 24 cores (2 x 6 phisycal 
cores plus 2 x 6 hyperthreading cores)

However, I get this output from virsh nodeinfo :

# virsh nodeinfo
CPU model:   x86_64
CPU(s):  24
CPU frequency:   2000 MHz
CPU socket(s):   1
Core(s) per socket:  6
Thread(s) per core:  2
NUMA cell(s):2
Memory size: 16303552 kB

As you can see, virsh nodeinfo reports only 1 CPU socket while in fact 
we have two CPU's.

I would like to know if this is normal? Why does virsh reports only one 
physical CPU ??

Also, when we try to run a guest OS (Debian Linux squeeze) with more 
than 4 vcpu's assigned to the VM, the guest OS won't boot up. The 
guest's kernel stuck on a screen right after it detected the /dev/vda 
block device and its partitions. We're using the VirtIO driver, of 
course. If I assign only 4 (or less) vcpu's to the guest OS it works 
fine. I have tried to upgrade the Linux kernel on the guest from debian 
backports, it did not help, we're experiencing the same issue with both 
the 2.6.32 and 3.2 Linux kernels. What could be causing this?

On the host, we use the Linux kernel that came with CentOS 6.3 :
2.6.32-279.11.1.el6.x86_64 #1 SMP Tue Oct 16 15:57:10 UTC 2012 x86_64 
x86_64 x86_64 GNU/Linux

Thanks,

Zoltan
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Re: [CentOS-virt] KVM + virsh nodeinfo + CentOS 6.3

[bertrand.louarg...@atoutlinux.net]

Hello,

You have a NUMA (Non Uniform Memory Access) machine, which mean that each
processor has its own memory controller.
virsh nodeinfo give you 2 NUMA cells with 1 CPU socket each: 2 NUMA cells x 1CPU
socket x 6 Core(s) per socket x 2 threads per core = 24 cores.

The NUMA concept is really important, especially  in virtualization.
If you have a virtual machine with vCPUs spread across more than one NUMA cell,
performances will drop drastically.

Maybe you cannot assign more than 4 cPUs to your VM because Libvirt cannot pin
them all on the same NUMA cell ...
You can try to specify the NUMA architecture in the xml config.

Br,
Bertrand.

Le 24 octobre 2012 à 17:14, Zoltan Frombach zol...@frombach.com a écrit :
 Hi,

 Please let me know in case I am posting my question to the wrong forum.
 I apologize if that is the case!

 Here is my question:

 We run CentOS 6.3 on a server with dual Xeon CPU's. Our dual blade
 server uses this motherboard:
 http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRT-HF.cfm

 We have two of these CPUs installed and working:
 Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
 (
 http://ark.intel.com/products/64594/Intel-Xeon-Processor-E5-2620-15M-Cache-2_00-GHz-7_20-GTs-Intel-QPI
 )

 cat /proc/cpuinfo correctly reports a total of 24 cores (2 x 6 phisycal
 cores plus 2 x 6 hyperthreading cores)

 However, I get this output from virsh nodeinfo :

 # virsh nodeinfo
 CPU model: x86_64
 CPU(s): 24
 CPU frequency: 2000 MHz
 CPU socket(s): 1
 Core(s) per socket: 6
 Thread(s) per core: 2
 NUMA cell(s): 2
 Memory size: 16303552 kB

 As you can see, virsh nodeinfo reports only 1 CPU socket while in fact
 we have two CPU's.

 I would like to know if this is normal? Why does virsh reports only one
 physical CPU ??

 Also, when we try to run a guest OS (Debian Linux squeeze) with more
 than 4 vcpu's assigned to the VM, the guest OS won't boot up. The
 guest's kernel stuck on a screen right after it detected the /dev/vda
 block device and its partitions. We're using the VirtIO driver, of
 course. If I assign only 4 (or less) vcpu's to the guest OS it works
 fine. I have tried to upgrade the Linux kernel on the guest from debian
 backports, it did not help, we're experiencing the same issue with both
 the 2.6.32 and 3.2 Linux kernels. What could be causing this?

 On the host, we use the Linux kernel that came with CentOS 6.3 :
 2.6.32-279.11.1.el6.x86_64 #1 SMP Tue Oct 16 15:57:10 UTC 2012 x86_64
 x86_64 x86_64 GNU/Linux

 Thanks,

 Zoltan
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Re: [CentOS-virt] KVM + virsh nodeinfo + CentOS 6.3

[Zoltan Frombach]

Thank you for your quick reply!

I understand the NUMA cell concept and I am using CPU pinning in the XML 
file. For example:


domain type='kvm'
  nameDebian-/name
  uuid/uuid
  memory unit='KiB'8388608/memory
  currentMemory unit='KiB'8388608/currentMemory
  vcpu placement='static' cpuset='6-9,18-21'8/vcpu
  os
type arch='x86_64' machine='rhel6.3.0'hvm/type
...
  /os
...

This guest still hangs while starting up its Linux Kernel (3.2.x.x) ... :(

Here is my virsh capabilities output from the host (CentOS 6.3):

# virsh capabilities
capabilities

  host
uuid00020003-0004-0005-0006-000700080009/uuid
cpu
  archx86_64/arch
  modelSandyBridge/model
  vendorIntel/vendor
  topology sockets='1' cores='6' threads='2'/
  feature name='pdpe1gb'/
  feature name='osxsave'/
  feature name='tsc-deadline'/
  feature name='dca'/
  feature name='pdcm'/
  feature name='xtpr'/
  feature name='tm2'/
  feature name='est'/
  feature name='smx'/
  feature name='vmx'/
  feature name='ds_cpl'/
  feature name='monitor'/
  feature name='dtes64'/
  feature name='pbe'/
  feature name='tm'/
  feature name='ht'/
  feature name='ss'/
  feature name='acpi'/
  feature name='ds'/
  feature name='vme'/
/cpu
power_management
  suspend_disk/
/power_management
migration_features
  live/
  uri_transports
uri_transporttcp/uri_transport
  /uri_transports
/migration_features
topology
  cells num='2'
cell id='0'
  cpus num='12'
cpu id='0'/
cpu id='1'/
cpu id='2'/
cpu id='3'/
cpu id='4'/
cpu id='5'/
cpu id='12'/
cpu id='13'/
cpu id='14'/
cpu id='15'/
cpu id='16'/
cpu id='17'/
  /cpus
/cell
cell id='1'
  cpus num='12'
cpu id='6'/
cpu id='7'/
cpu id='8'/
cpu id='9'/
cpu id='10'/
cpu id='11'/
cpu id='18'/
cpu id='19'/
cpu id='20'/
cpu id='21'/
cpu id='22'/
cpu id='23'/
  /cpus
/cell
  /cells
/topology
  /host

  guest
os_typehvm/os_type
arch name='i686'
  wordsize32/wordsize
  emulator/usr/libexec/qemu-kvm/emulator
  machinerhel6.3.0/machine
  machine canonical='rhel6.3.0'pc/machine
  machinerhel6.2.0/machine
  machinerhel6.1.0/machine
  machinerhel6.0.0/machine
  machinerhel5.5.0/machine
  machinerhel5.4.4/machine
  machinerhel5.4.0/machine
  domain type='qemu'
  /domain
  domain type='kvm'
emulator/usr/libexec/qemu-kvm/emulator
  /domain
/arch
features
  cpuselection/
  deviceboot/
  pae/
  nonpae/
  acpi default='on' toggle='yes'/
  apic default='on' toggle='no'/
/features
  /guest

  guest
os_typehvm/os_type
arch name='x86_64'
  wordsize64/wordsize
  emulator/usr/libexec/qemu-kvm/emulator
  machinerhel6.3.0/machine
  machine canonical='rhel6.3.0'pc/machine
  machinerhel6.2.0/machine
  machinerhel6.1.0/machine
  machinerhel6.0.0/machine
  machinerhel5.5.0/machine
  machinerhel5.4.4/machine
  machinerhel5.4.0/machine
  domain type='qemu'
  /domain
  domain type='kvm'
emulator/usr/libexec/qemu-kvm/emulator
  /domain
/arch
features
  cpuselection/
  deviceboot/
  acpi default='on' toggle='yes'/
  apic default='on' toggle='no'/
/features
  /guest

/capabilities

And the odd thing is this: virsh freecell only provides a total, not a 
per node list:


# virsh freecell
Total: 15891284 kB

According to this Fedora page
http://docs.fedoraproject.org/en-US/Fedora/13/html/Virtualization_Guide/ch25s06.html
I should see a per node list.

Anyway, my Debian guest still does not boot up when I assign more than 4 
vcpus to it. Even if I pin all cpus to the same NUMA node.


BTW, I have copied my host CPU's configuration and CPU features for my 
guests (using virt-manager GUI, running remotely on an Ubuntu desktop 
box). Maybe I should use some predefined CPU type instead of cloning CPU 
configuration from the host??


Zoltan

On 10/24/2012 5:58 PM, bertrand.louarg...@atoutlinux.net wrote:

Hello,
You have a NUMA (Non Uniform Memory Access) machine, which mean that 
each processor has its own memory controller.
virsh nodeinfo give you 2 NUMA cells with 1 CPU socket each: 2 NUMA 
cells x 1CPU socket x 6 Core(s) per socket x 2 threads per core = 24 
cores.

The NUMA concept is really important, especially  in virtualization.
If you have a virtual machine with vCPUs spread across more than one 
NUMA cell, performances will drop drastically.
Maybe you cannot assign more than 4 cPUs to your VM because Libvirt 
cannot pin them all on the same 

[CentOS-virt] KVM serial cards

[James B. Byrne]

I am returning to an old question and am investigating whether or not
the following device even exists.  I would like to find a PCI or PCIe
multi-port serial card that supports MSI or MSIx.  Is there such a
creature?

-- 
***  E-Mail is NOT a SECURE channel  ***
James B. Byrnemailto:byrn...@harte-lyne.ca
Harte  Lyne Limited  http://www.harte-lyne.ca
9 Brockley Drive  vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada  L8E 3C3

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Re: [CentOS-virt] KVM - Virtio drivers for Centos 5.1

[aurfalien]

On Apr 25, 2012, at 5:46 PM, Lars Hecking wrote:

 aurfalien writes:
 Hi all,
 
 Really enjoying KVM as I was a long time user of Xen.   Both are cool, just 
 enjoying the new thing.
 
 Wondering if any one could share some nuggets on how to get a Centos 5.1 VM 
 guest to use virtio?
 
 Trying to use virtio over the ide.
 
 Are you talking about a windows guest?

Hi,

So I updated my Centos 5.1 guest kernel only, to 2.6.18-308.4.1.

Does this or can it have virtio support?

Do I need to install other packages?


- aurf
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Re: [CentOS-virt] KVM - Virtio drivers for Centos 5.1

[Nux!]

On 26.04.2012 22:53, aurfalien wrote:
 On Apr 25, 2012, at 5:46 PM, Lars Hecking wrote:

 aurfalien writes:
 Hi all,

 Really enjoying KVM as I was a long time user of Xen.   Both are 
 cool, just enjoying the new thing.

 Wondering if any one could share some nuggets on how to get a 
 Centos 5.1 VM guest to use virtio?

 Trying to use virtio over the ide.

 Are you talking about a windows guest?

 Hi,

 So I updated my Centos 5.1 guest kernel only, to 2.6.18-308.4.1.

 Does this or can it have virtio support?

 Do I need to install other packages?


 - aurf
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If that kernel is the one from Centos 5.4 or newer, then you might get 
lucky; ideally you should update the whole thing to latest. Any reason 
to not do so?

-- 
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro
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Re: [CentOS-virt] KVM - Virtio drivers for Centos 5.1

[Nux!]

On 26.04.2012 23:12, aurfalien wrote:
 On Apr 26, 2012, at 6:07 PM, Nux! wrote:

 On 26.04.2012 22:53, aurfalien wrote:
 On Apr 25, 2012, at 5:46 PM, Lars Hecking wrote:

 aurfalien writes:
 Hi all,

 Really enjoying KVM as I was a long time user of Xen.   Both are
 cool, just enjoying the new thing.

 Wondering if any one could share some nuggets on how to get a
 Centos 5.1 VM guest to use virtio?

 Trying to use virtio over the ide.

 Are you talking about a windows guest?

 Hi,

 So I updated my Centos 5.1 guest kernel only, to 2.6.18-308.4.1.

 Does this or can it have virtio support?

 Do I need to install other packages?


 - aurf
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 If that kernel is the one from Centos 5.4 or newer, then you might 
 get
 lucky; ideally you should update the whole thing to latest. Any 
 reason
 to not do so?

 Well, its a software license server and I dont want to break 
 anything.

 I would rather just update whats needed as the kernel update didn't
 seem to work.

 Or, should I change the fstab on the running VM after setting the
 disk type to virtio first?

 I assume the mount points should be /dev/vda# etc...

Yes, virtio devices are /dev/vdX.
You might be better off using UUIDs or LABELs instead.

-- 
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Re: [CentOS-virt] KVM - Virtio drivers for Centos 5.1

[Lars Hecking]

aurfalien writes:
 Hi all,
 
 Really enjoying KVM as I was a long time user of Xen.   Both are cool, just 
 enjoying the new thing.
 
 Wondering if any one could share some nuggets on how to get a Centos 5.1 VM 
 guest to use virtio?
 
 Trying to use virtio over the ide.
 
 Are you talking about a windows guest?

 Installing the vm with virt-install, use
  --disk path=/path/to/disk,device=disk,bus=virtio \
  --disk path=/tmp/virtio-win-1.1.16.vfd,device=floppy,perms=ro

 The first line specifies the disk for the vm (e.g. C drive), I usually
 use an lvol. The second line specifies the path to the virtual floppy
 drive with the virtio drivers. For xp, you cannot use the cdrom/.iso
 version of same, the xp installer accepts only a floppy (F6, install
 3rd party drivers). Newer windows versions may be able to deal with
 an iso.

 Digimer's tutorial is well worth a read, even if you end up doing something
 entirely different.

  https://alteeve.com/w/2-Node_Red_Hat_KVM_Cluster_Tutorial

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Re: [CentOS-virt] KVM, VLAN and Bridges and bonding

[Rajagopal Swaminathan]

Greetings,

On Fri, Mar 2, 2012 at 7:22 PM, Baptiste AGASSE
baptiste.aga...@lyra-network.com wrote:
 Hi all,

 I use CentOS5.x + Xen in production for virtualization. I use it with bridged 
 vlan networks and bonding (active-backup) like that:

 eth0  eth1
  |     |
  ---
    |
  bond0---bond0.10-bond0.12 ...
    |            |                |
    |         vlanbr10         vlanbr12
  dom0           |                |
           -     --
           |     |     |     |     |      |  ...
         domU1 domU2 domU3 domU4 domU5  domU6

 For future hypervisors, i want to implement the same things with CentOS6.x + 
 KVM. In test env i've setup CentOS6.2 + KVM (with last updates) with the same 
 network config, but guest lose network connection very often, and i don't 
 know why.

 Network config:

 /etc/sysconfig/network-scripts/ifcfg-bond0.6:
 DEVICE=bond0.6
 BRIDGE=vlanbr6
 ONBOOT=yes
 BOOTPROTO=none
 VLAN=yes
 TYPE=Ethernet

 /etc/sysconfig/network-scripts/ifcfg-vlanbr6:
 DEVICE=vlanbr6
 TYPE=Bridge
 ONBOOT=yes
 BOOTPROTO=none
 DELAY=0

 I've installed guest like that (with a lot of retry because of network loss 
 during installation)

 virt-install --name=guest02-c6 --disk 
 path=/var/lib/libvirt/images/guest02-c6.img,size=10,sparse=false 
 --graphics=spice,keymap=fr --vcpus=2 --ram=2048 
 --location=http://spacewalk.example.com/pub/dist/centos/6/x86_64/ 
 --extra-args=ks=http://spacewalk.example.com/pub/ks/el6/guest02.el6.cfg 
 ip=192.168.2.12 netmask=255.255.255.224 gateway=192.168.2.10 
 dns=192.168.2.10 --os-type=linux --os-variant=rhel6 
 --network=bridge:vlanbr6,model=virtio

 Someone have setup similar environment ?

 Regards.

 Baptiste.


Have you tried Digimer's stuff:

https://alteeve.com/w/2-Node_Red_Hat_KVM_Cluster_Tutorial

Maybe that will give you some pointers

HTH


-- 
Regards,

Rajagopal
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[CentOS-virt] KVM and shared disc...

[Gilberto Nunes]

Hi all

I have deploy some VM's with MS Windows 2008 R2.
I deploy it using virt-manager, on CentOS 6.
On the same host where I installed CentOS I have installed LIO-Target to, in
order to providing iSCSI storage to VM's, 'cause I need install Windows
Cluster failover here.
I was work with iSCSI initiator from inside each VM's but this pratice show
me very instable situations.
Now, I use iscsi-initiator direct from host, on physical linux server and I
try to seek the iSCSI storage from that host...
I was capable  to found the device and attached into VM settings, via
virt-manager.
But, when I try to start the VM, I get this message:

libvirtError: internal error Process exited while reading console log output
char device redirected to /dev/pts/2
qemu-kvm+ -device lsi,id=scsi0,bus=pci.0,addr=0x7: Parameter 'driver'
expects a driver name
Try with argument '?' for a list

Someone has take this error someday???

Thanks

-- 
Gilberto Nunes

(47) 8861-6672
(47) 9676-7530

msn: gilbertonunesferre...@hotmail.com

Skype: gilberto.nunes36
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Re: [CentOS-virt] kvm-qemu: unable to execute QEMU command savevm (monitor missing?)

[Trey Dockendorf]

On Tue, Oct 4, 2011 at 7:42 PM, Jason Brian Friedrich m...@friedrich.org.uk
 wrote:

 Hey Trey,

 just a quick update. If you add the CR repo for CentOS 6.0 you will
 get an updated RPM which solves the problem for me.

  - Jason

 On Tue, Oct 4, 2011 at 01:43, Trey Dockendorf treyd...@gmail.com wrote:
 
 
  On Tue, Sep 27, 2011 at 6:48 AM, Jason Brian Friedrich
  m...@friedrich.org.uk wrote:
 
  System: CentOS Linux release 6.0 (final)
  Kernel: 2.6.32-71.23.1.el6.x86_64
  KVM: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)
  Libvirt: ibvirtd (libvirt) 0.8.1
 
 
  Hi everyone,
 
  I only recently subscribed to this list and hope you can shed some
  light on the following error. I created a VM on my Centos 6 KVM
  machine, used a qcow2 image and wanted to create a snapshot via 'virsh
  snapshot-create' command:
 
  //
  [root@kvmhost ~]# virsh snapshot-create server01
  error: internal error unable to execute QEMU command 'savevm': The
  command savevm has not been found
  \\
 
  I googled before the post, found some [0] threads [1], but could not
  find an answer how to solve the problem. If the kvm-qemu lacks the
  support of a savevm monitor, how can I add one? Do I need to recompile
  kvm-qemu with special flags or is simply a RPM package or a module
  missing?
 
  Thanks in advance,
 
   - Jason
 
 
  [0] http://lists.centos.org/pipermail/centos-virt/2011-July/002557.html
  [1]
  https://www.redhat.com/archives/libvirt-users/2011-August/msg00011.html
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  I ran into this too.  Unfortunately I haven't found a solution either,
 but
  here's an interesting bug report that shows this effects all the way up
 to
  Fedora 15,  https://bugzilla.redhat.com/show_bug.cgi?id=727709.  The one
 fix
  mentioned 89241fe0, I've actually patched into the CentOS libvirt RPM,
 but
  from testing it doesn't seem to be enough. I now can run the
 snapshot-create
  command without error, but nothing appears to happen. I've tested
 creating
  files, taking a snapshot, deleting files and reverting and nothing comes
  back or changes. Also the qcow2 images don't change at all during this
 time
  either. I'm working on applying the other commits mentioned in Comment
 #4,
  but am running into problems since most of those commits are 0.9.0+ and
 I'm
  patching CentOS's 0.8.1.
  I'd love to know if anyone actually has snapshots working in CentOS 5 or
 6.
  This is kind of a critical feature to the entire virtualization process.
  - Trey
 
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Awesome thanks for the info!

Unfortunately I hit a new error, very related it seems to the original
problem, but then I get this error
---
# virsh snapshot-create CentOSVM_0
error: operation failed: failed to take snapshot using command 'savevm
1317846732'



In full debug output I see it failover to HMP, but this is what appears to
be the relevant debug info.  If the full debug is desired let me know (it's
like 1000 lines long spanning 1 second)
---
15:27:12.473: 8080: debug : qemuMonitorJSONIOProcessLine:116 : Line
[{error: {class: CommandNotFound, desc: The command
human-monitor-command has not been found, data: {name:
human-monitor-command}}}]
15:27:12.473: 8080: debug : virJSONValueFromString:933 : string={error:
{class: CommandNotFound, desc: The command human-monitor-command has
not been found, data: {name: human-monitor-command}}}


This was with libvirt-0.8.7-18.el6_1.1 from CentOS 6 CR.  I restarted the
libvirtd daemon after the upgrade, still same result.  Restarted the VM also
, still same.  I only updated libvirt, libvirt-client and libvirt-python
from CR, haven't done a full system update.  I'll try the full update next,
but any suggestions are welcome in the mean time.

Thanks
- Trey
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Re: [CentOS-virt] kvm-qemu: unable to execute QEMU command savevm (monitor missing?)

[Jason Brian Friedrich]

Hey Trey,

just a quick update. If you add the CR repo for CentOS 6.0 you will
get an updated RPM which solves the problem for me.

 - Jason

On Tue, Oct 4, 2011 at 01:43, Trey Dockendorf treyd...@gmail.com wrote:


 On Tue, Sep 27, 2011 at 6:48 AM, Jason Brian Friedrich
 m...@friedrich.org.uk wrote:

 System: CentOS Linux release 6.0 (final)
 Kernel: 2.6.32-71.23.1.el6.x86_64
 KVM: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)
 Libvirt: ibvirtd (libvirt) 0.8.1


 Hi everyone,

 I only recently subscribed to this list and hope you can shed some
 light on the following error. I created a VM on my Centos 6 KVM
 machine, used a qcow2 image and wanted to create a snapshot via 'virsh
 snapshot-create' command:

 //
 [root@kvmhost ~]# virsh snapshot-create server01
 error: internal error unable to execute QEMU command 'savevm': The
 command savevm has not been found
 \\

 I googled before the post, found some [0] threads [1], but could not
 find an answer how to solve the problem. If the kvm-qemu lacks the
 support of a savevm monitor, how can I add one? Do I need to recompile
 kvm-qemu with special flags or is simply a RPM package or a module
 missing?

 Thanks in advance,

  - Jason


 [0] http://lists.centos.org/pipermail/centos-virt/2011-July/002557.html
 [1]
 https://www.redhat.com/archives/libvirt-users/2011-August/msg00011.html
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 I ran into this too.  Unfortunately I haven't found a solution either, but
 here's an interesting bug report that shows this effects all the way up to
 Fedora 15,  https://bugzilla.redhat.com/show_bug.cgi?id=727709.  The one fix
 mentioned 89241fe0, I've actually patched into the CentOS libvirt RPM, but
 from testing it doesn't seem to be enough. I now can run the snapshot-create
 command without error, but nothing appears to happen. I've tested creating
 files, taking a snapshot, deleting files and reverting and nothing comes
 back or changes. Also the qcow2 images don't change at all during this time
 either. I'm working on applying the other commits mentioned in Comment #4,
 but am running into problems since most of those commits are 0.9.0+ and I'm
 patching CentOS's 0.8.1.
 I'd love to know if anyone actually has snapshots working in CentOS 5 or 6.
 This is kind of a critical feature to the entire virtualization process.
 - Trey

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Re: [CentOS-virt] kvm-qemu: unable to execute QEMU command savevm (monitor missing?)

[Trey Dockendorf]

On Tue, Sep 27, 2011 at 6:48 AM, Jason Brian Friedrich 
m...@friedrich.org.uk wrote:

 System: CentOS Linux release 6.0 (final)
 Kernel: 2.6.32-71.23.1.el6.x86_64
 KVM: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)
 Libvirt: ibvirtd (libvirt) 0.8.1


 Hi everyone,

 I only recently subscribed to this list and hope you can shed some
 light on the following error. I created a VM on my Centos 6 KVM
 machine, used a qcow2 image and wanted to create a snapshot via 'virsh
 snapshot-create' command:

 //
 [root@kvmhost ~]# virsh snapshot-create server01
 error: internal error unable to execute QEMU command 'savevm': The
 command savevm has not been found
 \\

 I googled before the post, found some [0] threads [1], but could not
 find an answer how to solve the problem. If the kvm-qemu lacks the
 support of a savevm monitor, how can I add one? Do I need to recompile
 kvm-qemu with special flags or is simply a RPM package or a module
 missing?

 Thanks in advance,

  - Jason


 [0] http://lists.centos.org/pipermail/centos-virt/2011-July/002557.html
 [1]
 https://www.redhat.com/archives/libvirt-users/2011-August/msg00011.html
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I ran into this too.  Unfortunately I haven't found a solution either, but
here's an interesting bug report that shows this effects all the way up to
Fedora 15,  https://bugzilla.redhat.com/show_bug.cgi?id=727709.  The one fix
mentioned 89241fe0, I've actually patched into the CentOS libvirt RPM, but
from testing it doesn't seem to be enough. I now can run the snapshot-create
command without error, but nothing appears to happen. I've tested creating
files, taking a snapshot, deleting files and reverting and nothing comes
back or changes. Also the qcow2 images don't change at all during this time
either. I'm working on applying the other commits mentioned in Comment #4,
but am running into problems since most of those commits are 0.9.0+ and I'm
patching CentOS's 0.8.1.

I'd love to know if anyone actually has snapshots working in CentOS 5 or 6.
This is kind of a critical feature to the entire virtualization process.

- Trey
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[CentOS-virt] kvm-qemu: unable to execute QEMU command savevm (monitor missing?)

[Jason Brian Friedrich]

System: CentOS Linux release 6.0 (final)
Kernel: 2.6.32-71.23.1.el6.x86_64
KVM: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2)
Libvirt: ibvirtd (libvirt) 0.8.1


Hi everyone,

I only recently subscribed to this list and hope you can shed some
light on the following error. I created a VM on my Centos 6 KVM
machine, used a qcow2 image and wanted to create a snapshot via 'virsh
snapshot-create' command:

//
[root@kvmhost ~]# virsh snapshot-create server01
error: internal error unable to execute QEMU command 'savevm': The
command savevm has not been found
\\

I googled before the post, found some [0] threads [1], but could not
find an answer how to solve the problem. If the kvm-qemu lacks the
support of a savevm monitor, how can I add one? Do I need to recompile
kvm-qemu with special flags or is simply a RPM package or a module
missing?

Thanks in advance,

 - Jason


[0] http://lists.centos.org/pipermail/centos-virt/2011-July/002557.html
[1] https://www.redhat.com/archives/libvirt-users/2011-August/msg00011.html
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Re: [CentOS-virt] KVM CO 5.6 VM guest crashes running iSCSI

[Momonth]

It was resolved by re-installing the KVM host with CentOS 6.0,
unfortunately there is not official CentOS 5.6 - CentOS 6.0 upgrade
path.

Vladimir

On Wed, Sep 14, 2011 at 3:56 PM, Momonth momo...@gmail.com wrote:
 Hi All,

 I'm running KVM host on CentOS 5.6 x64, all of my guests are CO 5.6
 x64 as well. I create / run VMs via libvirt.

 Here are the packages I have:

 # rpm -qa | egrep kvm|virt
 kvm-83-224.el5.centos
 python-virtinst-0.400.3-11.el5
 kvm-qemu-img-83-224.el5.centos
 kmod-kvm-83-224.el5.centos
 libvirt-python-0.8.2-15.el5
 etherboot-zroms-kvm-5.4.4-13.el5.centos
 libvirt-0.8.2-15.el5
 libvirt-devel-0.8.2-15.el5

 The problem:

 I attached an iSCSI LUN (netapp appliance) to a guest and everything
 work fine with iscsi-initiator-utils-6.2.0.872-6.el5: LUN discovery,
 attaching to the host etc.
 After that I'm trying to copy ~ 140Gb of data to that LUN via scp from
 another server in the network and the VM crashes after ~ 1 hour of
 copying .. Nothing in the VM / KVM host logs importunately.

 Who has / had similar issues with iSCSI LUNs being connected to a guest?

 Thanks,
 Vladimir

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[CentOS-virt] KVM CO 5.6 VM guest crashes running iSCSI

[Momonth]

Hi All,

I'm running KVM host on CentOS 5.6 x64, all of my guests are CO 5.6
x64 as well. I create / run VMs via libvirt.

Here are the packages I have:

# rpm -qa | egrep kvm|virt
kvm-83-224.el5.centos
python-virtinst-0.400.3-11.el5
kvm-qemu-img-83-224.el5.centos
kmod-kvm-83-224.el5.centos
libvirt-python-0.8.2-15.el5
etherboot-zroms-kvm-5.4.4-13.el5.centos
libvirt-0.8.2-15.el5
libvirt-devel-0.8.2-15.el5

The problem:

I attached an iSCSI LUN (netapp appliance) to a guest and everything
work fine with iscsi-initiator-utils-6.2.0.872-6.el5: LUN discovery,
attaching to the host etc.
After that I'm trying to copy ~ 140Gb of data to that LUN via scp from
another server in the network and the VM crashes after ~ 1 hour of
copying .. Nothing in the VM / KVM host logs importunately.

Who has / had similar issues with iSCSI LUNs being connected to a guest?

Thanks,
Vladimir
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[CentOS-virt] KVM vs ESXi

[Drew]

Morning Everyone,

I'm busy doing a rebuild of my home server and am tossing between
VMware and KVM for this build. I already have experience with ESX, we
use it at work, but I'm debating trying out KVM for a while. The
server itself is a budget build using a Supermicro X8SAX board w/
i7-950  12GB RAM, LSI 3081 SAS RAID (1068e based), rolled into a
NorcoTek 16 Bay SAS case. Not fancy but also decent enough for home
use. I don't expect high performance out of this unit so unless the
gear is hopelessly outclassed, I'm not in a position to entertain
upgrading. Right now forking over $1000-$1500 on a $2000 system for a
pair of higher end LSI/3ware/Acreca controller just isn't in the
budget. ;-)

My question to everyone are these:

-How well does KVM support Windows Guests? I'm already running a
Server 2008r2 and WHS 2011 (based on 08r2) machines at home which I
want to consolidate into this box.

-Does KVM have a concept of virtual switches and and are they tied to
physical NICs? ESXi allows me to create a vSwitch that isn't tied to a
physical NIC so I can create a DMZ that exists solely within the host
system. I'd like to replicate that if possible.

I know these are probably questions that I could answer on my own by
RTFM but I have already, and never really got the answers I needed.
Pretty much every how-to assumed I'd be doing basic stuff and not
dabbling with advanced stuff. I also know that what's written doesn't
always match what's in the field and you folks are the field. And with
CentOS 6 just around the corner (no flame wars please, my nomex pants
are at the cleaners :-P ) I'm wanting to know if it's worth holding
off another month or so on finalizing my build.

Thanks,


-- 
Drew

Nothing in life is to be feared. It is only to be understood.
--Marie Curie
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Re: [CentOS-virt] KVM vs ESXi

[Eric Searcy]

On Wed, May 18, 2011 at 6:46 AM, Gilberto Nunes
gilberto.nune...@gmail.com wrote:
 -Does KVM have a concept of virtual switches and and are they tied to
 physical NICs? ESXi allows me to create a vSwitch that isn't tied to a
 physical NIC so I can create a DMZ that exists solely within the host
 system. I'd like to replicate that if possible.

 Yes... You can use VirtManager to work with this feature...

And in fact I'd say it's concept is *better*.  KVM/libvirt just
leverages the built-in virtual switching (bridging) support in Linux
accessible through brctl.  So you can create virtual bridges, tie
ethernet devices to them, and have visibility into what's going on
using standard tools like brctl and iproute2 tools if you'd like
(instead of VirtManager).  You can also use stuff like iptables to
filter traffic going across bridges...

Sad to admit it, but I have a Linux box functioning as a router which
also runs KVM domains ... eth0 is a bridge port (so no IP address),
the virtual switch br0 has both the router internal IP (.1) and the
service-providing IP of the box (still the IP I used to manage the
KVM host from before I was using it as the router), eth1 has multiple
VLANs with IPs on our Fiber WAN and the local out-of-band network.
The NICs of the guests are also attached to br0, naturally.  And of
course iptables is able to securely filter traffic across all that.
It's a stopgap measure, but works flawlessly.

If you want a NAT subnet, behind the scenes it's real Linux routing
with iptables snat module (or masquerade).  Your host-only network is
a bridge without any hardware NICs attached as ports, only KVM NICs.
And so on.  Sublime!

Eric

PS, all the above is also true for running Xen on CentOS, though it
comes with its own scripts for setting up the bridging instead of
leveraging libvirt to do it
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[CentOS-virt] KVM switch in promiscuous mode

[carlopmart]

Hi all,

  I am trying to enable promiscuous mode on a kvm switch due to sniff 
all traffic using snort installed on a kvm guest.

  I have found a partial solution configuring this bridge with brctl 
setaging br0 0, but all vms sees all traffic.

  I think the soultion is using ebtables but I didn't found any doc 
about how can I do under kvm (and upstream recommends disable this 
function).

  Any ideas??

Thanks.
-- 
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carlopmart {at} gmail {d0t} com
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[CentOS-virt] KVM, virsh attach-disk problems

[Jussi Hirvi]

Greetings, list!

I hope you forgive cross-posting - I only now found this list.

I am in the process of configuring a KVM stack of about 8 vms. Mostly I 
am concerned about performance, as there will be a lot of I/O.

My last problem is this: I try to add a fresh, unformatted disk 
partition to a KVM guest. I follow the directions given here:

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Virtualization/index.html#proc-Virtualization-Adding_storage_devices_to_guests-Adding_physical_block_devices_to_virtualized_guests

First I check that the module acpiphp is present on the guest. It is.

On the host I write:

virsh attach-disk test1 /dev/sdb1 sda --driver tap --mode shareable

- test1 is my guest domain
- /dev/sdb1 is the name of the unformatted partition on the host
- sda is what it is supposed to be called on the guest (the name is
unused on the guest)
- the example in RHEL Virtualization guide says --mode readonly. This
does not sound right for a hard disk; hence I try --mode shareable;
the error (see below) however is the same, whichever I use

Now, the command above produces this error. I find no google results
with this error text. Can someone tell, what causes the error?

   error: Failed to attach disk error: operation failed: adding scsi
   disk controller failed: type scsi not a hotpluggable PCI device.
   failed to add if=scsi

I found a post (2009, on fedora-virt list), which is relevant:

http://www.redhat.com/archives/fedora-virt/2009-December/msg00032.html

Otherwise, I have found almost nothing!

BTW, I can attach a disk to the KVM guest, using a virtio driver:

   [root@113 info]# virsh attach-disk test1 /dev/sdd1 vdb
   --driver virtio --mode shareable
   Disk attached successfully

I have not seen any mention anywhere about using virtio drivers like 
this. And the problem with this is that the new disk does not survive 
guest reboot. At guest startup virsh complains about the virtio drivers.

- Jussi

-- 
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Suvilahdenkatu 1 B 78 * 00500 Helsinki * Finland
Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms)
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Re: [CentOS-virt] KVM, virsh attach-disk problems

[Jussi Hirvi]

Maybe my question is difficult, though it should not be. Virsh 
attach-disk seems to be poorly documented.

One correction: this was definitely not my last problem - it was only 
the latest. :-)

Now I continue configuring my kvm system with the traditional way - 
one filesystem per guest.

- Jussi

On 23.4.2011 17.58, Jussi Hirvi wrote:
 Greetings, list!

 I hope you forgive cross-posting - I only now found this list.

 I am in the process of configuring a KVM stack of about 8 vms. Mostly I
 am concerned about performance, as there will be a lot of I/O.

 My last problem is this: I try to add a fresh, unformatted disk
 partition to a KVM guest. I follow the directions given here:

 http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Virtualization/index.html#proc-Virtualization-Adding_storage_devices_to_guests-Adding_physical_block_devices_to_virtualized_guests

 First I check that the module acpiphp is present on the guest. It is.

 On the host I write:

 virsh attach-disk test1 /dev/sdb1 sda --driver tap --mode shareable

 - test1 is my guest domain
 - /dev/sdb1 is the name of the unformatted partition on the host
 - sda is what it is supposed to be called on the guest (the name is
 unused on the guest)
 - the example in RHEL Virtualization guide says --mode readonly. This
 does not sound right for a hard disk; hence I try --mode shareable;
 the error (see below) however is the same, whichever I use

 Now, the command above produces this error. I find no google results
 with this error text. Can someone tell, what causes the error?

   error: Failed to attach disk error: operation failed: adding scsi
   disk controller failed: type scsi not a hotpluggable PCI device.
   failed to add if=scsi

 I found a post (2009, on fedora-virt list), which is relevant:

 http://www.redhat.com/archives/fedora-virt/2009-December/msg00032.html

 Otherwise, I have found almost nothing!

 BTW, I can attach a disk to the KVM guest, using a virtio driver:

   [root@113 info]# virsh attach-disk test1 /dev/sdd1 vdb
   --driver virtio --mode shareable
  Disk attached successfully

 I have not seen any mention anywhere about using virtio drivers like
 this. And the problem with this is that the new disk does not survive
 guest reboot. At guest startup virsh complains about the virtio drivers.

 - Jussi



-- 
Jussi Hirvi * Green Spot
Suvilahdenkatu 1 B 78 * 00500 Helsinki * Finland
Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms)
jussi.hi...@greenspot.fi * http://www.greenspot.fi
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[CentOS-virt] KVM and USB support

[MargoAndTodd]

Hi All,

Can anyone with access to RHEL 6 tell me if the
official KVM supports USB ports under Windows
guests?  (I would like to be able to operate
Logitech's universal remote.)

Many thanks,
-T
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[CentOS-virt] KVM and Windows /use pmtimer

[Eric Searcy]

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualization/chap-Virtualization-KVM_guest_timing_management.html

Want to get some more people's opinion on this: the above doc says to use the 
boot parameter /use pmtimer to use the RTC instead of the TSC for all time 
sources which resolves guest timing issues.  One: does this have any bearing 
on whether the host has the constant_tsc flag (i.e. are all the sections that 
follow Configuring hosts without a constant Time Stamp Counter subordinate to 
it, or does that just have bearing on power management on that one CPU 
listed---AMD rev F)?

Other question: http://support.microsoft.com/kb/938448 implies that for 2003 
SP2 /use pmtimer shouldn't be needed as it will use the platform timer (RTC) 
if you have ACPI or APIC present.  (By default, Windows Server 2003 Service 
Pack 2 (SP2) uses the PM timer for all multiprocessor Advanced Programmable 
Interrupt Controller (APIC) Hardware Abstraction Layers (HALs) or Advanced 
Configuration and Power Interface (ACPI) HALs.)  Anybody have any experience 
as to whether this (using ACPI feature in KVM) resolves the timing issues 
without needing pmtimer explicitly set?

Thanks,

Eric

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Re: [CentOS-virt] KVM and Windows /use pmtimer

[compdoc]

Whenever I create a new VM, I use the windows 2003 template and everything
just works. It doesn't matter what OS I use - linux or windows.

If I use a template that matches the OS I'm trying to install, like the
linux templates. It tends to crash.

I wonder if the 2003 template has the right ACPI and APIC emulation...

No need for /use pmtimer



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Re: [CentOS-virt] KVM: where are the directions?

[Benjamin Franz]

On 11/14/2010 05:25 PM, compdoc wrote:
 Unless you have old cards you have to retain, PCI-x isn't useful anymore.
 Too slow.


Depends on what you consider 'too slow'. I just benchmarked an 8 drive 
software RAID6 (8 x 1.5 TByte Seagate drives) on a PCI-X card (Areca 
ARC-1120 configured for JBOD operation) at 196 megabytes/second 
sustained sequential write and 420 megabytes/second sustained sequential 
read with bonnie++ on a Supermicro PDSMi board.

Just how fast do you need?

-- 
Benjamin Franz

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Re: [CentOS-virt] KVM: where are the directions?

[Benjamin Franz]

On 11/15/2010 09:00 AM, compdoc wrote:

 It's still useful, but why invest in an older technology when the newer
 technology is there and doesn't cost more?


Because it *does* cost more and doesn't (in my case) provide anything 
special I need feature wise. I already had a nice hot swappable 2U case 
with dual p/s, a not incredibly old server motherboard, dual core CPU, 
memory et al available. For an incremental cost of about $460 dollars I 
bought an Areca 1120 PCI-X controller to match my existing hardware 
rather than buying more like two thousand dollars in new hardware to do 
exactly the same thing, at pretty much the same performance level.

-- 
Benjamin Franz

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Re: [CentOS-virt] KVM: where are the directions?

[Kenni Lund]

2010/11/14 MargoAndTodd margoandt...@gmail.com:
 On 11/13/2010 07:44 AM, compdoc wrote:
 $ uname -r -m
 2.6.18-194.26.1.el5 i686

 $ rpm -qa \*kvm\*
 kvm-36-1
 kmod-kvm-36-3


 Not even close to 83.  :-(

 My centos 5.5 has kvm 83. I'm not sure how you got that old stuff

 I am 32 bit.

 yum install kvm kmod-kvm

You might have it installed it with yum, but in that case you've added
3rd party RPM-repositories (rpmforge, EPEL, etc).

These are the packages which were available in *32 bit* CentOS 5.5 at
release time (search for kvm and you'll find nothing):
http://mirror.stanford.edu/yum/pub/centos/5.5/os/i386/CentOS/

And these are the packages available currently to *32bit* CentOS 5.5
through updates:
http://mirror.stanford.edu/yum/pub/centos/5.5/updates/i386/RPMS/
(still nothing)

Now, these are the packages which were available in *64bit* CentOS 5.5
at release time:
http://mirror.stanford.edu/yum/pub/centos/5.5/os/x86_64/CentOS/
Notice that this list contains kvm-83-164.el5.x86_64.rpm and other
related KVM packages...

...and the current 64-bit updates:
http://mirror.stanford.edu/yum/pub/centos/5.5/updates/x86_64/RPMS/
which contains several kvm-packages, with the latest being
kvm-83-164.el5_5.23.x86_64.rpm.

So, as I said, the 32 bit CentOS doesn't contain KVM, not v36, not v83
- you'll need a 64-bit system. Also, if you want a stable system,
DON'T use 3rd party repositories unless you take extremely care and
know what you're doing. If you enable some random bleeding edge 3rd
party repository, and lets yum install packages and updates from it,
you could just as well setup your server with some bleeding edge Linux
distribution instead of RHEL/CentOS; Fedora, Ubuntu Desktop, Gentoo,
Arch Linux, [insert your favorite bleeding edge distro here]. Unless
you've setup yum priorities (which is not a good thing either, but
better than nothing), yum will always download the unstable packages
from the 3rd party repositories, and replace stable CentOS packages
with them (since they're newer).

Best regards
Kenni
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Re: [CentOS-virt] KVM: where are the directions?

[MargoAndTodd]

On 11/14/2010 03:11 PM, Kenni Lund wrote:
 ...and the current 64-bit updates:
 http://mirror.stanford.edu/yum/pub/centos/5.5/updates/x86_64/RPMS/
 which contains several kvm-packages, with the latest being
 kvm-83-164.el5_5.23.x86_64.rpm.

Guess I will just have to upgrade my office computer to
64 bit.  Oh well ...  :')   (Got my eye on a Supermicro X8SAX
and an i7-930.)  :-)

-T
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Re: [CentOS-virt] KVM: where are the directions?

[compdoc]

Unless you have old cards you have to retain, PCI-x isn't useful anymore.
Too slow.




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Re: [CentOS-virt] KVM: where are the directions?

[MargoAndTodd]

On 11/14/2010 05:25 PM, compdoc wrote:
 Unless you have old cards you have to retain, PCI-x isn't useful anymore.
 Too slow.

Supermicro X8SAX:
2 (x16) PCI-Express 2.0,
 1 (x4) PCI-Express (using X8 slot),
 2x 64-bit 133/100MHz PCI-X,
 1x 32-bit PCI Slots

I put the video and the RAID card in the PCI-e slots.
I use the PCI and PCI-x for things like parallel
port cards, which cost double for PCI-e.

-T

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Re: [CentOS-virt] KVM: where are the directions?

[Mathieu Baudier]

 kvm-83. That said, as you've probably already read in the docs, KVM is
 a technology preview in RHEL 5.x...6.0 will be the first version
 with official/stable KVM support by Red Hat.

My understanding is that KVM was tech preview in RHEL/CentOS 5.4 and
officially supported from RHEL/CentOS 5.5.

Am I mistaken?
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Re: [CentOS-virt] KVM: where are the directions?

[Kenni Lund]

2010/11/13 MargoAndTodd margoandt...@gmail.com:
 On 11/11/2010 01:50 PM, Kenni Lund wrote:
 You'll never need to run it from the command line, use the available
 management tools (libvirt+virsh from the command line,
 libvirt+virt-manager from X11), it makes your life much much easier.
 I've been running qemu-kvm from the command line for several years,
 and while it's fine to know how the system works, then you definitely
 don't want to manage your enterprise virtual machines that way. For
 example, if you start qemu-kvm twice in parallel, with the same HDD
 image, you'll damage or destroy your HDD image. Libvirt takes care of
 such banalities and many others.

 Thank you!

 These are small business servers.  The CentOS server is the only server
 on the network.  I start my VM's in rc.local and shut them down in
 rd.shutdown (I wrote my own).  So, I am stuck with the command line.
 Thank you for the heads up on running them twice!

 But, on my new office machine, I will be running them headed, so I
 will be using your instructions there.

Running from the command line doesn't mean you can't use the management tools:

Quick'n'dirty overview:

Install new guests:
virt-install

Start guest:
virsh start $guestname

List running guests:
virsh list
virsh list --all

Shutdown guest (sends an ACPI signal to the guest, telling it to
shutdown correctly - same a clicking on the power button for 1 sec on
most computers):
virsh shutdown $guestname

Shutdown guest immediately (like pulling the power cable from a computer):
virsh destroy $guestname

Edit a guest:
virsh edit $guestname

etc. etc...run virsh --help and virt-install --help for more options.

Best regards
Kenni
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Re: [CentOS-virt] KVM: where are the directions?

[Kenni Lund]

2010/11/13 MargoAndTodd margoandt...@gmail.com:
 On 11/11/2010 01:50 PM, Kenni Lund wrote:
 No, you're not running an old version of qemu-kvm in CentOS. Like most
 other packages, Red Hat has selected an (old and stable) version as
 the baseline version and then backported bugfixes and new features
 from newer versions of the package, to fulfill the needs of their
 enterprise customers. kvm-83 in CentOS is NOT equal to upstream
 kvm-83. That said, as you've probably already read in the docs, KVM is
 a technology preview in RHEL 5.x...6.0 will be the first version
 with official/stable KVM support by Red Hat.

 Best regards
 Kenni

 Hi Kenni,

 This is my setup:

 $ cat /etc/redhat-release
 CentOS release 5.5 (Final)

 $ uname -r -m
 2.6.18-194.26.1.el5 i686

 $ rpm -qa \*kvm\*
 kvm-36-1
 kmod-kvm-36-3


 Not even close to 83.  :-(

These KVM-packages are from some 3rd party repository, aren't they? I
don't think that 5.5 has KVM support on i686 at all...use CentOS 5.5
x86_64 instead.

Best regards
Kenni
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Re: [CentOS-virt] KVM: where are the directions?

[Kenni Lund]

2010/11/13 Mathieu Baudier mbaud...@argeo.org:
 kvm-83. That said, as you've probably already read in the docs, KVM is
 a technology preview in RHEL 5.x...6.0 will be the first version
 with official/stable KVM support by Red Hat.

 My understanding is that KVM was tech preview in RHEL/CentOS 5.4 and
 officially supported from RHEL/CentOS 5.5.

Sorry, you're right...nevertheless, you still need RHEL/CentOS 6.0 to
get stuff like stable ABI for Windows guests.

Best regards
Kenni
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Re: [CentOS-virt] KVM: where are the directions?

[compdoc]

 $ uname -r -m
 2.6.18-194.26.1.el5 i686

 $ rpm -qa \*kvm\*
 kvm-36-1
 kmod-kvm-36-3


 Not even close to 83.  :-(

My centos 5.5 has kvm 83. I'm not sure how you got that old stuff


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Re: [CentOS-virt] KVM: where are the directions?

[MargoAndTodd]

On 11/13/2010 02:05 AM, Kenni Lund wrote:
 2010/11/13 MargoAndToddmargoandt...@gmail.com:
 On 11/11/2010 01:50 PM, Kenni Lund wrote:
 You'll never need to run it from the command line, use the available
 management tools (libvirt+virsh from the command line,
 libvirt+virt-manager from X11), it makes your life much much easier.
 I've been running qemu-kvm from the command line for several years,
 and while it's fine to know how the system works, then you definitely
 don't want to manage your enterprise virtual machines that way. For
 example, if you start qemu-kvm twice in parallel, with the same HDD
 image, you'll damage or destroy your HDD image. Libvirt takes care of
 such banalities and many others.

 Thank you!

 These are small business servers.  The CentOS server is the only server
 on the network.  I start my VM's in rc.local and shut them down in
 rd.shutdown (I wrote my own).  So, I am stuck with the command line.
 Thank you for the heads up on running them twice!

 But, on my new office machine, I will be running them headed, so I
 will be using your instructions there.

 Running from the command line doesn't mean you can't use the management tools:

 Quick'n'dirty overview:

 Install new guests:
 virt-install

 Start guest:
 virsh start $guestname

 List running guests:
 virsh list
 virsh list --all

 Shutdown guest (sends an ACPI signal to the guest, telling it to
 shutdown correctly - same a clicking on the power button for 1 sec on
 most computers):
 virsh shutdown $guestname

 Shutdown guest immediately (like pulling the power cable from a computer):
 virsh destroy $guestname

 Edit a guest:
 virsh edit $guestname

 etc. etc...run virsh --help and virt-install --help for more options.

 Best regards
 Kenni
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Thank you!
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Re: [CentOS-virt] KVM: where are the directions?

[MargoAndTodd]

On 11/13/2010 02:06 AM, Kenni Lund wrote:
 2010/11/13 MargoAndToddmargoandt...@gmail.com:
 On 11/11/2010 01:50 PM, Kenni Lund wrote:
 No, you're not running an old version of qemu-kvm in CentOS. Like most
 other packages, Red Hat has selected an (old and stable) version as
 the baseline version and then backported bugfixes and new features
 from newer versions of the package, to fulfill the needs of their
 enterprise customers. kvm-83 in CentOS is NOT equal to upstream
 kvm-83. That said, as you've probably already read in the docs, KVM is
 a technology preview in RHEL 5.x...6.0 will be the first version
 with official/stable KVM support by Red Hat.

 Best regards
 Kenni

 Hi Kenni,

 This is my setup:

 $ cat /etc/redhat-release
 CentOS release 5.5 (Final)

 $ uname -r -m
 2.6.18-194.26.1.el5 i686

 $ rpm -qa \*kvm\*
 kvm-36-1
 kmod-kvm-36-3


 Not even close to 83.  :-(

 These KVM-packages are from some 3rd party repository, aren't they? I
 don't think that 5.5 has KVM support on i686 at all...use CentOS 5.5
 x86_64 instead.

 Best regards
 Kenni

To do that I will be need a who new computer.  H.  (Got
me eyes on a Supermicro X8SAX and an i7-930.)

-T
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Re: [CentOS-virt] KVM: where are the directions?

[MargoAndTodd]

On 11/13/2010 07:44 AM, compdoc wrote:
 $ uname -r -m
 2.6.18-194.26.1.el5 i686

 $ rpm -qa \*kvm\*
 kvm-36-1
 kmod-kvm-36-3


 Not even close to 83.  :-(

 My centos 5.5 has kvm 83. I'm not sure how you got that old stuff

I am 32 bit.

yum install kvm kmod-kvm
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Re: [CentOS-virt] KVM: where are the directions?

[MargoAndTodd]

On 11/11/2010 01:50 PM, Kenni Lund wrote:
 You'll never need to run it from the command line, use the available
 management tools (libvirt+virsh from the command line,
 libvirt+virt-manager from X11), it makes your life much much easier.
 I've been running qemu-kvm from the command line for several years,
 and while it's fine to know how the system works, then you definitely
 don't want to manage your enterprise virtual machines that way. For
 example, if you start qemu-kvm twice in parallel, with the same HDD
 image, you'll damage or destroy your HDD image. Libvirt takes care of
 such banalities and many others.

Thank you!

These are small business servers.  The CentOS server is the only server
on the network.  I start my VM's in rc.local and shut them down in
rd.shutdown (I wrote my own).  So, I am stuck with the command line.
Thank you for the heads up on running them twice!

But, on my new office machine, I will be running them headed, so I
will be using your instructions there.

-T
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Re: [CentOS-virt] KVM: where are the directions?

[MargoAndTodd]

On 11/11/2010 01:50 PM, Kenni Lund wrote:
 No, you're not running an old version of qemu-kvm in CentOS. Like most
 other packages, Red Hat has selected an (old and stable) version as
 the baseline version and then backported bugfixes and new features
 from newer versions of the package, to fulfill the needs of their
 enterprise customers. kvm-83 in CentOS is NOT equal to upstream
 kvm-83. That said, as you've probably already read in the docs, KVM is
 a technology preview in RHEL 5.x...6.0 will be the first version
 with official/stable KVM support by Red Hat.

 Best regards
 Kenni

Hi Kenni,

This is my setup:

$ cat /etc/redhat-release
CentOS release 5.5 (Final)

$ uname -r -m
2.6.18-194.26.1.el5 i686

$ rpm -qa \*kvm\*
kvm-36-1
kmod-kvm-36-3


Not even close to 83.  :-(

-T

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Re: [CentOS-virt] KVM: where are the directions?

[Kenni Lund]

2010/11/11 MargoAndTodd margoandt...@gmail.com:
 On 11/10/2010 08:31 PM, Mark Pryor wrote:


 --- On Wed, 11/10/10, jaye...@gmail.comjaye...@gmail.com  wrote:

 From: jaye...@gmail.comjaye...@gmail.com
 Subject: Re: [CentOS-virt] KVM: where are the directions?
 To: Discussion about the virtualization on CentOScentos-virt@centos.org
 Date: Wednesday, November 10, 2010, 7:15 PM
 rpm -ql kvm
 rpm -qa | grep kvm


 to continue this:
 - verify an amd64 install of kvm --
 $ rpm -qa | grep kvm
 etherboot-zroms-kvm-5.4.4-13.el5.centos
 kvm-83-164.el5_5.21
 kmod-kvm-83-164.el5_5.21

 $ sudo lsmod | grep kvm
 kvm_amd                69416  0
 kvm                   226336  2 ksm,kvm_amd

 yum install bridge-utils tunctl
 - snip -

 kvm is basically qemu.
 The kvm launcher is (by default) not in your path:
 /usr/libexec/qemu-kvm

 request help on qemu-kvm and you will see almost the same thing which is in 
 qemu.

 Trying to learn kvm via libvirt is over-kill - stick with the commandline.

You'll never need to run it from the command line, use the available
management tools (libvirt+virsh from the command line,
libvirt+virt-manager from X11), it makes your life much much easier.
I've been running qemu-kvm from the command line for several years,
and while it's fine to know how the system works, then you definitely
don't want to manage your enterprise virtual machines that way. For
example, if you start qemu-kvm twice in parallel, with the same HDD
image, you'll damage or destroy your HDD image. Libvirt takes care of
such banalities and many others.


 Fedora 13 Live CD:
 qemu-kvm -cdrom ./Fedora-13-i686-Live-XFCE.iso  -boot d -m 384 -net
 nic,model=rtl8139  -localtime -usb

 Froze up at automatic boot in 10 seconds. This is probably because my
 CentOS 5.5 is 32 bit and I am running a really old version of qemu-kvm.

No, you're not running an old version of qemu-kvm in CentOS. Like most
other packages, Red Hat has selected an (old and stable) version as
the baseline version and then backported bugfixes and new features
from newer versions of the package, to fulfill the needs of their
enterprise customers. kvm-83 in CentOS is NOT equal to upstream
kvm-83. That said, as you've probably already read in the docs, KVM is
a technology preview in RHEL 5.x...6.0 will be the first version
with official/stable KVM support by Red Hat.

Best regards
Kenni
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