Re: [ovirt-users] Proper Network Configuration

[Luca 'remix_tj' Lorenzetto]

On Mon, Oct 2, 2017 at 11:49 PM, ~Stack~  wrote:
> Greetings,
>
> For various reasons I have multiple networks that I am required to work
> with. I just want to ensure that I've understood the documentation for
> setting up Ovirt correctly.
>
> - First is my BMC/ilo network. The security team wants as few entry
> points into this as possible and wants as much segregation as possible.
>
> - Second is my "management" access network. For my other machines on
> this network this means admin-SSH/rsyslog/SaltStack configuration
> management/ect.
>
> - Third is my high speed network where my NFS storage sits and
> applications that need the bandwidth do their thing.
>
> - Fourth is my "public" access.
>
> My Engine host has the "management" and "public" networks.
> My Hypervisor hosts have the "BMC/ilo", "management", and "storage"
> networks.
>
> Is there a reason why I should add "public" on the hypervisors?


No, you should only plug the network to oVirt but not configure any ip
on the hypervisors.

>
> Is there a reason why I may need "BMC/ilo" or "storage" on the Engine host?

No, you don't need. I've only management on engine host. The
hypervisors, instead have an ip on management and storage network, and
no ip on the other networks. For bmc traffic we use routed access
through a firewall that is dividing bmc network from the rest of the
world.

Luca


-- 
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calcoli che potrebbero essere affidati a chiunque se si usassero delle
macchine"
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"Internet è la più grande biblioteca del mondo.
Ma il problema è che i libri sono tutti sparsi sul pavimento"
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Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , 
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Re: [ovirt-users] Hosted engine setup question

[Demeter Tibor]

Dear Charles, 
Thank you for your reply. 

I don't want to make an another storage domain, I just want to do a 
detach-attach procedure with the existing. 

Also, I have an another question. Is it possible delete snapshots in 4.1 what 
were created in 3.5? How is safe this? 
I have some vm snapshot in the old system, but I don't want more outage with 
deleting them.The 3.5 does not support the live snapshot deleting, but the 4.1 
yes. 

Thanks, 

Tibor 

- 2017. okt.. 2., 19:55, Charles Kozler  írta: 

> I did a 3.6 to 4.1 like this. I moved all of my VMs to a new storage domain 
> (the
> other was hyperconverged gluster) and then took a full outage, shut down all 
> of
> my VMs, detached from 3.6, and imported on 4.1. I had no issues other than
> expected mac address changes, but I think you can manually override this in 
> the
> engine somewhere
> If you are worried, do it with one VM. Create a new storage domain that both
> clusters can "see", move one VM to the domain on 3.6, detach, and import to
> 3.1. Bring the VM up

> If it is Linux VM's older than systemd and using sysvinit, you will hit issues
> where your MAC address will change and udev will move it to eth# wherever # is
> the next available NIC in your VM host

> On Mon, Oct 2, 2017 at 12:54 PM, Demeter Tibor < [ mailto:tdeme...@itsmart.hu 
> |
> tdeme...@itsmart.hu ] > wrote:

>> Hi,
>> Can anyone answer my questions?

>> Thanks in advance,
>> R,

>> Tibor

>> - 2017. szept.. 19., 8:31, Demeter Tibor < [ mailto:tdeme...@itsmart.hu |
>> tdeme...@itsmart.hu ] > írta:

>>> - I have a productive ovirt cluster based on 3.5 series. This using a 
>>> shared nfs
>>> storage. Is it possible to migrate VMs from 3.5 to 4.1 with detach shared
>>> storage from the old cluster and attach it to the new cluster?
>>> - If yes what will happend with the VM properies? For example mac addresses,
>>> limits, etc. Those will be migrated or not?

>>> Thanks in advance,
>>> Regard

>>> Tibor

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[ovirt-users] Doubt about iptables host config

[Gianluca Cecchi]

Hello,
I have read this interesting blog post
https://www.ovirt.org/blog/2016/12/extension-iptables-rules-oVirt-hosts/

In my case, to allow incoming connections from Nagios server to connect to
Nagios nrpe daemon installed on hosts I have run

[root@ovmgr1 ~]# engine-config --set IPTablesConfigSiteCustom='
> -A INPUT -p tcp --dport 5666 -s 10.4.5.99/32 -m comment --comment "Nagios
NRPE daemon" -j ACCEPT
> '
[root@ovmgr1 ~]#

and

systemctl restart ovirt-engine


BTW: the link above misses the final ' apex at the end of the similar
command in the given example

On my oVirt running host (CentOS 7.4) in the mean time I have run

[g.cecchi@ov300 ~]$ sudo iptables -I INPUT 16 -p tcp --dport 5666 -s
10.4.5.99/32 -m comment --comment "Nagios NRPE daemon" -j ACCEPT

In fact the current "reject-with icmp-host-prohibited" was line 16 and I
have inserted it right before.

So far so good.

I have a doubt if, in case of host put into maintenance and then
reactivated, or rebooted, the rule will remain.
Or do I have anyway to put any line in any file on host to set it
persistently?

I wouldn't like to go and reinstall it only to statically set a new
iptables rule.

Thanks,
Gianluca
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Re: [ovirt-users] Doubt about iptables host config

[Yedidyah Bar David]

On Tue, Oct 3, 2017 at 11:51 AM, Gianluca Cecchi
 wrote:
> Hello,
> I have read this interesting blog post
> https://www.ovirt.org/blog/2016/12/extension-iptables-rules-oVirt-hosts/
>
> In my case, to allow incoming connections from Nagios server to connect to
> Nagios nrpe daemon installed on hosts I have run
>
> [root@ovmgr1 ~]# engine-config --set IPTablesConfigSiteCustom='
>> -A INPUT -p tcp --dport 5666 -s 10.4.5.99/32 -m comment --comment "Nagios
>> NRPE daemon" -j ACCEPT
>> '
> [root@ovmgr1 ~]#
>
> and
>
> systemctl restart ovirt-engine
>
>
> BTW: the link above misses the final ' apex at the end of the similar
> command in the given example
>
> On my oVirt running host (CentOS 7.4) in the mean time I have run
>
> [g.cecchi@ov300 ~]$ sudo iptables -I INPUT 16 -p tcp --dport 5666 -s
> 10.4.5.99/32 -m comment --comment "Nagios NRPE daemon" -j ACCEPT
>
> In fact the current "reject-with icmp-host-prohibited" was line 16 and I
> have inserted it right before.
>
> So far so good.
>
> I have a doubt if, in case of host put into maintenance and then
> reactivated, or rebooted, the rule will remain.

AFAIU nothing touches iptables conf on hosts except for host-deploy
(Re/Install).

> Or do I have anyway to put any line in any file on host to set it
> persistently?

I think it should be safe to manually edit /etc/sysconfig/iptables
in that case.

Of course, verify on a test system.

Also, you might be happy to know that in 4.2 we'll support firewalld,
which is much nicer to work with than patching/generating
/etc/sysconfig/iptables.
See also:

https://bugzilla.redhat.com/show_bug.cgi?id=995362

>
> I wouldn't like to go and reinstall it only to statically set a new iptables
> rule.
>
> Thanks,
> Gianluca
>
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Re: [ovirt-users] Doubt about iptables host config

[Gianluca Cecchi]

On Tue, Oct 3, 2017 at 11:36 AM, Yedidyah Bar David  wrote:

>
>
> I think it should be safe to manually edit /etc/sysconfig/iptables
> in that case.
>
> Of course, verify on a test system.
>
> Also, you might be happy to know that in 4.2 we'll support firewalld,
> which is much nicer to work with than patching/generating
> /etc/sysconfig/iptables.
> See also:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=995362
>
>
>
OK, thanks. It worked.

Nice to see the news about firewalld.

And if I want to do the same for the engine, that indeed is configured with
firewalld?

Currently on it I see this kind of configuration:

[root@ovmgr1 ~]# firewall-cmd --get-default-zone
public
[root@ovmgr1 ~]#

[root@ovmgr1 ~]# firewall-cmd --get-active-zones
public
  interfaces: ens192
[root@ovmgr1 ~]#

It seems nrpe is already an usable predefined service:
[root@ovmgr1 ~]# firewall-cmd --get-services | tr -s ' ' '\n' | grep nrpe
nrpe
[root@ovmgr1 ~]#


So, based on current config,  I can add it this way:

firewall-cmd --permanent --add-service=nrpe
firewall-cmd --reload

This way it should survive an engine reboot, but will it survive an
engine-setup command run when updating configuration or when upgrading
between minor/major updates?
Or should I manage also some oVirt managed files on engine?

Thanks,
Gianluca
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Re: [ovirt-users] Ovirt causing strange network issues?

[Derek Atkins]

I'm sorry. What is STP?
And how do I turn that off?

-derek
Sent using my mobile device. Please excuse any typos.



On October 2, 2017 7:41:15 PM Colin Coe  wrote:


Hi

We saw something very similar to this a couple of years ago.  In our case,
it was caused by STP being enabled on our hypervisors.

HTH



On 3 Oct. 2017 04:56, "Derek Atkins"  wrote:


Hi,

I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.

tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times.  I know it's
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.

Long version:

I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
on a single host machine. Indeed, the host had an uptime of 200+ days
and was working great until approximately midnight, September 21/22
(just over a week ago).  I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.

My network is configured as:

  fiber modem <-> edgerouter <-> switch <-> everything else

ovirt is living in the "everything else" area.

When I sit with a laptop connected to either the everything else range
or even directly connected to the fiber modem, I run 'mtr' and see
network times (starting at the fiber modem) that bounce all over the
place.  When I unplug ovirt I see consistent 3-5ms times.  Plug it back
in, voom, back up to badness.

I've spent several hours plugging and unplugging different devices
trying to isolate the issue.  The only "device" that has any effect is
my ovirt box.

I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine.  Once nothing else is running (but the host itself), only
then does the network seem to return to normal.

I'm really at my wits end on this; I have no idea what is causing this
or what might have changed to cause the issue right at that time.  I
also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way.  But my
experiementation is definitely showing a direct correlation.

Help!!

-derek

--
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   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant
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Re: [ovirt-users] Ovirt causing strange network issues?

[Derek Atkins]

Do you mean spanning tree protocol?
I'm not sure how that could cross a router boundary, but it is something to 
look into..


-derek
Sent using my mobile device. Please excuse any typos.



On October 3, 2017 7:12:00 AM Derek Atkins  wrote:


I'm sorry. What is STP?
And how do I turn that off?

-derek
Sent using my mobile device. Please excuse any typos.



On October 2, 2017 7:41:15 PM Colin Coe  wrote:


Hi

We saw something very similar to this a couple of years ago.  In our case,
it was caused by STP being enabled on our hypervisors.

HTH



On 3 Oct. 2017 04:56, "Derek Atkins"  wrote:


Hi,

I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.

tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times.  I know it's
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.

Long version:

I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
on a single host machine. Indeed, the host had an uptime of 200+ days
and was working great until approximately midnight, September 21/22
(just over a week ago).  I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.

My network is configured as:

  fiber modem <-> edgerouter <-> switch <-> everything else

ovirt is living in the "everything else" area.

When I sit with a laptop connected to either the everything else range
or even directly connected to the fiber modem, I run 'mtr' and see
network times (starting at the fiber modem) that bounce all over the
place.  When I unplug ovirt I see consistent 3-5ms times.  Plug it back
in, voom, back up to badness.

I've spent several hours plugging and unplugging different devices
trying to isolate the issue.  The only "device" that has any effect is
my ovirt box.

I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine.  Once nothing else is running (but the host itself), only
then does the network seem to return to normal.

I'm really at my wits end on this; I have no idea what is causing this
or what might have changed to cause the issue right at that time.  I
also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way.  But my
experiementation is definitely showing a direct correlation.

Help!!

-derek

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   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant
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Re: [ovirt-users] Ovirt causing strange network issues?

[Colin Coe]

Spanning Tree Protocol.

Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever) does
not have an STP=yes line.

CC

On 3 Oct. 2017 19:11, "Derek Atkins"  wrote:

> I'm sorry. What is STP?
> And how do I turn that off?
>
> -derek
> Sent using my mobile device. Please excuse any typos.
>
> On October 2, 2017 7:41:15 PM Colin Coe  wrote:
>
>> Hi
>>
>> We saw something very similar to this a couple of years ago.  In our
>> case, it was caused by STP being enabled on our hypervisors.
>>
>> HTH
>>
>>
>>
>> On 3 Oct. 2017 04:56, "Derek Atkins"  wrote:
>>
>>> Hi,
>>>
>>> I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
>>> will be able to help me.
>>>
>>> tl;dr: Ovirt is doing something on my network that is causing my fiber
>>> modem to go from 3-5ms to 300-1000+ms round trip times.  I know it's
>>> ovirt because when I unplug ovirt from my network the issue goes away;
>>> when I plug it back in, the issue recurs.
>>>
>>> Long version:
>>>
>>> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
>>> on a single host machine. Indeed, the host had an uptime of 200+ days
>>> and was working great until approximately midnight, September 21/22
>>> (just over a week ago).  I was on an airplane halfway across the
>>> Atlantic at that time, so it wasn't anything I did.
>>>
>>> My network is configured as:
>>>
>>>   fiber modem <-> edgerouter <-> switch <-> everything else
>>>
>>> ovirt is living in the "everything else" area.
>>>
>>> When I sit with a laptop connected to either the everything else range
>>> or even directly connected to the fiber modem, I run 'mtr' and see
>>> network times (starting at the fiber modem) that bounce all over the
>>> place.  When I unplug ovirt I see consistent 3-5ms times.  Plug it back
>>> in, voom, back up to badness.
>>>
>>> I've spent several hours plugging and unplugging different devices
>>> trying to isolate the issue.  The only "device" that has any effect is
>>> my ovirt box.
>>>
>>> I have tried to debug this in several ways, but really the only thing
>>> that seems to have helped at all is shutting down all the VMs and the
>>> hosted engine.  Once nothing else is running (but the host itself), only
>>> then does the network seem to return to normal.
>>>
>>> I'm really at my wits end on this; I have no idea what is causing this
>>> or what might have changed to cause the issue right at that time.  I
>>> also can't imagine what ovirt is doing over the network that could cause
>>> the modem, two physical hops away, to lose its mind in this way.  But my
>>> experiementation is definitely showing a direct correlation.
>>>
>>> Help!!
>>>
>>> -derek
>>>
>>> --
>>>Derek Atkins 617-623-3745 <(617)%20623-3745>
>>>de...@ihtfp.com www.ihtfp.com
>>>Computer and Internet Security Consultant
>>> ___
>>> Users mailing list
>>> Users@ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>
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Re: [ovirt-users] Ovirt causing strange network issues?

[Derek Atkins]

On the host or in the guests?

-derek
Sent using my mobile device. Please excuse any typos.



On October 3, 2017 7:15:35 AM Colin Coe  wrote:


Spanning Tree Protocol.

Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever) does
not have an STP=yes line.

CC

On 3 Oct. 2017 19:11, "Derek Atkins"  wrote:


I'm sorry. What is STP?
And how do I turn that off?

-derek
Sent using my mobile device. Please excuse any typos.

On October 2, 2017 7:41:15 PM Colin Coe  wrote:


Hi

We saw something very similar to this a couple of years ago.  In our
case, it was caused by STP being enabled on our hypervisors.

HTH



On 3 Oct. 2017 04:56, "Derek Atkins"  wrote:


Hi,

I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.

tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times.  I know it's
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.

Long version:

I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
on a single host machine. Indeed, the host had an uptime of 200+ days
and was working great until approximately midnight, September 21/22
(just over a week ago).  I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.

My network is configured as:

  fiber modem <-> edgerouter <-> switch <-> everything else

ovirt is living in the "everything else" area.

When I sit with a laptop connected to either the everything else range
or even directly connected to the fiber modem, I run 'mtr' and see
network times (starting at the fiber modem) that bounce all over the
place.  When I unplug ovirt I see consistent 3-5ms times.  Plug it back
in, voom, back up to badness.

I've spent several hours plugging and unplugging different devices
trying to isolate the issue.  The only "device" that has any effect is
my ovirt box.

I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine.  Once nothing else is running (but the host itself), only
then does the network seem to return to normal.

I'm really at my wits end on this; I have no idea what is causing this
or what might have changed to cause the issue right at that time.  I
also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way.  But my
experiementation is definitely showing a direct correlation.

Help!!

-derek

--
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   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant
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Re: [ovirt-users] Proper Network Configuration

[~Stack~]

On 10/03/2017 03:08 AM, Luca 'remix_tj' Lorenzetto wrote:
> On Mon, Oct 2, 2017 at 11:49 PM, ~Stack~  wrote:
>> Greetings,
>>
>> For various reasons I have multiple networks that I am required to work
>> with. I just want to ensure that I've understood the documentation for
>> setting up Ovirt correctly.
>>
>> - First is my BMC/ilo network. The security team wants as few entry
>> points into this as possible and wants as much segregation as possible.
>>
>> - Second is my "management" access network. For my other machines on
>> this network this means admin-SSH/rsyslog/SaltStack configuration
>> management/ect.
>>
>> - Third is my high speed network where my NFS storage sits and
>> applications that need the bandwidth do their thing.
>>
>> - Fourth is my "public" access.
>>
>> My Engine host has the "management" and "public" networks.
>> My Hypervisor hosts have the "BMC/ilo", "management", and "storage"
>> networks.
>>
>> Is there a reason why I should add "public" on the hypervisors?
> 
> 
> No, you should only plug the network to oVirt but not configure any ip
> on the hypervisors.
> 
>>
>> Is there a reason why I may need "BMC/ilo" or "storage" on the Engine host?
> 
> No, you don't need. I've only management on engine host. The
> hypervisors, instead have an ip on management and storage network, and
> no ip on the other networks. For bmc traffic we use routed access
> through a firewall that is dividing bmc network from the rest of the
> world.
> 
> Luca

Thanks for the information, Luca!
I appreciate it.






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Re: [ovirt-users] Ovirt causing strange network issues?

[Jason Keltz]

Derek,
Have you used tcpdump to check what network traffic is coming out of your 
box? Is it possible that it is some kind of DoS attack from outside in or 
that your VM was compromised and is attacking other external hosts?


Hope you get to the bottom of it!
Jason.

Sent with AquaMail for Android
http://www.aqua-mail.com


On October 2, 2017 4:56:54 PM Derek Atkins  wrote:


Hi,

I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.

tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times.  I know it's
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.

Long version:

I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
on a single host machine. Indeed, the host had an uptime of 200+ days
and was working great until approximately midnight, September 21/22
(just over a week ago).  I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.

My network is configured as:

  fiber modem <-> edgerouter <-> switch <-> everything else

ovirt is living in the "everything else" area.

When I sit with a laptop connected to either the everything else range
or even directly connected to the fiber modem, I run 'mtr' and see
network times (starting at the fiber modem) that bounce all over the
place.  When I unplug ovirt I see consistent 3-5ms times.  Plug it back
in, voom, back up to badness.

I've spent several hours plugging and unplugging different devices
trying to isolate the issue.  The only "device" that has any effect is
my ovirt box.

I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine.  Once nothing else is running (but the host itself), only
then does the network seem to return to normal.

I'm really at my wits end on this; I have no idea what is causing this
or what might have changed to cause the issue right at that time.  I
also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way.  But my
experiementation is definitely showing a direct correlation.

Help!!

-derek

--
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   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant
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Re: [ovirt-users] Ovirt causing strange network issues?

[Derek Atkins]

A quick check of the host shows STP=off in ifcfg-ovirtmgmt.  I see nothing 
about STP elsewhere in the configuration on the host.


-derek
Sent using my mobile device. Please excuse any typos.



On October 3, 2017 7:15:35 AM Colin Coe  wrote:


Spanning Tree Protocol.

Make sure the /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever) does
not have an STP=yes line.

CC

On 3 Oct. 2017 19:11, "Derek Atkins"  wrote:


I'm sorry. What is STP?
And how do I turn that off?

-derek
Sent using my mobile device. Please excuse any typos.

On October 2, 2017 7:41:15 PM Colin Coe  wrote:


Hi

We saw something very similar to this a couple of years ago.  In our
case, it was caused by STP being enabled on our hypervisors.

HTH



On 3 Oct. 2017 04:56, "Derek Atkins"  wrote:


Hi,

I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
will be able to help me.

tl;dr: Ovirt is doing something on my network that is causing my fiber
modem to go from 3-5ms to 300-1000+ms round trip times.  I know it's
ovirt because when I unplug ovirt from my network the issue goes away;
when I plug it back in, the issue recurs.

Long version:

I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
on a single host machine. Indeed, the host had an uptime of 200+ days
and was working great until approximately midnight, September 21/22
(just over a week ago).  I was on an airplane halfway across the
Atlantic at that time, so it wasn't anything I did.

My network is configured as:

  fiber modem <-> edgerouter <-> switch <-> everything else

ovirt is living in the "everything else" area.

When I sit with a laptop connected to either the everything else range
or even directly connected to the fiber modem, I run 'mtr' and see
network times (starting at the fiber modem) that bounce all over the
place.  When I unplug ovirt I see consistent 3-5ms times.  Plug it back
in, voom, back up to badness.

I've spent several hours plugging and unplugging different devices
trying to isolate the issue.  The only "device" that has any effect is
my ovirt box.

I have tried to debug this in several ways, but really the only thing
that seems to have helped at all is shutting down all the VMs and the
hosted engine.  Once nothing else is running (but the host itself), only
then does the network seem to return to normal.

I'm really at my wits end on this; I have no idea what is causing this
or what might have changed to cause the issue right at that time.  I
also can't imagine what ovirt is doing over the network that could cause
the modem, two physical hops away, to lose its mind in this way.  But my
experiementation is definitely showing a direct correlation.

Help!!

-derek

--
   Derek Atkins 617-623-3745 <(617)%20623-3745>
   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant
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Re: [ovirt-users] Doubt about iptables host config

[Yedidyah Bar David]

On Tue, Oct 3, 2017 at 1:49 PM, Gianluca Cecchi
 wrote:
> On Tue, Oct 3, 2017 at 11:36 AM, Yedidyah Bar David  wrote:
>>
>>
>>
>> I think it should be safe to manually edit /etc/sysconfig/iptables
>> in that case.
>>
>> Of course, verify on a test system.
>>
>> Also, you might be happy to know that in 4.2 we'll support firewalld,
>> which is much nicer to work with than patching/generating
>> /etc/sysconfig/iptables.
>> See also:
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=995362
>>
>>
>
> OK, thanks. It worked.
>
> Nice to see the news about firewalld.
>
> And if I want to do the same for the engine, that indeed is configured with
> firewalld?
>
> Currently on it I see this kind of configuration:
>
> [root@ovmgr1 ~]# firewall-cmd --get-default-zone
> public
> [root@ovmgr1 ~]#
>
> [root@ovmgr1 ~]# firewall-cmd --get-active-zones
> public
>   interfaces: ens192
> [root@ovmgr1 ~]#
>
> It seems nrpe is already an usable predefined service:
> [root@ovmgr1 ~]# firewall-cmd --get-services | tr -s ' ' '\n' | grep nrpe
> nrpe
> [root@ovmgr1 ~]#
>
>
> So, based on current config,  I can add it this way:
>
> firewall-cmd --permanent --add-service=nrpe
> firewall-cmd --reload
>
> This way it should survive an engine reboot, but will it survive an
> engine-setup command run when updating configuration or when upgrading
> between minor/major updates?

It should, yes.

> Or should I manage also some oVirt managed files on engine?

engine-setup should in principle never touch existing services, only
add new ones.

This is different with iptables. engine-setup generates a new conf file,
and saves it (also) in /etc/ovirt-engine/iptables.example . On upgrade,
it compares it to the system-wide file /etc/sysconfig/iptables, and if
they differ, it prompts to confirm, optionally showing you the diff.

Regards,
-- 
Didi
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Re: [ovirt-users] Ovirt causing strange network issues?

[Derek Atkins]

Hi,

Yes, I have (well, wireshark, but effectively the same thing).
Nothing is standing out.

I'm trying to visually coordinate the wireshark traces with my mtr run to
try to see "what's going on when my RTTs skyrocket".  Honestly the only
correlation I'm seeing is that it's when the ovirt host is checking the
ovirt engine health (and I get a bunch of TCP out of order messages).

I've already ruled out overflow of my Arris modem NAT/forwarding table.
I've already ruled out Ethernet Pause Frames.

I don't understand how something inside my network can affect the Arris in
such a profound way across both the switch and router.

-derek

On Tue, October 3, 2017 7:38 am, Jason Keltz wrote:
> Derek,
> Have you used tcpdump to check what network traffic is coming out of your
> box? Is it possible that it is some kind of DoS attack from outside in or
> that your VM was compromised and is attacking other external hosts?
>
> Hope you get to the bottom of it!
> Jason.
>
> Sent with AquaMail for Android
> http://www.aqua-mail.com
>
>
> On October 2, 2017 4:56:54 PM Derek Atkins  wrote:
>
>> Hi,
>>
>> I'm at my wits end so I'm tossing this here in the hopes that SOMEONE
>> will be able to help me.
>>
>> tl;dr: Ovirt is doing something on my network that is causing my fiber
>> modem to go from 3-5ms to 300-1000+ms round trip times.  I know it's
>> ovirt because when I unplug ovirt from my network the issue goes away;
>> when I plug it back in, the issue recurs.
>>
>> Long version:
>>
>> I've been running Ovirt 4.0.6 happily on CentOS 7.3 for several months
>> on a single host machine. Indeed, the host had an uptime of 200+ days
>> and was working great until approximately midnight, September 21/22
>> (just over a week ago).  I was on an airplane halfway across the
>> Atlantic at that time, so it wasn't anything I did.
>>
>> My network is configured as:
>>
>>   fiber modem <-> edgerouter <-> switch <-> everything else
>>
>> ovirt is living in the "everything else" area.
>>
>> When I sit with a laptop connected to either the everything else range
>> or even directly connected to the fiber modem, I run 'mtr' and see
>> network times (starting at the fiber modem) that bounce all over the
>> place.  When I unplug ovirt I see consistent 3-5ms times.  Plug it back
>> in, voom, back up to badness.
>>
>> I've spent several hours plugging and unplugging different devices
>> trying to isolate the issue.  The only "device" that has any effect is
>> my ovirt box.
>>
>> I have tried to debug this in several ways, but really the only thing
>> that seems to have helped at all is shutting down all the VMs and the
>> hosted engine.  Once nothing else is running (but the host itself), only
>> then does the network seem to return to normal.
>>
>> I'm really at my wits end on this; I have no idea what is causing this
>> or what might have changed to cause the issue right at that time.  I
>> also can't imagine what ovirt is doing over the network that could cause
>> the modem, two physical hops away, to lose its mind in this way.  But my
>> experiementation is definitely showing a direct correlation.
>>
>> Help!!
>>
>> -derek
>>
>> --
>>Derek Atkins 617-623-3745
>>de...@ihtfp.com www.ihtfp.com
>>Computer and Internet Security Consultant
>> ___
>> Users mailing list
>> Users@ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
>
>


-- 
   Derek Atkins 617-623-3745
   de...@ihtfp.com www.ihtfp.com
   Computer and Internet Security Consultant

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[ovirt-users] OVN and change of mgmt network

[Gianluca Cecchi]

Hello,
I previously had OVN running on engine (as OVN provider with northd and
northbound and southbound DBs) and hosts (with OVN controller).

After changing mgmt ip of hosts (engine has retained instead the same ip),
I executed again on them the command:

vdsm-tool ovn-config  

Now I think I have to clean up some things, eg:

1) On engine
where I get these lines below

systemctl status ovn-northd.service -l
. . .
Sep 29 14:41:42 ovmgr1 ovsdb-server[940]: ovs|5|reconnect|ERR|tcp:
10.4.167.40:37272: no response to inactivity probe after 5 seconds,
disconnecting
Oct 03 11:52:00 ovmgr1 ovsdb-server[940]: ovs|6|reconnect|ERR|tcp:
10.4.167.41:52078: no response to inactivity probe after 5 seconds,
disconnecting

The two IPs are the old ones of two hosts
It seems that a restart of the services has fixed...
Can anyone confirm if I have to do anything else?

2) On hosts (there are 3 hosts with OVN on ip 10.4.192.32/33/34)
where I currently have this output

[root@ov301 ~]# ovs-vsctl show
3a38c5bb-0abf-493d-a2e6-345af8aedfe3
Bridge br-int
fail_mode: secure
Port "ovn-1dce5b-0"
Interface "ovn-1dce5b-0"
type: geneve
options: {csum="true", key=flow, remote_ip="10.4.192.32"}
Port "ovn-ddecf0-0"
Interface "ovn-ddecf0-0"
type: geneve
options: {csum="true", key=flow, remote_ip="10.4.192.33"}
Port "ovn-fd413b-0"
Interface "ovn-fd413b-0"
type: geneve
options: {csum="true", key=flow, remote_ip="10.4.168.74"}
Port br-int
Interface br-int
type: internal
ovs_version: "2.7.2"
[root@ov301 ~]#

The IPs of kind 10.4.192.x are ok.
But there is a left-over of an old host I initially used for tests,
corresponding to 10.4.168.74, that now doesn't exist anymore

How can I clean records for 1) and 2)?

Thanks,
Gianluca
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[ovirt-users] oVirt Hosted Engine Backup and Restore guide

[Alexander Vrublevskiy]

Hello Community!

I'm looking for information about Hosted Engine backup and restore procedures. 
There's HE how-to which refers to oVirt Hosted Engine Backup and Restore guide:
https://www.ovirt.org/documentation/how-to/hosted-engine/#hosted-engine-backup-and-restore
  

but the link leads to 404 error.

Could anyone provide working link to the document, please?

And the main point why I'm looking for it is HE migration: we need to move HE 
to another data center. It'd be awesome if someone could share experience of 
such migration or at least point the direction to explore.

Thanks in advance!
Regards
Alex
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Re: [ovirt-users] OVN and change of mgmt network

[Marcin Mirecki]

Hello Gianluca,

Please check on the engine what hosts are registered on ovn-north:
#ovn-sbctl show

For each registered host you should see something like:
   Chassis "69b6b2a6-5afb-4908-8d66-c648cbe09ba8"
   hostname: "f43"
   Encap geneve
   ip: "192.168.120.43"
   

I would assume you have some unwanted entries there (10.4.168.74)

To get rid of this please use:
# ovn-sbctl chassis-del // for example: ovn-sbctl
chassis-del 69b6b2a6-5afb-4908-8d66-c648cbe09ba8

Please let me know if this helps.

Note also that you would have to runplug/plug any vnics on any vm's you
have on those two hosts.

Marcin



On Tue, Oct 3, 2017 at 3:41 PM, Gianluca Cecchi 
wrote:

> Hello,
> I previously had OVN running on engine (as OVN provider with northd and
> northbound and southbound DBs) and hosts (with OVN controller).
>
> After changing mgmt ip of hosts (engine has retained instead the same ip),
> I executed again on them the command:
>
> vdsm-tool ovn-config  
>
> Now I think I have to clean up some things, eg:
>
> 1) On engine
> where I get these lines below
>
> systemctl status ovn-northd.service -l
> . . .
> Sep 29 14:41:42 ovmgr1 ovsdb-server[940]: ovs|5|reconnect|ERR|tcp:10
> .4.167.40:37272: no response to inactivity probe after 5 seconds,
> disconnecting
> Oct 03 11:52:00 ovmgr1 ovsdb-server[940]: ovs|6|reconnect|ERR|tcp:10
> .4.167.41:52078: no response to inactivity probe after 5 seconds,
> disconnecting
>
> The two IPs are the old ones of two hosts
> It seems that a restart of the services has fixed...
> Can anyone confirm if I have to do anything else?
>
> 2) On hosts (there are 3 hosts with OVN on ip 10.4.192.32/33/34)
> where I currently have this output
>
> [root@ov301 ~]# ovs-vsctl show
> 3a38c5bb-0abf-493d-a2e6-345af8aedfe3
> Bridge br-int
> fail_mode: secure
> Port "ovn-1dce5b-0"
> Interface "ovn-1dce5b-0"
> type: geneve
> options: {csum="true", key=flow, remote_ip="10.4.192.32"}
> Port "ovn-ddecf0-0"
> Interface "ovn-ddecf0-0"
> type: geneve
> options: {csum="true", key=flow, remote_ip="10.4.192.33"}
> Port "ovn-fd413b-0"
> Interface "ovn-fd413b-0"
> type: geneve
> options: {csum="true", key=flow, remote_ip="10.4.168.74"}
> Port br-int
> Interface br-int
> type: internal
> ovs_version: "2.7.2"
> [root@ov301 ~]#
>
> The IPs of kind 10.4.192.x are ok.
> But there is a left-over of an old host I initially used for tests,
> corresponding to 10.4.168.74, that now doesn't exist anymore
>
> How can I clean records for 1) and 2)?
>
> Thanks,
> Gianluca
>
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Re: [ovirt-users] OVN and change of mgmt network

[Gianluca Cecchi]

On Tue, Oct 3, 2017 at 4:05 PM, Marcin Mirecki  wrote:

> Hello Gianluca,
>
> Please check on the engine what hosts are registered on ovn-north:
> #ovn-sbctl show
>
> For each registered host you should see something like:
>Chassis "69b6b2a6-5afb-4908-8d66-c648cbe09ba8"
>hostname: "f43"
>Encap geneve
>ip: "192.168.120.43"
>
>
> I would assume you have some unwanted entries there (10.4.168.74)
>
> To get rid of this please use:
> # ovn-sbctl chassis-del // for example: ovn-sbctl
> chassis-del 69b6b2a6-5afb-4908-8d66-c648cbe09ba8
>
> Please let me know if this helps.
>
> Note also that you would have to runplug/plug any vnics on any vm's you
> have on those two hosts.
>
> Marcin
>
>
Hello Marcin.
it worked like a charm.. ;-)

The "show" option of the command returned 4 chassis:
- 3 are of running oVirt hosts that I notice have been automatically
updated after the  "vdsm-tool ovn-config ..." command run on them (their
dns name has remained the same)
- the leftover one
After removing it with the suggested command it disappeared both from
engine (ovn-sbctl show) and from hosts (ovs-vsctl show)

I'm going to power on some VMs with their nics on OVN and see if all is ok.
Thank you very much.

Gianluca
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Re: [ovirt-users] deprecating export domain?

[Pavel Gashev]

Shubham,

I hope you’re going to keep the Export feature at least as “Clone to another 
storage domain”. In the real life, the copy-in/copy-out is required for 
backups. Moving disks between Data SD and Backup SD is not a way to backup or 
restore. It’s often required to keep VM runnable during backing up, and it’s 
often required to keep a backup during restoring. Typical backup storage is not 
designed for running VMs directly. SSDs are not cheap enough for storing 
backups, and there are HDDs especially designed for storing cold data [1]. 
Thus, the disaster recovery scenario is a great feature, but it can’t be a 
recommended way to recover.

And I hope you are going to show VMs on backup storages in a separate list 
(“Backups” instead of “Virtual Machines”).

[1] http://www.seagate.com/enterprise-storage/hard-disk-drives/archive-hdd/

I hope this helps.

From: shubham dubey 
Date: Monday, 2 October 2017 at 19:10
To: Pavel Gashev 
Cc: Maor Lipchuk , "users@ovirt.org" 
Subject: Re: [ovirt-users] deprecating export domain?

Yes, I just gave an example case. If you want to use vms with a backup, then 
you can just copy that vm or disk into another domain and make it as backup 
domain as you do it in export domain.
In simple language, main aim of creating backup domain is just to use all the 
features available in export domain without creating a dedicated export domain.
Hope you understand now:)



On 2 Oct 2017 8:55 pm, "Pavel Gashev" 
mailto:p...@acronis.com>> wrote:
Shubham,

I don’t really understand the process you described. If I need to backup the 
whole datacenter, you say I have to turn off all VMs, and make them 
non-runnable. It doesn’t look like a backing up. It looks like an archiving. 
But what if I need to keep my VMs running?


From: shubham dubey mailto:sdubey...@gmail.com>>
Date: Monday, 2 October 2017 at 15:55
To: Charles Kozler mailto:ckozler...@gmail.com>>
Cc: Pavel Gashev mailto:p...@acronis.com>>, users 
mailto:users@ovirt.org>>, Maor Lipchuk 
mailto:mlipc...@redhat.com>>
Subject: Re: [ovirt-users] deprecating export domain?

Hi,
The backup storage domain is quite like export storage domain but with easy 
usability.
Since you can change any data domain into backup domain any time, you not need 
to create a dedicated
export storage domain for backup or disaster recovery purpose. Altough its 
working is same as export sd.
The process of backup can be as simple as this:
1) turn off all the vms in your storage domain
2) select backup flag to convert that into backup domain.
Once the domain is used for backup, you cannot make any changes to its vms, 
disk etc as mentioned by maor.
And yes, you can convert export sd to data domain using cli script but it is 
not required anymore.
If in future export storage domain get deprecated, you not need to be worry 
about that much since you can convert all your
export sd into data domain anytime and start using backup feature instead.
Regards,
Shubham


On Mon, Oct 2, 2017 at 6:04 PM, Charles Kozler 
mailto:ckozler...@gmail.com>> wrote:
Thank you for clearing this up for me everyone. My concern that something like 
the export domain wasnt going to exist and it was just going to be deprecated 
with no alternative. Glad to hear all the news of the SD

On Mon, Oct 2, 2017 at 8:31 AM, Pavel Gashev 
mailto:p...@acronis.com>> wrote:
Maor,

Could you please clarify, what would be the process of making backup of a 
running VM to an existing backup storage domain?

I’m asking because it looks like the process is going to be quite the same:
1. Clone VM from a snapshot
2. Move the cloned VM to a backup storage domain

An ability of choosing destination storage for cloned VMs would increase backup 
efficiency. On the other hand, an ability of exporting VM from a snapshot would 
increase the efficiency in the same way even without creating new entity.

Indeed, Backup SDs would increase efficiency of disaster recovery. But the same 
would be achieved by converting Export SDs to Data SDs using a small CLI 
utility.


On 01/10/2017, 15:32, "users-boun...@ovirt.org 
on behalf of Maor Lipchuk" 
mailto:users-boun...@ovirt.org> on behalf of 
mlipc...@redhat.com> wrote:

On Sun, Oct 1, 2017 at 2:50 PM, Nir Soffer 
mailto:nsof...@redhat.com>> wrote:
>
> Attaching and detaching data domain was not designed for backing up vms.
> How would you use it for backup?
>
> How do you ensure that a backup clone of a vm is not started by mistake,
> changing the backup contents?

That is a good question.
We recently introduced a new feature called "backup storage domain"
which you can mark the storage domain as backup storage domain.
That can guarantee that no VMs will run with disks/leases reside on
the storage domain.
The feature should already exist in oVirt 4.2 (despite a bug that
should be handled with this patch https://gerrit.ovirt.org/#/c/81290/)
You can fin

Re: [ovirt-users] LVM structure

[Adam Litke]

Does this report an error on the host where you are having problems
activating logical volumes?

lvs -a -o +devices

Also, do the lvm commands succeed when you explicitly disable lvmetad, ie...

lvchange --config 'global {use_lvmetad=0}' -ay ...

On Wed, Sep 20, 2017 at 3:38 AM, Nicolas Ecarnot 
wrote:

> Hello,
>
> I'm still coping with my qemu image corruption, and I'm following some
> Redhat guidelines that explains the way to go :
> - Start the VM
> - Identify the host
> - On this host, run the ps command to identify the disk image location :
>
> # ps ax|grep qemu-kvm|grep vm_name
>
> - Look for "-drive file=/rhev/data-center/000
> 1-0001-0001-0001-033e/b72773dc-c99c-472a-9548-
> 503c122baa0b/images/91bfb2b4-5194-4ab3-90c8-3c172959f712/
> e7174214-3c2b-4353-98fd-2e504de72c75"
> (YMMV)
>
> - Resolve this symbolic link
> # ls -la /rhev/data-center/0001-0001-0001-0001-033e/b7277
> 3dc-c99c-472a-9548-503c122baa0b/images/91bfb2b4-5194-4ab3-
> 90c8-3c172959f712/e7174214-3c2b-4353-98fd-2e504de72c75
> lrwxrwxrwx 1 vdsm kvm 78  3 oct.   2016 /rhev/data-center/0001-000
> 1-0001-0001-033e/b72773dc-c99c-472a-9548-503c122baa0
> b/images/91bfb2b4-5194-4ab3-90c8-3c172959f712/e7174214-3c2b-4353-98fd-2e504de72c75
> -> /dev/b72773dc-c99c-472a-9548-503c122baa0b/e7174214-3c2b-4353
> -98fd-2e504de72c75
>
> - Shutdown the VM
> - On the SPM, activate the logical volume :
> # lvchange -ay /dev/b72773dc-c99c-472a-9548-5
> 03c122baa0b/e7174214-3c2b-4353-98fd-2e504de72c75
>
> - Verify the state of the qemu image :
> # qemu-img check /dev/b72773dc-c99c-472a-9548-5
> 03c122baa0b/e7174214-3c2b-4353-98fd-2e504de72c75
>
> - If needed, attempt a repair :
> # qemu-img check -r all /dev/...
>
> - In any case, deactivate the LV :
> # lvchange -an /dev/...
>
>
> I followed this steps tens of times, and finding the LV and activating it
> was obvious and successful.
> Since yesterday, I'm finding some VMs one which these steps are not
> working : I can identify the symbolic link, but the SPM neither the host
> are able to find the LV device, thus can not LV-activate it :
>
> # lvchange -ay /dev/de2fdaa0-6e09-4dd2-beeb-1
> 812318eb893/ce13d349-151e-4631-b600-c42b82106a8d
>   Failed to find logical volume "de2fdaa0-6e09-4dd2-beeb-18123
> 18eb893/ce13d349-151e-4631-b600-c42b82106a8d"
>
> Either I need two more coffees, either I may be missing a step or
> something to check.
> Looking at the SPM /dev/disk/* structure, it looks like very sound (I can
> see my three storage domains dm-name-* series of links).
>
> As the VM can nicely be ran and stopped, does the host activates something
> more before being launched?
>
> --
> Nicolas ECARNOT
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Re: [ovirt-users] oVirt Hosted Engine Backup and Restore guide

[Simone Tiraboschi]

On Tue, Oct 3, 2017 at 2:53 PM, Alexander Vrublevskiy  wrote:

> Hello Community!
>
> I'm looking for information about Hosted Engine backup and restore
> procedures. There's HE how-to which refers to oVirt Hosted Engine Backup
> and Restore guide:
>
> https://www.ovirt.org/documentation/how-to/hosted-
> engine/#hosted-engine-backup-and-restore
>

https://www.ovirt.org/documentation/self-hosted/chap-Backing_up_and_Restoring_an_EL-Based_Self-Hosted_Environment/


>
> but the link leads to 404 error.
>
> Could anyone provide working link to the document, please?
>
> And the main point why I'm looking for it is HE migration: we need to move
> HE to another data center. It'd be awesome if someone could share
> experience of such migration or at least point the direction to explore.
>
> Thanks in advance!
>
> Regards
> Alex
>
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Re: [ovirt-users] oVirt Hosted Engine Backup and Restore guide

[Alexander Vrublevskiy]

Thank you very much, Simone!

Regards
Alex

>Вторник,  3 октября 2017, 19:21 +03:00 от Simone Tiraboschi 
>:
>
>
>
>On Tue, Oct 3, 2017 at 2:53 PM, Alexander Vrublevskiy  < or...@mail.ru > wrote:
>>Hello Community!
>>
>>I'm looking for information about Hosted Engine backup and restore 
>>procedures. There's HE how-to which refers to oVirt Hosted Engine Backup and 
>>Restore guide:
>>https://www.ovirt.org/documentation/how-to/hosted-engine/#hosted-engine-backup-and-restore
>>  
>
>https://www.ovirt.org/documentation/self-hosted/chap-Backing_up_and_Restoring_an_EL-Based_Self-Hosted_Environment/
> 
>>
>>but the link leads to 404 error.
>>
>>Could anyone provide working link to the document, please?
>>
>>And the main point why I'm looking for it is HE migration: we need to move HE 
>>to another data center. It'd be awesome if someone could share experience of 
>>such migration or at least point the direction to explore.
>>
>>Thanks in advance!
>>Regards
>>Alex
>>
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>>Users mailing list
>>Users@ovirt.org
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>>
>
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[ovirt-users] Killing Zombie or hungTasks

[Anantha Raghava]

Hi,

We attempted to import a VM from export domain and that failed for some 
reason. However the import task or the activity never ended in spite of 
throwing an error. Even after 4 full days, on the VM an Hour glass was 
shown and it kept reporting, hung task.


Finally we had to run engine-update, that removed Zombie tasks and VM 
started showing as DOWN and we could remove the VM.


I believe, this is not the right process to remove the zombie tasks or 
hung tasks. Is there a better method without running "engine-update"?


Thanks & Regards,


Anantha Raghava

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