What are the advantages / disadvantes of Xen / KVM?
Can't say which is better, but KVM works very nicely. I use it to run
several Linux and Windows virtual machines that act as servers, but which
are not graphic intensive. (just basic desktop use)
Is the one that is slow the one that has 2g resident?
2 Gigs ram? Yes.
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I hope this in the right list, but I was wondering if someone could help me
with a VM I have that has lately started having problems. It had been
running for years without problems. It's possible an update is causing this,
but I can't say.
The VM is running CentOS 5.8 and after a time, the
-Original Message-
From: Robert Dinse [mailto:nan...@eskimo.com]
Sent: Sunday, May 19, 2013 10:04 PM
To: comp...@hotrodpc.com; Discussion about the virtualization on CentOS
Subject: Re: [CentOS-virt] VM Slowness
How about a top on the host? Could the virtual machine be getting swapped
Sorry to bring this up again. Now i am trying
the clonezilla method to downsize one of my
VM. I have created a smaller storage volume
and added to the VM. I boot up wih clonezilla
but have issue cloning the drive over. Should
I use Disk-Image or Device-Device?
To make it smaller, you
Well, I can tell you how I do it. Might help.
1) create a new storage volume of the size you want with Virtual Manager.
(Host detailsStorage tab)
2) shut down the VM and add the new volume to the VM ( it now has two
virtual drives - the original and the new)
3) boot with clonezilla,
You can't add a drive temporarily and have Virtual Manager create the new
volume there? I would think even a USB stick would work...
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I need to install a virtual machine acting as a virtual storage server
under CentOS 5.x (using kvm, xen, virtualbox or vmware).
Back when I started using virtual machines, I used guests to share large
storage.
Eventually, I found it was better to let the host do the sharing of storage,
and let
I once tried moving my qcow2 VM guest files to a zfs-fuse volume, and the
VMs refused to boot after. They only ran while on ext3 or ext4.
Although I wasn't trying at that time, I understand that in order migrate
VMs between servers, you need a shared file system.
Maybe NFS is the answer?
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
I don't suppose you have any websites you would recommend that shows how to
install and use spice?
Thanks..
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Unless you have old cards you have to retain, PCI-x isn't useful anymore.
Too slow.
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$ 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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I own a few headless centos servers running kvm. Vnc-server is probably
easiest to setup to access the server's desktop. Or use ssh if you don't
want a gui desktop on the server.
I use the ultravnc viewer on my windows PC to access centos.
Linux vm guests can run vnc as well, and windows vm
I can't say if KVM will see 6 or 12 cores as I don't run the same hardware.
It's easy enough to install centos and find out.
When you create a virtual machine in KVM, you assign virtual cpus to the
guest - from 1, to as many as you think the guest will need.
For performance reasons, I personally
The virtual network is great for connecting two or more virtual guests
directly. Its fast and doesn't add traffic to your physical lan.
If you have a virtual guest that gets a lot of traffic, then giving it its
own network card (nic) can help speed things up as well as keep the heavy
traffic
Do you use sata drives? Does your system support AHCI, and is that enabled in
the bios?
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That's interesting one. Can you run zttest (or dahdi_test) and provide
some results as for accuracy?
From my experience (with Xen mainly) I was getting somewhere between
60-80 % accuracy which is really, really bad.
Regards,
Bart
[]
/usr/sbin/dahdi_test
Unable to open dahdi interface: No such
[] 1. I wouldn't run asterisk in a vm if my life depended on it, tried many
times and it always came around sooner or later to remind me it didn't want
that malarkey.
jlc
[]
Trixbox CE runs perfectly as a centos kvm guest. And quite well with various
brands of sip phones. Only drawback is I
I think he's right. Run PostgreSQL on the centos host directly, rather than
from within a guest. The vm guests could access the database over the
virtual lan, so speed of access for guests on the same server wouldn't be an
issue.
There are lots of ways of file sharing for example. You can share
Place the gparted iso file somewhere you can access it from the VM. I would
recommend placing it on the Centos server that hosts the VM. I keep all my
ISO files in a folder named ISOs.
I run the gnome desktop on my servers, so I use VNC to remote control the
server. I would run the
At the same time on the same server? I don't see how.
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Oh, I see. That's the free version that runs on top of another OS, isn't it?
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NETMASK=255.255.255.255?
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I use the desktop and the virt manger gui to setup and install, so I get to
watch the boot…
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KVM seems to have a future in centos.
I have a couple of servers running kvm, with only 4 cores per server. I tend
use 1 real core for each virtual cpu assigned to the guests, because I don't
need that many guests. So, I can't speak to scaling...
Performance is excellent, however. It's been a
If you want to use 32bit host OS, then you only have one choice - Xen.
Yes... All software is 32 bits
I think he meant if you had a 32bit host to run the guests on, and did not
mean 32bit guests. If your hardware has virt extensions, then it's a 64bit
host.
KVM certainly runs 32bit and 64bit
Trying with their 32bit version, I get a kernel panic - not syncing : VFS
unable to mount root. This is on KVM using the default IDE emulator.
What kernel panic message are you getting?
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Well, I got slackware running. What a pain. When I first installed it, I had
booted the slackware iso on a test VM that had previously been running
centos. I told slackware to use the existing partitions, one of which was
LVM. That's what caused the kernel panic, I think.
During the installation
The KVM update below (RHBA-2010-0479) is now available with yum update
-Original Message-
From: centos-virt-boun...@centos.org [mailto:centos-virt-
boun...@centos.org] On Behalf Of David Martin
Sent: Wednesday, July 14, 2010 10:02 AM
To: Discussion about the virtualization on CentOS
I never work with that subnet so this may be a dumb thing to say, but isn't
the 255.255.254.0 mask giving you 510 hosts, so the broadcast address should
be higher than 255?
The guest is using br0?
-Original Message-
From: centos-virt-boun...@centos.org [mailto:centos-virt-
According to the manual for your motherboard supports it:
Intel Virtualization Technology (Available when supported by the CPU)
And according to Intel the cpu supports it. Make sure it's enabled in the
bios.
And it's my own opinion that there's no need email all your logs to the
world unless
Windows guests can use drivers to work directly with the virtual-hardware
devices that are presented to the guest. And since windows is acpi, etc.
aware, with the right settings it works almost as if its paravirtualized.
When installing, for me its easiest to d/l and store the .iso file for
I think he means cores. And XP will see and use 4 cores.
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I had to figure it out on my own with a lot of testing, and I'm sure there
are other ways to do things. But I found bridges to be the best way to go
for attaching to the lan or wan, and virtual nets are great for
guest-to-guest, or guest-to-server communication.
A bridge lets several guests share
Are these tools useful for KVM?
-Original Message-
From: centos-virt-boun...@centos.org [mailto:centos-virt-boun...@centos.org]
On Behalf Of David Hollis
Sent: Tuesday, May 18, 2010 5:23 AM
To: centos-virt@centos.org
Subject: [CentOS-virt] open-vm-tools 20100425 rpm
All,
I've updated
There was mention of some support for SPICE in RHEL 5.4, and mention again
of improved support in 5.5, but it sounds like their main goal is to
implement it in RHEV.
Is there an easy way to implement SPICE with 5.5? Or should I download the
source and compile it from spice-space.org?
Thanks...
I think iSCSI is easier to implement and is certainly fast, but I'm unclear
about the number of iSCSI clients that can access a volume (iSCSI target) at
the same time. So, I use it with only one client at a time.
-Original Message-
From: centos-virt-boun...@centos.org
a CD ISO and
from http repositories.
On Mon, Apr 26, 2010 at 4:53 PM, compdoc comp...@hotrodpc.com wrote:
Just curious as to what hardware you're running it on. And when you say
you've installed the necessary rpms, does this mean you installed KVM by
hand after the install, or through the installer
Just curious as to what hardware you're running it on. And
when you say you've installed the necessary rpms, does this
mean you installed KVM by hand after the install, or through
the installer when you first installed it?
From: centos-virt-boun...@centos.org
Ive seen this happen in some distros when the option
'UseDNS' is set to yes in the file sshd_config
Of course, there could be issues with your network setup as
well...
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My 2 cents:
When Red Hat picks a release of kernel, xen, kvm, etc., they
tweak, change, and test it until its 'enterprise' ready. If
they say you can run a business class server with it, I
believe them. Based solely on how well centos works.
Even though RHEL 5.4 doesn't have the newest of
64bit multi-vcpu. The guest is quite heavyweight, 30GB of
memory and
12vcpu. It's a LTSP server designed to handle lots of
graphical logins
for computer science students. This, I guess is not a
common workload.
--
Norman Gaywood, Computer Systems Officer
University of New England, Armidale, NSW
KVM works. I'm happy with it. But then I build servers with
6 guests or less for small businesses.
There are comparisons. They say KVM doesn't scale as well.
They say in some areas xen shines, and in some areas kvm
shines. But the comparisons are all from last year before
red hat released 5.4.
Fri 2/19/2010 Kenni Lund ke...@kelu.dk
Do your own testing if in doubt.
OK.
Hosts:
Centos 5.4 with kvm, and latest (yum) updates. The switch is
a 3com gigabit switch. These are production servers and each
has guests doing actual work, but the servers' cpus are idle
most of the time.
Guests:
I have both windows 7 and win 2008 installed as kvm guests,
but they were installed with the initial release of centos
5.4. And I have installed all updates since. I don't like
the virtio drivers, so I never use them. Are you having
issues?
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A bridge should take on the mac address of the hardware
device its sharing, and although I cannot see your ifcfg-
scripts it looks like you have that correct. But could you
post your ifcfg-br0 and the others?
One difference I can see is that you use the virtio model
nics in your guests and I
The mac address shouldn't change. Are you setting the mac
address of the guest to be the same as the host?
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- Neil Aggarwal n...@jammconsulting.com wrote:
Hello:
I am using kvm on a CentOS 5.4 server.
I am trying to install the TunkeyLinux Core appliance
found here: http://www.turnkeylinux.org/core
I downloaded the ISO file from the web site.
Then, I used this command to intall it:
From: Neil Aggarwal
Are you using bridged networking? I think it has something
to do with that as well as not having a DHCP server in
my network.
Actually, yes. I use a bridge to connect to the lan, where
guests obtain addresses thru DHCP, but I have no issues
assigning addresses by hand
-Original Message-
Fhttp://www.liveleak.com/view?i=375_1263347833rom:
centos-virt-boun...@centos.org
[mailto:centos-virt-boun...@centos.org] On Behalf Of Ben M.
Sent: Friday, January 15, 2010 8:56 AM
To: Discussion about the virtualization on CentOS
Subject: Re: [CentOS-virt] Xen Database
What, you use a term program to connect?
-Original Message-
From: centos-virt-boun...@centos.org
[mailto:centos-virt-boun...@centos.org] On Behalf Of
Karanbir Singh
Sent: Monday, January 04, 2010 6:44 PM
To: Discussion about the virtualization on CentOS
Subject: Re: [CentOS-virt] Xen box
Have you run memtest86+ on the system? Does the motherboard
support VM technology and is it enabled? Does the Intel
motherboard need a bios update?
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