virt March 2009

virt@lists.centos.org

16 participants
13 discussions

kmod-kvm-2.6.18-92.1.18.el5-72-1.x86_64.rpm outdated, need on for 2.6.18-92.1.22.el5
by Michael Schenck 28 May '09

28 May '09

CentOS Virt, I'm looking for an RPM for the kmod-kvm processor specific modules (kvm-intel or kvm-amd). I've been using L. Farkas's repository, but after the recent kernel updates, I'm out of luck. Best Regards, Michael Schenck

4 7

Backing up a running KVM guest
by Julian Price 27 Mar '09

27 Mar '09

Hello This new HowTo explains how to backup a VM without powering it down. It's specifically aimed at KVM although it may work with any virtualization software that uses Linux as the host. Please review it and let me know what you think, particularly if you are already doing something similar yourself, or would like to. Do you have answers to any of the questions in the 'Questions' section? It has not been released yet and it's a first draft, so break it to me gently... http://wiki.centos.org/HowTos/BackupKVMGuest (The article's internal Wiki links are broken - not sure what's going on there, but ignore that) A taster... 1. Introduction This article explains how to backup a virtual hard disk to a remote location, even while it is use. One advantage of running software in a virtual machine is that the entire disk can be backed up in one go, including Operating System, software, configuration files, registry, permissions, data and all. Re-establishing a system after a failure is therefore quicker and more reliable than re-installing software and restoring data. The method employs LVM to take a snapshot of the guest disk and then uses rsync to update changes to a previous backup on a remote server. If there is a database server on the guest then it is flushed & locked at the point the snapshot is taken. This method came into use around 2008 following wider availability and awareness of virtualization software, cheaper faster network bandwidth, and cheaper bigger disks. ... Thanks, Julian

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Tips for installing Fedora 10 32bit Xen PV domU/guest on CentOS 5.3 dom0/host
by Pasi Kärkkäinen 24 Mar '09

24 Mar '09

Hello! Xen and related packages (libvirt, virt-install, virt-manager etc) in Upcoming CentOS 5.3 support running and installing Fedora 10 (and Fedora 11) paravirtual domU guest virtual machines. These upstream fixes (new features) make it possible: "RHEL5.3 xen: include support for booting Fedora 10 DomU (i.e. bzImage support)" https://bugzilla.redhat.com/show_bug.cgi?id=457199 "update virtinst to install f10 xen guests" https://bugzilla.redhat.com/show_bug.cgi?id=460585 But beware there's a bug in 32bit x86 Fedora 10 installer (anaconda). It installs wrong kernel to the domU (it should install kernel-PAE but it installs normal kernel), and that will prevent the domU from starting after installation. Xen only supports PAE kernels for 32bit PV guests. It's this bug: "anaconda installs the wrong kernel for i686 xen guests" https://bugzilla.redhat.com/show_bug.cgi?id=470905 It can be "fixed" by using a kickstart file for installation, which forces installation of kernel-PAE instead of normal kernel. Example of such kickstart: http://pasik.reaktio.net/fedora/f10-xen-domu-ks.cfg Fedora 11 (current rawhide of 2009-03-24) does not have that bug anymore, so paravirtual F11 Xen PV domU installation should work out-of-the-box. I've tested and verified all the above works. Hopefully that helps someone :) -- Pasi

1 0

Re: [CentOS-virt] ConVirt 1.0 released
by jd 23 Mar '09

23 Mar '09

Yes. /Jd --- On Sun, 3/22/09, Hristo Benev <foxb(a)abv.bg> wrote: > From: Hristo Benev <foxb(a)abv.bg> > Subject: Re: [CentOS-virt] ConVirt 1.0 released > To: centos-virt(a)centos.org > Date: Sunday, March 22, 2009, 5:20 AM > > > >Message: 1 > >Date: Fri, 20 Mar 2009 11:04:39 -0700 (PDT) > >From: jd > >Subject: [CentOS-virt] ConVirt 1.0 released. > >To: centos-virt(a)centos.org > >Message-ID: > >Content-Type: text/plain; charset=us-ascii > > > > > >hi > > Just wanted to bring to your > attention the release of ConVirt 1.0. > > http://www.convirture.com/blog/2009/announcements/convirt-goes-10/ > > > >/Jd > > > > > > > > Is that an open source tool? > > >From first look on the site i have the impression that > it is paid tool?! > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt(a)centos.org > http://lists.centos.org/mailman/listinfo/centos-virt >

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Re: [CentOS-virt] ConVirt 1.0 released
by Hristo Benev 22 Mar '09

22 Mar '09

> >Message: 1 >Date: Fri, 20 Mar 2009 11:04:39 -0700 (PDT) >From: jd >Subject: [CentOS-virt] ConVirt 1.0 released. >To: centos-virt(a)centos.org >Message-ID: >Content-Type: text/plain; charset=us-ascii > > >hi > Just wanted to bring to your attention the release of ConVirt 1.0. > http://www.convirture.com/blog/2009/announcements/convirt-goes-10/ > >/Jd > > > Is that an open source tool? >From first look on the site i have the impression that it is paid tool?!

1 0

ConVirt 1.0 released.
by jd 20 Mar '09

20 Mar '09

hi Just wanted to bring to your attention the release of ConVirt 1.0. http://www.convirture.com/blog/2009/announcements/convirt-goes-10/ /Jd

1 0

Windows Server 2008 with the KVM --no-acpi option
by Julez 19 Mar '09

19 Mar '09

KVM version 84 Host OS: Centos version: 2.6.18-92.el5 Guest OS: Windows Server 2008 Web Processor: Intel Xeon L5420 Quad-Core I have installed kvm version 84 from .rpm's on lfarkas.org. Without the --no-acpi option, Windows 2008 boots fine. With the --no-acpi option, the VM displays the following: Windows Boot Manager Windows failed to start... Status 0xc0000225 Info: Windows failed to load because the firmware (BIOS) is not ACPI compatible I heard that for best performance, the -no-acpi option is recommended. Maybe that's only an issue with other versions of Windows/KVM. Can anyone confirm? Assuming -no-acpi is worth persuing, is there a solution? Is it a known issue? I couldn't find many references on the web. I downloaded & compiled the latest kernel version 2.6.28.7 from kernel.org and I think the -no-acpi option worked but I've wiped the machine now so can't confirm. Do I need to install a kernel patch and if so which one? This is the kvm command-line... /usr/bin/qemu-kvm -no-acpi -k en-gb -m 1024 -monitor stdio -usb -usbdevice tablet -net nic,macaddr=52:54:00:12:34:58 -net tap,script=/etc/incharge/qemu-ifup -vnc :1 -hda /media/vm01/vm01-hda.raw -hdb /media/archive/vm01-hdb.raw ...although any variant with -no-acpi fails, including the installing from the .iso... /usr/bin/qemu-kvm -no-acpi -m 1024 -vnc :1 -cdrom "/media/archive/win2008web-trial.iso" -boot d /media/vm01/vm01-hda.raw For anyone else wanting to know how to install KVM version 84, this worked for me: yum remove kvm yum install zlib-devel alsa-lib-devel SDL-devel gnutls-devel dev86 texi2html glibc-devel.i386 rpm -i -v http://www.lfarkas.org/linux/packages/centos/5/x86_64/etherboot-roms-kvm-5.… rpm -i -v http://www.lfarkas.org/linux/packages/centos/5/x86_64/kmod-kvm-84-1.x86_64.… rpm -i -v http://www.lfarkas.org/linux/packages/centos/5/x86_64/kvm-84-1.x86_64.rpm reboot Before I post this solution under my original forum post... http://www.centos.org/modules/newbb/viewtopic.php?topic_id=19034&forum=38 ...is this the recommended method for running KVM 72+? According to this... http://www.linux-kvm.org/page/Guest_Support_Status ...KVM version 72 is required for Windows Server 2008. CentOS ships with KVM 36 and the testing repositories have version 66 - and that's only provided as source: http://dev.centos.org/centos/5/testing/SRPMS/. Maybe the KVM HowTo could be updated for anyone with the misfortune to require Windows Server 2008: http://wiki.centos.org/HowTos/KVM Thanks, Julez

3 2

xen-3.0.3-80.el5
by Shane Goulden 18 Mar '09

18 Mar '09

When will Xen-3.0.3-80.el5 be available for CentOS 5.2? https://rhn.redhat.com/errata/RHBA-2009-0118.html

2 2

VMWare Server 2 USB permissions
by Ted Miller 17 Mar '09

17 Mar '09

I have experienced the problems with trying to use USB in VMWare Server 2.0. I have read in various places that it involves the settings of some permissions in the /proc file system, but most of the information has been of the "check your permissions on /proc/bus/usb", but nothing to tell what they should be, or what the ownership of the "file" should be, or how to keep them set correctly (I believe that Centos "forgets" those permissions every time it is rebooted). Can anyone tell me: What the permission needs to be? Who has to have it? How can I set it automatically? I would prefer to create a group and assign ownership of the "file" to a group (like usbbus), and then assign users to that group as needed. The applications I am needed USB access to are running under desktop OS installs, not servers. Thanks for any help, Ted Miller Indiana, USA

1 0

Xen 3.3.1 on CentOS 5.2 - networking problem with bond
by Chris Brown 13 Mar '09

13 Mar '09

Hi, I'm new to the list and new to Xen, so please be gentle with me! ;-) I've got a CentOS 5.2 x86_64 machine with two interfaces (eth0 and eth1 unsurprisingly) bonded into bond0 in mode 4, and a Cisco switch set up with LACP to suit. I didn't select Xen at install time as I wanted to install Xen 3.3.1 from the gitco repo. After installing and yum updating, I added the gitco repo and gid a groupinstall Virtualization. No problem, Xen 3.3.1 installed on CentOS 5.2 and rebooted OK. I disabled Xen networking, and manually added my own bridge device, br0 and moved my IP address off bond0 and onto br0. I applied the patch from Bugzilla which changes the network startup order so that bond interfaces will join bridges properly. I enabled ip routing. Rebooted again to test, and all works - I can ssh the dom0 on the br0 IP address. I used virt-install to try and install a domu direct from the mirrorservice repo for CentOS 5.2 and the domu is created, console attches and the initrd downloads and runs. Anaconda starts and asks me for language, and IP details. I select manual ipv4 config, no ipv6, enter the ipv4 address I want the domu to have, subnet mask and gateway, and a DNS server address, and select Ok. Anaconda says "Determining host name and domain..." and after a couple of minutes or so, tells me I can ping the address I gave the domu from the dom0 and from the next hop (the default gateway for dom0 and domu - another Linux host acting as a firewall) and I get replies to both. Both see the same MAC address for the dom0 ip address - starting with 00:16:36:xx:xx:xx. On my dom0, if I tcpdump on bond0 for host <domuaddress>, all I see is arp entries - dom0 address asking who has domu address and domu address asking who has gateway address and arp replies. No traffic, even though I can ping the domu from the default gateway (ie outside the physical dom0 host). Any pointers to where I'm going wrong? It's pretty obvious to me that it is a network issue of some kind, I just don't know what... I guess I could try a HVM domu booted from cd-rom with a Knoppix or similar Live CD so I can test networking? Thanks, Chris

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virt March 2009