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1612 discussions

Reminder: Virt SIG meeting on #centos-devel tomorrow, 2pm GMT
by George Dunlap 17 Nov '14

17 Nov '14

Just a reminder everyone, we'll be having our biweekly Virt SIG meeting Tuesday at 2pm GMT, on IRC, channel #centos-devel on freenode. If you have any particular items you'd like to put on the agenda, please let me know. Lars will be on a plane to China at that point, so I'll be chairing the meeting. -George

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Re: [CentOS-virt] Official AWS AMIs: eu-central-1 support?
by Paul Schyska 14 Nov '14

14 Nov '14

Are the build scripts for the AMIs available somewhere? At least we could build them ourselves. Alternativly, maybe someone of the cloud group can build an AMI and share it as public AMI? We want to use Centos 7 too, and a migrated Image of mine refuses to start in eu-central-1. Thanks, Paul Schyska

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Official AWS AMIs: eu-central-1 support?
by Axel S 13 Nov '14

13 Nov '14

Hello all, and thank you very much for the Centos 7 HVM AMI [1], greatly appreciated! This AMI does not work on the newly launched AWS Frankfurt region (eu-central-1). Any plans for fixing that? According to the AWS announcement [2], "The Region supports all sizes of T2, M3, C3, R3, and I2 instances". (We'll be running the CentOS 7 HVM AMI going forward, but looks like none of the other AMIs works on eu-central-1 either.) [1] https://aws.amazon.com/marketplace/pp/B00O7WM7QW [2] http://aws.amazon.com/blogs/aws/aws-region-germany/ Best, Axel

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Xen Project Test Day for 4.5 RC2 on Thursday, Nov 13
by Russell Pavlicek 11 Nov '14

11 Nov '14

Since the folks on this list work with integrating Xen Project on CentOS, we'd like you to be aware of the upcoming Xen Project 4.5 RC2 Test Day. This Thursday, November 13, is our second Test Day for the 4.5 release cycle. Release Candidate 2 is now available for assessment. Information about testing this release can be found here: http://wiki.xenproject.org/wiki/Xen_4.5_RC2_test_instructions To learn more about Test Days, check out: http://wiki.xenproject.org/wiki/Xen_Project_Test_Days Russ Pavlicek Xen Project Evangelist, Citrix Systems Home Office: +1-301-829-5327 Mobile: +1-240-397-0199 UK VoIP: +44 1223 852 894

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Test new xen, centos-release-xen and kernel for auto grub update on kernel install
by Johnny Hughes 22 Oct '14

22 Oct '14

The new process for auto updates of grub upon kernel install is in the xen4centos testing repo. In order to test these as updates to an existing system, you can do this: 1. download the test repo file: http://dev.centos.org/centos/6/xen-c6-RC1/xen-c6-RC1.repo 2. Put it in /etc/yum.repos.d/ 3. Issue this command: yum --disablerepo=Xen4CentOS upgrade xen\* centos-release-xen (that should install all the new files required to make the kernel update work automatically) 4. Review the new file /etc/sysconfig/xen-kernel ... if there is any other items you want on the 'kernel /xen.gz' line, you would edit the file. For example, I like to add 'com1=115200,8n1 console=com1' to the end of that line so I can use consoles in virsh. So I would change the line: XEN_KERNEL_MBARGS="--mbargs=dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all" to XEN_KERNEL_MBARGS="--mbargs=dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all com1=115200,8n1 console=com1" (both of those should be one line if they wrap) This is also where you can assign more or less memory to the dom0. etc. This article has some other possible parameters for the xen.gz line: http://www.informit.com/articles/article.aspx?p=1187966&seqNum=4 5. Make sure this is set as well in /etc/sysconfig/xen-kernel: BOOT_XEN_AS_DEFAULT="yes" 6. issue this command to upgrade the kernel: yum --disablerepo=Xen4CentOS upgrade kernel-\* 7. This should upgrade your kernel and it should also automatically update your /boot/grub/grub.conf to boot for dom0 use. If, for some reason, you want to manually upgrade the grub.conf file yourself, set the BOOT_XEN_AS_DEFAULT to "no" instead of yes. 8. If you want to install the xen kernel in other places other than xen dom0 machines, just make sure not to install the xen package, and grub.conf will get standard and not xen kernel boot entries. ==================== Once ypu have done your updates, please delete /etc/yum.repos.d/xen-c6-RC1.repo =================== Please report positive and negative experiences here so we can move this into the CentOS-6 xen4 repository (or fix things that are broken). Thanks, Johnny HUghes

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Reminder: Virt SIG meeting on IRC today, 2pm BST
by George Dunlap 21 Oct '14

21 Oct '14

Just a reminder to everyone, we'll be having our bi-weekly meeting on IRC this week, #centos-devel, at 2pm BST. Feel free to e-mail any agenda items you'd like to have covered. One thing I'd like to discuss a bit this week is blktap2 -- at the moment we're using a 2-year-old snapshot of XenServer's blktap2 fork (aka "blktap2.5"). At some point the whole project needs to figure out a better way to deal with this; so I'd like to ask what CentOS needs to get from blktap, so we can come up with the best solution. -George

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Domain Controllers virtualized KVM
by Andry Michaelidou 16 Oct '14

16 Oct '14

Hello to you all! We are implementing here at the University KVM virtualization for our servers and services and i was wondering if anyone virtualized domain cotrollers to KVM. Does anyone done this before? Any advice? -- 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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virsh list hangs / guests not starting automatically
by Matt Garman 14 Oct '14

14 Oct '14

I followed the wiki[1] to create a KVM virtual machine using bridged network on CentOS 6.5. It seemed to work fine on initial setup. (FWIW I'm trying to run a MythBuntu guest.) However, after a reboot, it doesn't auto-start the VMs. Shortly after boot, if I go into "virsh", then do a "list", it just hangs. Likewise, if I go into "virt manager", it just hangs with the message "connecting". Kernel version is: 2.6.32-431.29.2.el6.x86_64 Relevant package versions: libvirt.x86_64 0.10.2-29.el6_5.12 libvirt-client.x86_64 0.10.2-29.el6_5.12 libvirt-python.x86_64 0.10.2-29.el6_5.12 python-virtinst.noarch 0.600.0-18.el6 virt-manager.x86_64 0.9.0-19.el6 virt-top.x86_64 1.0.4-3.15.el6 virt-viewer.x86_64 0.5.6-8.el6_5.3 qemu-img.x86_64 2:0.12.1.2-2.415.el6_5.14 qemu-kvm.x86_64 2:0.12.1.2-2.415.el6_5.14 CPU is a Xeon E3-1230v3. I have the virtualization setting enabled in the BIOS. I googled on this, and saw a bunch of talk about two years ago regarding issues with the libvirt packages having a deadlock bug. But I think the versions of the relevant packages that I have installed are new enough to have fixes for that. I also happened across an earlier post to this list[2], where it seemed someone was having a similar problem. I was previously attempting to use balance-rr and 802.3ad bonding modes on my host. However, I just changed to using "active-backup" and the problem remains. I have in /etc/libvirt/libvirtd.conf the following three lines (the rest is stock, i.e. all comments): log_level = 2 log_filters="" log_outputs="1:file:/var/log/libvirt/libvirt.log" Below I posted the contents of the libvirt log file after doing a "service libvirt start". Anyone ever fought this before? Thanks! [1] http://wiki.centos.org/HowTos/KVM [2] http://lists.centos.org/pipermail/centos-virt/2014-March/003722.html /var/log/libvirt/libvirt.log output: 2014-10-14 16:47:11.150+0000: 4657: info : libvirt version: 0.10.2, package: 29.el6_5.12 (CentOS BuildSystem <http://bugs.centos.org>, 2014-09-01-13:44:02, c6b8.bsys.dev.centos.org) 2014-10-14 16:47:11.150+0000: 4657: info : virNetlinkEventServiceStart:517 : starting netlink event service with protocol 0 2014-10-14 16:47:11.151+0000: 4657: info : virNetlinkEventServiceStart:517 : starting netlink event service with protocol 15 2014-10-14 16:47:11.154+0000: 4668: info : dnsmasqCapsSetFromBuffer:667 : dnsmasq version is 2.48, --bind-dynamic is NOT present, SO_BINDTODEVICE is NOT in use 2014-10-14 16:47:11.157+0000: 4668: info : networkReloadIptablesRules:1925 : Reloading iptables rules 2014-10-14 16:47:11.157+0000: 4668: info : networkRefreshDaemons:1287 : Refreshing network daemons 2014-10-14 16:47:11.278+0000: 4668: info : networkStartNetwork:2422 : Starting up network 'default' 2014-10-14 16:47:11.290+0000: 4668: info : virStorageBackendVolOpenCheckMode:1085 : Skipping special dir '.' 2014-10-14 16:47:11.290+0000: 4668: info : virStorageBackendVolOpenCheckMode:1085 : Skipping special dir '..' 2014-10-14 16:47:11.352+0000: 4668: info : qemudStartup:754 : Unable to create cgroup for driver: No such device or address 2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 : Configured cgroup controller 'cpu' 2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 : Configured cgroup controller 'cpuacct' 2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 : Configured cgroup controller 'cpuset' 2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 : Configured cgroup controller 'memory' 2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 : Configured cgroup controller 'devices' 2014-10-14 16:47:11.353+0000: 4668: info : qemudLoadDriverConfig:411 : Configured cgroup controller 'blkio' 2014-10-14 16:47:11.509+0000: 4668: info : virDomainLoadAllConfigs:14696 : Scanning for configs in /var/run/libvirt/qemu 2014-10-14 16:47:11.527+0000: 4668: info : virDomainLoadAllConfigs:14696 : Scanning for configs in /etc/libvirt/qemu 2014-10-14 16:47:11.527+0000: 4668: info : virDomainLoadAllConfigs:14718 : Loading config file 'mythbuntu.xml' 2014-10-14 16:47:11.529+0000: 4668: info : qemuDomainSnapshotLoad:484 : Scanning for snapshots for domain mythbuntu in /var/lib/libvirt/qemu/snapshot/mythbuntu

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problem with xen virtulization on centos 6.5
by moslem mosadegh 13 Oct '14

13 Oct '14

I have a .img file and it's config xml file that i downloaded from a website. I installed xen 4.2 on my centos 6.5. when i want to create a new domain for my .img file with this xml file with this command: "virsh create wiki.xml". that give me an error message:"unkonw os type xen". anyone know what's the problem?

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Automate running grub-bootxen.sh for kernel installs in Xen4CentOS
by Johnny Hughes 09 Oct '14

09 Oct '14

We need a way to do two things to /usr/bin/grub-bootxen.sh in Xen4CentOS. 1. Automate running it if xen (the package) and the xen kernel are installed. But only if the user WANTS to run it. 2. Allow users to automatically modify the variables passed into the xen.gz line (that is, more or less memory, add console settings, etc.) If you look at the current script, "--mbargs=dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all" is hard coded in as the only option for the xen.gz line. While doing that we also still want to preserve the ability to run that kernel in other places than just for xen dom0 setups. Here is how I propose we do that. Currently the /usr/bin/grub-bootxen.sh file is in centos-release-xen ... that is a good place as it allows us to use a different file in different major versions of CentOS (so the file in 7 can be different than the file in 6, but still use the same auxiliary files, etc). So, what we can do is setup a file in /etc/sysconfig/ (probably from the xen package) that we call xen-boot or xen-kernel, etc. In this file we put some variables like these: BOOT_XEN_AS_DEFAULT="yes" XEN_KERNEL_MBARGS="--mbargs=dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all" Then we look for that file (/etc/sysconfig/xen-boot) as a post-install from the xen kernel. If the file exists, we source it ... an if BOOT_XEN_AS_DEFAULT is yes, and if /usr/bin/grub-bootxen.sh exists we run it passing in XEN_KERNEL_MBARGS as a variable. The user can set BOOT_XEN_AS_DEFAULT to no if they want, so they do not get a xen kernel entry in their grub config. That should mean that if either there is no '/etc/sysconfig/xen-boot' config file OR if '/usr/bin/grub-bootxen.sh' does not exist, we get only the standard kernel entry .. but if they do exist, we also get a user modifiable xen.gz kernel entry as well. Also, we should likely use the centos-release-xen package to handle the '/etc/sysconfig/xen-boot' file as well, since it already has the /usr/bin/grub-bootxen.sh script. Thoughts?

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