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[libvirt-users] RHEL6 cgroup error after a few days of uptime
by Dax Kelson 13 Dec '12

13 Dec '12

I have a RHEL6 that hosts many kvm virtual machines. It has been working fine for a couple years. I apply errata updates about once a week. In the last couple weeks, I've ran into a bug where the virtual machines start failing to start with a cgroup error message. If I reboot the host (very disruptive) then things start working normaly for a few days. Can I configure qemu/libvirt not to use cgroups at all as a temporary workaround? How would I do that? Here is example of trying to start a vm (that hasn't been started since boot) after the problem manifests itself. [root@virthost ~]# find /cgroup | grep r04s14 [root@virthost ~]# virsh start r04s14 error: Failed to start domain r04s14 error: Unable to create cgroup for r04s14: No such file or directory [root@virthost ~]# find /cgroup | grep r04s14 /cgroup/cpu/libvirt/qemu/r04s14 /cgroup/cpu/libvirt/qemu/r04s14/cpu.rt_period_us /cgroup/cpu/libvirt/qemu/r04s14/cpu.rt_runtime_us /cgroup/cpu/libvirt/qemu/r04s14/cpu.stat /cgroup/cpu/libvirt/qemu/r04s14/cpu.cfs_period_us /cgroup/cpu/libvirt/qemu/r04s14/cpu.cfs_quota_us /cgroup/cpu/libvirt/qemu/r04s14/cpu.shares /cgroup/cpu/libvirt/qemu/r04s14/cgroup.event_control /cgroup/cpu/libvirt/qemu/r04s14/notify_on_release /cgroup/cpu/libvirt/qemu/r04s14/cgroup.procs /cgroup/cpu/libvirt/qemu/r04s14/tasks /cgroup/cpuacct/libvirt/qemu/r04s14 /cgroup/cpuacct/libvirt/qemu/r04s14/cpuacct.stat /cgroup/cpuacct/libvirt/qemu/r04s14/cpuacct.usage_percpu /cgroup/cpuacct/libvirt/qemu/r04s14/cpuacct.usage /cgroup/cpuacct/libvirt/qemu/r04s14/cgroup.event_control /cgroup/cpuacct/libvirt/qemu/r04s14/notify_on_release /cgroup/cpuacct/libvirt/qemu/r04s14/cgroup.procs /cgroup/cpuacct/libvirt/qemu/r04s14/tasks [root@virthost ~]#

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[libvirt-users] oVirt workshop coming up - January 22-24 2013
by Dave Neary 13 Dec '12

13 Dec '12

Hi everyone, I thought that some of you might be interested to hear about an upcoming event I'm helping put together, an oVirt workshop in NetApp HQ in Sunnyvale, California on January 22-24. oVirt is (as I'm sure most of you know) a management system for KVM-based virtualization - allowing you to easily handle VMs, network, storage and hosts in a virtual datacenter. The workshop's three day agenda will cover installation and use of oVirt, integrating with oVirt though the platform's APIs, and contributing to development of the project. This is an excellent opportunity to find out what's coming in future versions of RHEV, and to meet users who are on the bleeding edge of what we will be shipping in future products. Reserve your spot at this free event by registering at http://ovirtnetapp2013.eventbrite.com/, and see http://www.ovirt.org/NetApp_Workshop_January_2013 for more information. We are actively seeking presenters who can talk about interesting ways in which they are using oVirt, or share integration stories. Please send proposals for talks to workshop-pc(a)ovirt.org - the official end of the call for content is Friday 14th of December, 23:59 PST, but since we will not be drafting the schedule until next week, any proposals received by Monday will also be considered. Thanks! Dave. -- Dave Neary - Community Action and Impact Open Source and Standards, Red Hat - http://community.redhat.com Ph: +33 9 50 71 55 62 / Cell: +33 6 77 01 92 13

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[libvirt-users] CentOS 6.3 LXC guest with CentOS 6.3 host
by Ajey Gore 13 Dec '12

13 Dec '12

I have been struggling with LXC libvirt driver. I created LXC container fs from "yum install" with install root option. After that edited few files and created special nodes rm -f /dev/null mknod -m 666 /dev/null c 1 3 mknod -m 666 /dev/zero c 1 5 mknod -m 666 /dev/urandom c 1 9 ln -s /dev/urandom /dev/random mknod -m 600 /dev/console c 5 1 mknod -m 660 /dev/tty1 c 4 1 chown root:tty /dev/tty1 mkdir -p /dev/shm chmod 1777 /dev/shm mkdir -p /dev/pts chmod 755 /dev/pts basically all instructions from here http://wiki.1tux.org/wiki/Centos6/Installation/Minimal_installation_using_y… My configuration looks like this <domain type='lxc'> <name>c03</name> <memory unit="G">4</memory> <os> <type>exe</type> <init>/sbin/init</init> </os> <vcpu>1</vcpu> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/srv/libvirt-1.0.0/src/libvirt_lxc</emulator> <filesystem type='mount'> <source dir='/srv/guest/c03'/> <target dir='/'/> </filesystem> <interface type='network'> <mac address='52:54:00:00:00:01'/> <source network='default'/> <target dev='vnic-c03'/> <model type='virtio'/> </interface> <console type='pty' /> </devices> </domain> I compiled libvirt from source. MY container comes up fine but I get init: tty (/dev/tty1) main process ended, respawning init: tty (console) respawning too fast, stopped also, I can't login as root, because it say /dev/pts/0 is not safe, but if I add a normal user with chroot and then I login, it works perfectly. So in this case, after init stops everything, I can't get rc.local to execute and in turn can't get ip address and other configurations up and running. help? -- Thanks Ajey

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[libvirt-users] Networking problem on virtualized pfSense firewall
by Lorenzo Milesi 13 Dec '12

13 Dec '12

Hi. I've a strange problem with networking and a KVM virtualized pfsense firewall. My hw host is Ubuntu 12.04 fully updated, with two bridges br0 (LAN) and br1 (WAN). pfSense is a KVM guest with the two interfaces in virtio mode. When I run pfSense as fw, the host doesn't seem capable of doing tcp connections outside. I can ping any internal and exernal host, but when I try telnetting 25 or 80 outside it won't work. Every other host in the LAN can surf and make every kind of connection outside and inside, just the host cannot. At fist I thought it was a pfSense problem, because if I run another VM guest with another firewall the host can connect, but what makes me think it's a host networking issue is that with this other FW I experience other weird problems, like not being able to connect to the physical host when connected via VPN. I double checked iptables and there's no block, everything is accepted. KVM setup is pretty much the ubuntu default. Any idea? thanks -- Lorenzo Milesi - lorenzo.milesi(a)yetopen.it GPG/PGP Key-Id: 0xE704E230 - http://keyserver.linux.it

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[libvirt-users] Support for on-demand USB pass through
by Felicitus 12 Dec '12

12 Dec '12

Hi, I'm trying to use USB pass through with devices that are not present at the VM startup. However, when starting the machine, libvirt complains that the USB device doesn't exist. I was following the guide at [1], but this doesn't seem to work on Debian Wheezy. Any hints how to achieve that? Thanks, Felicitus [1] http://david.wragg.org/blog/2009/03/usb-pass-through-with-libvirt-and-kvm.h…

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[libvirt-users] error creating multipath storage pool
by Maxim Titov 11 Dec '12

11 Dec '12

Hi I'm using Gentoo Linux, libvirt-1.0.0, qemu-1.1.2-r3, multipath-tools 0.4.8-r1. After defining a new storage pool with pool-edit <poolname>: <pool type="mpath"> <name>mpath</name> <target> <path>/dev/mapper</path> </target> </pool> I get this: internal error missing backend for pool type 7 USE flags for libvirt package are: caps elibc_glibc iscsi libvirtd lvm lxc macvtap nfs nls python qemu udev vepa -audit -avahi -debug -firewalld -numa -openvz -parted -pcap -phyp -policykit -rbd -sasl -selinux -uml -virt-network -virtualbox -xen) What is wrong and what is the right way to map SAN LUN's to guest using multipath?

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[libvirt-users] online course for libvirt
by Arindam Choudhury 10 Dec '12

10 Dec '12

Hi, It will be very helpful for novice user like me if libvirt developers consider organizing an online course for libvirt using platform like coursera or edx. Thanks

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[libvirt-users] Configuration file question
by David Mitchell 10 Dec '12

10 Dec '12

Where are the configuration files for libvirt and/or virsh actually stored? It seems that most of them are in /etc/libvirt but identical copies are also found in /var/lib/libvirt. In my case I am having issues with the network/default.xml file being different. Is there a reason why the config seems to be in two places at once? And which one is the 'correct' one? -David Mitchell ----------------------------------------------------------------- | David Mitchell (mitchell(a)ucar.edu) Network Engineer IV | | Tel: (303) 497-1845 National Center for | | FAX: (303) 497-1818 Atmospheric Research | -----------------------------------------------------------------

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Re: [libvirt-users] Libvirt problem with KVM from source
by Ekrem Sonmemis 10 Dec '12

10 Dec '12

Hi, Does your custom KVM binary (source compiled ?) run properly ? Have you test it ? Yes indeed, it compiles fine and works exactly as I wish. The only problem occurs after I try to add libvirt to the custom KVM. Regards, Ekrem

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[libvirt-users] Libvirt problem with KVM from source
by Ekrem Sonmemis 10 Dec '12

10 Dec '12

Dear List, I have installed a custom KVM on my Ubuntu 12.04 which I sometimes use. I would like to use it with libvirt, so I used apt-get to install libvirt, virt-viewer and virtinst. I can start virsh after installation and it says it is version 0.9.8, but once I get to trying to install a VM with virtinst, I get the error message: ERROR Host does not support any virtualisation options If I install KVM using apt-get the exact same instruction works, so perhaps the problems occurs with the custom KVM due to the configuration of the KVM install but I'm afraid I can't figure it out. I would really like to make it work with the custom KVM rather than the packaged version. I install the custom KVM at the prefix /usr/local/kvm, but I don't change anything else. Could this have anything to do with it? Thanks for reading. Regards, Ekrem

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