December 2014 - Users - libvirt List Archives

[libvirt-users] Device attach event
by Marek Marczykowski-Górecki 22 Dec '14

22 Dec '14

Hi all, I'm trying to use libvirt events API, but I can't find what event is fired when some device (disk in this case) got attached to the domain. In the docs I see only VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED, but not VIR_DOMAIN_EVENT_ID_DEVICE_ATTACHED. Is there some event for that? BTW libxl driver implements only VIR_DOMAIN_EVENT_ID_LIFECYCLE, but that's another story... -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?

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[libvirt-users] Virtual machine removal through command line.
by Le Bris Gilles 20 Dec '14

20 Dec '14

Hi, Until today, I hadn't found a way to cleanly remove a KVM virtual machine through command line on CentOS 6 or 7! I had to run 'systemctl restart libvirtd' or 'service libvirtd restart' After several months (!!!), I found this thread: https://github.com/pradels/vagrant-libvirt/issues/107 Now, I know how to cleanly remove a KVM virtual machine (with default file location): virsh destroy vm.example.com virsh undefine vm.example.com --managed-save /bin/rm /var/lib/libvirt/images/vm.example.com.img /bin/rm /var/log/libvirt/qemu/vm.example.com.log virsh vol-delete /var/lib/libvirt/images/vm.example.com.img --pool default I don't know if the last command ('virsh vol-delete' avoiding the libvirtd restart) is a bug or a feature but it must be documented! Only a libvirt developer can guess something like this. Feel free to change my instructions in any way you think it's better but at least document this in a public place (http://wiki.libvirt.org for example). Regards.

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[libvirt-users] LVM storage
by Boylan, Ross 19 Dec '14

19 Dec '14

Hi. I have some narrow questions and a larger one. If I make an existinig LVM VG a storage pool, can I use some of the LV's for libvirt and some for the host? Or does the VG needed to be completely dedicated to virtualization? Assuming mixed use is possible, is it possible to do an LVM snapshot of an LV in use for a VM? The snapshot would have to be initiated and used on the host, I assume. How dynamic is this? If I create a new LV, is it possible to see that immediately from, e.g., virt-manager and add it as a virtual disk to a running VM? If I resize the LV, will the VM know so that, e.g., I could do an online resize of the filesystem? My larger question is what the recommendations are for managing disks or LV's with libvirt and KVM on Linux. In particular, I'd like to be able to grow storage space as the the VM needs grow, and snapshot (in the LVM sense) some of the block devices behind filesystems for backup. Although it would be nice to grow space while the VM's are running, it's not a requirement. Following advice on the KVM list, I have been using raw LV's as virtual disks for the VM's. The host is currently running with a large, encrypted LVM VG. It would be convenient to use it for the VM's.

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[libvirt-users] virsh list shows no vm after downgrade
by Chengyuan Li 19 Dec '14

19 Dec '14

Hi, I was running libvirt 1.2.2 and qemu 2.0 which are from icehouse cloud archive repo on ubuntu 12.04, "virsh list --all" showed correct instances after launching several VMs, Then I just downgraded libvirt to 0.9.13 and qemu to 1.0, but kept the VMs running. However, when I run "virsh list --all" after downgrade, I can't see any VMs. Seems that the old version libvirt 0.9.13 doesn't know the instances created by libvirt 1.2.2. Does anyone know how to solve this problem? Regards, Chengyuan.

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[libvirt-users] virsh list shows no vm after downgrade
by Chengyuan Li 19 Dec '14

19 Dec '14

Hi, I was running libvirt 1.2.2 and qemu 2.0 which are from icehouse cloud archive repo on ubuntu 12.04, "virsh list --all" showed correct instances after launching several VMs, Then I just downgraded libvirt to 0.9.13 and qemu to 1.0, but kept the VMs running. However, when I run "virsh list --all" after downgrade, I can't see any VMs. Seems that the old version libvirt 0.9.13 doesn't know the instances created by libvirt 1.2.2. Does anyone know how to solve this problem? Regards,Chengyuan.

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[libvirt-users] detachFlags permissions and ownership
by Martin Polednik 18 Dec '14

18 Dec '14

Hello everyone, I would like to ask why detachFlags doesn't change the ownership/permissions of /dev/vfio/XX in order to be readable (possibly writable, is that required?). Is there any way to accomplish this without custom udev rules/scripts or is it handled only when using "managed=yes" mode for 'hostdev' type devices? Regards, mpolednik

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[libvirt-users] Again with same Cgroup issue :)
by mad Engineer 17 Dec '14

17 Dec '14

Hello All, From the last couple of days i have been spamming this mailing list with request for configuring Cgroup with libvirtd on Centos systems. I still can not find a permanent solution to limit host RAM to particular value,tried creating a separate hierarchy "mykvm" and changed in sysconfig/libvirtd after that vm's memory cgroup reflects this.But it is not obeying "memory.limit_in_bytes" set in "mykvm" group,i als specified it in cgrules.conf and restarted it.If i change that in "/cgconfig/memory/mykvm/libvirt/qemu/memory.limit_in_bytes " its working.But that is dynamic as i am not able to find a way to mention that in "cgconfig.conf". How can i make sub hierarchies follow what is set in parent cgroup? eg: if change variables in "/cgconfig/memory/mykvm" then all instances coming under "/cgconfig/memory/mykvm/libvirt/qemu/" should follow that value..How is it possible.Can you please help

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[libvirt-users] How to use blockcopy in libvirt-java
by Star Guo 16 Dec '14

16 Dec '14

Hi, ALL, I just look for the class and method to use blockcopy in libvirt-java on this page: http://libvirt.org/sources/java/javadoc/ However, I can not find out. Libvirt-java Support blockcopy ? Thanks. Best Regards, Star Guo

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[libvirt-users] C group hierarchy and libvirtd
by mad Engineer 15 Dec '14

15 Dec '14

On Centos 6.4 x64,with libvirt-0.10.2-18.el6.x86_64 i am trying to set "memory.limit_in_bytes" for all qemu process. changed "cgconfig.conf" group mygroup{ perm { admin { uid = root; gid = root; } task { uid = qemu; gid = kvm; } } memory { memory.limit_in_bytes = 61G; } } and also added "CGROUP_DAEMON=memory:/mygroup" in sysconfig/libvirtd and in cgrules.conf and then restarted services. Now i can see created virtual machines use cgroup hierarchy "/cgroup/memory/mygroup/libvirt/qemu/virtualmachine1/" instead of "/cgroup/memory/libvirt/qemu/virtualmachine1/". The issue is "memory.limit_in_bytes" set to "mygroup" is getting applied only to libvirtd process.VM are not following memory.limit_in_bytes set to "mygroup". 1. how can i set this globally so that all virtual machines follow that, i dont want to create a new group for that if libvirt supports it. 2.Is there any way i can avoid extra hierarchy and create virtual machines memory cgroup under "/cgroup/memory/kvm/" instead of "/cgroup/memory/mygroup/libvirt/qemu/" ? please help me fix this issue.I have this working on ubuntu servers where i specified "libvirt-qemu" user and VMs follow that cgroup for memory. Regards,

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[libvirt-users] Difficulty configuring Cgroups on redhat/centos
by mad Engineer 14 Dec '14

14 Dec '14

Hello All, i am trying to set "memory.limit_in_bytes" for all process created by libvirt.But i am not able to achieve this on RHEL systems in Ubuntu servers creating memory cgroup for "libvirt-qemu" user solves the issue.But in case of RHEL system i tried to create a group by editing "cgconfig.conf" and then changing cgrules.conf and restarted cgconfig and libvirtd but still virtual machines are not following what is mentioned in config,instead they follow cgroup libvirt/qemu/virtualmachine-name ,is there any way i can set global cgroup values for all process rather editing each process configuration or how can i configure libvirt to use new configuration file and use that group instead of default libvirt/qemu/ cgroup. /etc/cgconfig.conf mount { cpuset = /cgroup/cpuset; cpu = /cgroup/cpu; cpuacct = /cgroup/cpuacct; memory = /cgroup/memory; devices = /cgroup/devices; freezer = /cgroup/freezer; net_cls = /cgroup/net_cls; blkio = /cgroup/blkio; } group kvm { perm { admin { uid = root; gid = root; } task { uid = qemu; gid = kvm; } } memory { memory.limit_in_bytes = 61G; } } and this on cgrules.conf qemu memory kvm Thanks for your help

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