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Re: [libvirt-users] Using virsh blockcopy -- what's it supposed to accomplish?
by Gary R Hook 24 Dec '14

24 Dec '14

On 12/23/14 2:08 PM, Eric Blake wrote: > On 12/23/2014 11:35 AM, Gary R Hook wrote: >> On 12/22/14 4:50 PM, Eric Blake wrote: >>> On 12/22/2014 03:27 PM, Gary R Hook wrote: >>>> I am experimenting with the blockcopy command, and after figuring out >>>> how to integrate qemu-nbd, nbd-client and >>>> dumpxml/undefine/blockcopy/define/et. al. I have one remaining question: >>>> >>>> What's the point? >>> >>> Among other uses, live storage migration. >> >> There is so very much to say here, but I will endeavor to be brief and >> to the point. Please note that I am working with libvirt 1.2.2, as >> stated in my OP. And up front; I'm pretty sure I'm missing data points >> and working from a position of ignorance and unreasonable expectation. > > Did you mean for this to go to the list? Usually, having discussions > like this in public archives will benefit more people, and allow others > to chime in. > > https://rwmj.wordpress.com/2010/11/08/want-help-dont-email-me-directly/ Dang, dang, dang, dang, dang. Yes, of course I did. *sigh*. Will resend to the list. Please ignore. -- Gary R Hook Senior Kernel Engineer NIMBOXX, Inc

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[libvirt-users] "virsh list" does not show anything after reboot [newbie]
by Kevin Wilson 24 Dec '14

24 Dec '14

Hi, libvirt users and gurus, I am a newbie to visualization, hope this question is not too silly, please bear with me. I had installed three guest on Fedora 21 with the virt-install tool, by: virt-install --name=f21_x86_64_guest --file=/var/lib/libvirt/images/guest.qcow2 --cdrom /workStorage/work/down/f21/Fedora-Live-Workstation-x86_64-21-5.iso --ram=2048 virt-install --name=f21_x86_64_guest1 --file=/var/lib/libvirt/images/guest.qcow2 --cdrom /workStorage/work/down/f21/Fedora-Live-Workstation-x86_64-21-5.iso --ram=2048 --force virt-install --name=f21_x86_64_guest2 --file=/var/lib/libvirt/images/guest.qcow2 --cdrom /workStorage/work/down/f21/Fedora-Live-Workstation-x86_64-21-5.iso --ram=2048 --force When runing "virsh list" I see these three guests as running. Now, I rebooted the machine, and "virsh list" does not show anything. It turned out that running "systemctl status libvirtd" showed some error (about some NFS path which was not found), and once I fixed that, I restarted the libvirtd, and this time running "systemctl status libvirtd" showed that it is running OK. Yet, runnig "virsh list" does not show anything Any ideas ? what I should do to run one of these guest I created before booting the machine ? Regards, Kevin

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[libvirt-users] why CPU pinning doesn't take effect when using lxc-enter-namespace to run an application
by WANG Cheng D 23 Dec '14

23 Dec '14

Dear all, I want my container to run on the third CPU core and I define this by the following xml scrpits: <vcpu placement="static" cpuset="3">1</vcpu> When I run my application in a container terminal, I can see the application runs on the third core as expected. When I run my application using lxc-enter-namespace, the CPU pinning doesn't take effect, i.e., the application runs on a core which isn't the third one. How can I solve this problem? Any replies are highly appreciated. Cheng

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[libvirt-users] Device attach event
by Marek Marczykowski-Górecki 23 Dec '14

23 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 20 Dec '14

20 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 20 Dec '14

20 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 20 Dec '14

20 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 18 Dec '14

18 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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