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[libvirt-users] Cannot save domain
by Tony Arnold 06 Apr '17

06 Apr '17

I have a domain running a Windows 10 system on an Ubuntu 16.10 host system. The domain has 4096MiB of memory. When I try to save the domain, or managedsave the domain, I get an error when it's about 96% complete. The terminal session looks like this: virsh # save Windows10 windows10-20170402.save --bypass-cache --verbose Save: [ 95 %]error: Failed to save domain Windows10 to windows10- 0170402.save error: operation failed: domain is not running It seems the domain closes before the save has completed. libvirt is at version 2.1.0 Should I submit this as a bug, or is there something I can change to fix this? Regards, Tony. -- Tony Arnold MBCS, CITP | Senior IT Security Analyst | Directorate of IT Services | G64, Kilburn Building | The University of Manchester | Manchester M13 9PL | T: +44 161 275 6093 | M: +44 773 330 0039

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[libvirt-users] creating a lxc image to be used with libvirt-lxc
by Spike 06 Apr '17

06 Apr '17

Dear all, I'm moving my first baby steps with libvirt-lxc trying to convert over from an LXD installation and one of the hurdles is putting together an image. All the examples I found about libvirt-lxc refer to running /bin/sh in a container, almost as if it was docker, as opposed to run a "full system" like I've been doing with lxd. Also virt-install, often referred in libvirt docs, seems to be specific/only for kvm. Can anybody point me to any documentation to achieve the same as you'd do with lxd? would it even just work to use those images ( https://cloud-images.ubuntu.com/) with libvirt? Last but not least, is there any way to "publish" a modified image so that I could make changes to any of the above and then reuse the modified one as a base for other containers? thank you, spike

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[libvirt-users] libvirt-lxc: good for production?
by Spike 04 Apr '17

04 Apr '17

Dear all, I'm a happy lxc (lxd) user with a need to add a bunch of KVM images to the mix. More importantly I need to have some simple frontend to give users the ability to quickly run some VMs for testing. Researching the topic brought me to virt-manager and from there libvirt. I've had however a hard time to answer a few questions that I hope this list can help me with: 1) is the libvirt-lxc driver actively developed? there's been a lot of upgrades to lxc and there seems to be relatively little activity on the lxc driver 2) is libvirt-lxc to be used in production to begin with? every single guide I found about libvirt pretty much points to KVM usage, with simple /bin/sh examples with lxc. Furthermore stuff like virt-install seems to be exclusively catered to full os/KVM images creation, with no obvious way to create a container image. thanks for any input, even just docs I missed that explain the avove would be most helpful. Spike

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[libvirt-users] (Live) Migration safe vs. unsafe
by Michael Hierweck 03 Apr '17

03 Apr '17

Hi all, virsh checks whether a (live) migration is safe or unsafe. When a migration is considered to be unsafe it is rejected unless the --unsafe option is prodivided. As a part of those checks virsh considers the cache settings for the underlying storage resources. In this context only cache="none" is considered to be safe. I wonder why cache="directsync" might be harmfull as it bypasses the host page cache completely. Regards, Michael

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[libvirt-users] migrated RHEL7/CentsOS7 VMs fail to boot
by Daniel Pocock 03 Apr '17

03 Apr '17

I migrated a CentOS7 VM (the fedrtc.org site) from an XCP environment to a libvirt/KVM environment. This involved using qemu-img to convert the image from VHD to qcow2 and then using virt-install --import to define the VM in libvirt. Three problems occurred during boot: a) on the first boot, the BIOS screen and grub screen don't appear at all, the screen is blank for a couple of seconds and then the message about loading a kernel appears. Hard reset and on the second and subsequent attempts I see the grub screen and have the opportunity to interact with it. This actually happened with many of my VMs, not just the CentOS7 VM. b) with console=hvc0 in the grub config, the kernel refused to boot, no error appeared on the screen. I was able to remove that easily enough by pressing "e" in grub. Rather than halting, should the kernel fall back to VGA perhaps when the console= argument is not valid? Or could KVM emulate the Xen console device to make migrations easier? c) after that, the boot proceeds up to about the point where I see systemd messages about starting basic system. Then it sits there for a few minutes and then these messages appear: warning: dracut-initqueue timeout - starting timeout scripts and after that I see "A start job is running for dev-mapp...oot.device (X min Ys/ no limit) Rebooting and choosing the "rescue" image from the bottom of the grub menu got me past that, I was able to log in and then I ran: dracut --kver 3.10.0-514.10.2.el7.x86_64 --force and on the next attempt it was able to boot successfully. The block device for the root FS is an LVM volume (so the name should have been constant) and the block device for the /boot filesystem listed in /etc/fstab was mounted by UUID (the block device name itself changed from xvda1 (XCP) to vda1 (KVM)). All my Debian VMs were able to cope with this device name changing. The CentOS7 system was originally installed using default settings for just about everything. Why does dracut need to be re-run in this situation? Should a bug report be filed about this?

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[libvirt-users] different bios file per guest
by Anton Gorlov 31 Mar '17

31 Mar '17

Can I set different bios file per guest? For some guest need UEFI. By default using bios-256k.bin

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[libvirt-users] libvirt + lxc + cgroups mounting
by Pyles, Andy 23 Mar '17

23 Mar '17

All, Within: https://libvirt.org/drvlxc.html#cgroups it mentions that : “/sys/fs/cgroup/NNNN the host cgroups controllers bind-mounted to only expose the sub-tree associated with the container” In my environment, the host contains: $ls –l /sys/fs/cgroup/ cpu -> cpu,acct cpu,cpuacct cpuacct -> cpu,cpuacct cpuset debug devices freezer memory net_cls systemd - but on my LXC container, I have only: $ls –l /sys/fs/cgroup memory -- How do I add additional host cgroup controllers to the set which is bind-mounted within the container? Thanks, Andy Pyles

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[libvirt-users] libvirtd firewalld support
by Leon Goldberg 23 Mar '17

23 Mar '17

Hey, I've been wondering about the extent libvirt makes use of firewalld. I'm looking to use firewalld exclusively and wonder about the ports libvirt takes care of for me via firewalld (e.g. will console/vnc ports, qemu migration ports, etc, will be handled for me?) I have only done a little bit of testing, but it seems like I can't connect to a vm via vnc without explicitly opening ports beforehand. Thanks, Leon

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[libvirt-users] Memory statistics for a domain
by Szczerbik, PrzemyslawX 22 Mar '17

22 Mar '17

Hi, I'm wondering whether there is any difference between VIR_DOMAIN_MEMORY_STAT_ACTUAL_BALLOON and 'memory' member from virDomainInfo structure. Based on the documentation those values should correspond to current balloon and memory used by the domain respectively. Is it always the case that those values will be equal? Is there a reason why maximum memory allowed ('maxMem' from virDomainInfo structure) cannot be retrieved from virDomainMemoryStats API? It seems that it's required to call 2 different APIs to get all memory metrics for a domain. Regards, Przemek -------------------------------------------------------------- Intel Research and Development Ireland Limited Registered in Ireland Registered Office: Collinstown Industrial Park, Leixlip, County Kildare Registered Number: 308263 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.

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[libvirt-users] Running virConnectGetCapabilities / virsh capabilities without a daemon or KVM
by Richard W.M. Jones 22 Mar '17

22 Mar '17

For virt-p2v we want to get the host CPU model, topology etc, and the best way we found to do that was to pull it from libvirt capabilities[1]. Since libvirt is already parsing the host CPU information, and because /proc/cpuinfo is such a stupid format to parse, this is very convenient. Unfortunately it doesn't work unless libvirtd _and_ KVM are both installed. Without libvirtd installed: # virsh capabilities error: failed to connect to the hypervisor error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory With libvirt-daemon installed, but not QEMU: # virsh capabilities error: failed to connect to the hypervisor error: no connection driver available for <null> I feel I should be able to fiddle with the connection URI in some way to make this possible, at least in the second case. However there's not a concept of "no hypervisor", and I couldn't find any other way to make it work. Using "test:///default" seems tempting, but it substitutes some imaginary host (i686) so that's no good. Installing KVM isn't really an option for us since we are trying to build a minimal bootable ISO. Just installing qemu-system-x86_64 pulls in half the world. (Even installing libvirtd is difficult, and we'd prefer to avoid it). Any ideas? Rich. [1] https://github.com/libguestfs/libguestfs/commit/963d6c3be7cd91c0373f67cfdd9… -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW

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