May 2023 - Users - libvirt List Archives

Libvirt
by Gk Gk 26 Oct '23

26 Oct '23

Hi All, I am trying to collect memory, disk and network stats for a VM on kvm host. It seems that the statistics are not matching what the OS inside the VM is reporting. Why is this discrepancy ? Is this a known bug of libvirt ? Also I heard that libvirt shows cumulative figures for these measures ever since the VM was created. Also I tested by creating a new vm and comparing the stats without a reboot . Even in this case, the stats dont agree. Can someone help me here please ? Thanks Kumar

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issue about libvirtd: daemon can not start
by 王东亚 30 May '23

30 May '23

hi, I installed kmv on ubuntu-22.04-desktop-amd64, after installing some necessary package (qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virtinst), the libvirtd can not get start, actually, when I running systemctl start libvirtd.service, it'll run a little while (about 3 sec) and then it stops, or should I say it never start. I checked the status, it says ExecStart=/user/sbin/libvirtd $LIBVIRTD_ARGS (code=dumped, signal=TRAP) I processed journalctl -p err, it says ../../../glib/gmem.c:167 failed to allocate xxxxxxx bytes my laptop has 8G phycial memory any suggestion will be appricate. Best Regards.

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Question regaring correct usage of CPU shares
by mailing-libvirt＠posteo.de 26 May '23

26 May '23

Hi there, I have a question regarding the shares option of the cputune section. I want to illustrate my question with the following example. Let's assume I have two virtual machines like the following on four dedicated core with two threads each: VM1: <cputune> <shares>512</shares> <vcpupin vcpu="0" cpuset="0"/> <vcpupin vcpu="1" cpuset="4"/> </cputune> VM2: cputune> <shares>512</shares> <vcpupin vcpu="0" cpuset="1"/> <vcpupin vcpu="1" cpuset="5"/> <vcpupin vcpu="2" cpuset="2"/> <vcpupin vcpu="3" cpuset="6"/> <vcpupin vcpu="4" cpuset="3"/> <vcpupin vcpu="5" cpuset="7"/> </cputune> Those two virtual machines I just mentioned won't interfere with one another since they are pinned to different cores. However I introduce another, third virtual machine, like this: VM3: <cputune> <shares>512</shares> <vcpupin vcpu="0" cpuset="0"/> <vcpupin vcpu="1" cpuset="4"/> <vcpupin vcpu="2" cpuset="1"/> <vcpupin vcpu="3" cpuset="5"/> <vcpupin vcpu="4" cpuset="2"/> <vcpupin vcpu="5" cpuset="6"/> <vcpupin vcpu="6" cpuset="3"/> <vcpupin vcpu="7" cpuset="7"/> </cputune> What I want is that VM1, VM2 and VM3 all receive half of the cores CPU time if congestion appears. My question is how the shares are calculated. Are they calculated on a per core basis? Meaning VM1 and VM3 use the first core so each will get half of the cores capacity when congestion appears, or are the shares calculated over all cores a virtual machine uses and I need to scale the amount of shares with increasing number of cores. What is the correct setting here so that all virtual machines in this example are guaranteed half of the capacity of each of their respective cores if congestion appears? Thank you.

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Cron jobs not working with virsh commands
by Jeff Brown 26 May '23

26 May '23

Recently, while testing backup scripts, I happened to notice that 'virsh snaphot-create-as . . .' has been failing with 'error: failed to get domain '$DOMAIN'' when run through crontab. So I've been unwittingly backing up the live, running, QCOW2 images for quite some time because scripts which run fine when testing from CLI, fail to work as expected when run as a cron job. After much searching, I stumbled upon a related issue with the (obvious?) simple solution almost hidden in the answers. You have to explicitly connect to the local server with, e.g.: virsh -c qemu:///system snapshot-create-as . . . Humble apologies if I missed something I should have been aware of, but I just thought it worthwhile mentioning here for anyone else searching for an answer in the archives. Best regards, Jeff

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fails to start @boot - service-start-limit-hit
by lejeczek 24 May '23

24 May '23

Hi guys. When I login to the system I find: UNIT LOAD ACTIVE SUB DESCRIPTION ● virtproxyd.service loaded failed failed Virtualization daemon ● virtproxyd-admin.socket loaded failed failed Libvirt proxy admin socket ● virtproxyd-ro.socket loaded failed failed Libvirt proxy local read-only socket ● virtproxyd-tls.socket loaded failed failed Libvirt proxy TLS IP socket ● virtproxyd.socket loaded failed failed Libvirt proxy local socket only 'virtproxyd-tls.socket' is enabled -> $ journalctl -l -o cat -u virtproxyd-tls.socket virtproxyd-tls.socket: Failed with result 'service-start-limit-hit'. Closed Libvirt proxy TLS IP socket. But any use of 'virtproxyd-tls.socket' from that point on, is successful - VM migrates to/from okey. I think pcs/pacemaker cluster plays a role in it for it must be - I'm guessing - trying to migrate a single VM back to booting-up node, though.. 'resource-agents-deps.target' is told to 'After=virtproxyd-tls.socket', among other 'after' bits. To confirm this suspicion - I put the node into 'standby' then I reboot and I get none of those failures mentioned above. & to make it an utterly curious test case - all these 'failures' only started after the node was remove from IPA domain ! If I make the node again a client/member of IPA (same as before) domain then - standby or not - all those services above fail @boot no more! I'd be very glad to read suggestions/thoughts you can share. many thanks, L.

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Adding custom xml:ns to definitions for additional application
by Darragh Bailey 19 May '23

19 May '23

Hi, I'm looking at adding support to vagrant-libvirt to add some additional XML to the network definitions it creates following https://libvirt.org/formatnetwork.html#general-metadata assuming the metadata element is to be treated the same as what is listed for domains https://libvirt.org/formatdomain.html#general-metadata (app metadata isn't explained What I was wondering is if there are any expectations around the URI used? Or recommendations? I was hoping to use http://vagrant-libvirt.github.io/v1/network as it's at least under control of the maintainers. However I wasn't planning to publish anything there unless that is needed? Reason behind this is that I want to annotate networks created and managed by vagrant-libvirt so that teardown can be safely done without accidentally destroying networks that have been manually created. As well as allowing CI systems that might have multiple agents running on the same host to be able to safely create and destroy machines with network definitions in parallel with any attempts to remove a network that has just been created being prevented without networks ending up persisting forever. https://github.com/vagrant-libvirt/vagrant-libvirt/issues/1738 summaries what I'm hoping to do. -- Darragh Bailey "Nothing is foolproof to a sufficiently talented fool"

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Invalid value '-1' for 'cpu.max': Invalid argument - a result of?
by lejeczek 17 May '23

17 May '23

Hi guys. In hope that an expert read this - what is, can be, the below a result of? 12284 still running (86040) Invalid value '-1' for 'cpu.max': Invalid argument 12284 still running (86035) 12284 still running (86030) this is a snippet from libvirtd logs which is a consequence of what ovirt's engine setup is doing. To troubleshoot ansible playbooks which is what engine setup does, as I understand it, would be an impossible task for me so I reckoned I should try this end. many thanks, L.

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<qemu:commandline> ignored ?
by lejeczek 16 May '23

16 May '23

Hi guys. I have a domain definition with this: ... <qemu:commandline> <qemu:arg value='-fw_cfg'/> <qemu:arg value='name=opt/com.coreos/config,file=/00-VMs/oshift1node.ign'/> </qemu:commandline> </domain> at the bottom of xml. 'virsh' creates domain a okey but in VM I do not see ignition happened - it's fedora coreos - and when I dumpxml running domain, then indeed those bits, show above, are not there. I'd grateful for any/all thoughts shared on - what is not/happening there. Is there something else which is a prerequisite to 'qemu:commandline' but if yes and I'm missing those, why would not then 'virsh' and/or 'virtqemud' say something? many thanks, L.

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Re: PHP API
by Michal Prívozník 15 May '23

15 May '23

On 5/11/23 20:19, Simon Fairweather wrote: > Hi Michal, > > Would you be able to add, if there is a process you follow I can look at > creating merge requests. > > Regards > Simon > > int virDomainBlockPull (virDomainPtr > <https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainPtr> dom, > const char * disk, > unsigned long bandwidth, > unsigned int flags) > > > int virDomainBlockCopy (virDomainPtr > <https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainPtr> dom, > const char * disk, > const char * destxml, > virTypedParameterPtr > <https://libvirt.org/html/libvirt-libvirt-common.html#virTypedParameterPtr> params, > int nparams, > unsigned int flags)intvirDomainBlockPull (virDomainPtr > <https://libvirt.org/html/libvirt-libvirt-domain.html#virDomainPtr>dom, > > > On Wed, May 3, 2023 at 12:42 PM Michal Prívozník <mprivozn(a)redhat.com > <mailto:mprivozn@redhat.com>> wrote: > > On 4/30/23 20:29, Simon Fairweather wrote: > > Hi Michal > > > > Are there plans to implement snapshot create_as version of the > > following function where XML could be passed? > > Honestly, there are no plans for libvirt-php. I maintain it in my spare > time and implement features as somebody requests them. Let me implement > it. And also fix the issue you've filled earlier this week. > > Michal > Posted as: https://gitlab.com/libvirt/libvirt-php/-/merge_requests/39 Michal

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Windows Guest on KVM running "single core" after windows update
by Benjammin2068 11 May '23

11 May '23

Hey all, I have a Windows 10 pro (64bit) long time running as a libvirt/KVM guest that I think Windows Update finally narfed. The hardware is a supermicro motherboard with dual Intel E5-2640 CPUs for a total of 40 threads and 64GB The guest is allocated 2sockets, 5cores, 2 threads and 32GB of RAM. (I've also tried 1 socket, 20 cores, 1 thread and 1s10c2t -- no help) In an SSH session to the linux host (CentOS7 - up to date), htop shows 1 core pegged and abnormal distribution of load (like it used to) even with fun little tools in Windows like the PowerToy -> CPUStress64.exe (i.e. the head CPU will show 90-99% and next thread in HTOP will show like 10% which then trails off to like 5%) Even if I tell CPUStress64.exe to load up 10 or 15 threads worth of 100%. Has anyone else seen this? Thanks, -Ben

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