October 2015 - Users - libvirt List Archives

[libvirt-users] GUEST Memory statistics secret revealed ...
by Jean-Pierre Ribeauville 30 Oct '15

30 Oct '15

Hi, I'm wondering how to explain following metrics I got from libvirt, regarding memory stats for the two GUESTS running on my host. 1) virDomainGetXMLDesc() shows these values : memmax (1024000.000000) memcurrent(1024000.000000) memmax (2048000.000000) .memcurrent(2048000.000000) 2) As values returned by virDomainMemoryStats(), I got these values : VIR_DOMAIN_MEMORY_STAT_ACTUAL_BALLOON: active_balloon (1024000.000000) active_balloon (2048000.000000) VIR_DOMAIN_MEMORY_STAT_RSS: rss(1194195.312500) rss(2039269.531250 3) By using cgroup counters "memory.usage_in_bytes" for both Guests, I got these values : memusage (1 207 207 031 250) memusage (2 834 503 906 250) How is it possible to have a balloon size equal to memcurrent ? What "memory.usage_in_bytes" stands for (it's the maximum value of the three metrics I got for each GUEST) ? FYI , I use a 1.2.8 libvirt. Thanks. Reagrds, J.P. Ribeauville P: +33.(0).1.47.17.20.49 . Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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[libvirt-users] failed to pivot job for disk vdc
by Nerijus Baliunas 30 Oct '15

30 Oct '15

Hello, I did a virsh snapshot-create-as --domain meta sn1 --diskspec vda,file=/var/lib/libvirt/images/meta-sn1.qcow2 --disk-only --atomic --no-metadata Then I successfully blockcommitted 2 disks: virsh blockcommit meta vda --active --verbose --pivot virsh blockcommit meta vdb --active --verbose --pivot But when doing virsh blockcommit meta vdc --active --verbose --pivot I got: Block commit: [100 %]error: failed to pivot job for disk vdc error: block copy still active: disk 'vdc' not ready for pivot yet Domain snapshot sn1 created And now it looks like this: virsh domblklist meta Target Source ------------------------------------------------ vda /var/lib/libvirt/images/meta.qcow2 vdb /var/lib/libvirt/images/meta-home.qcow2 vdc /var/lib/libvirt/images/meta-pgsql.sn1 How do I make vdc to be the initial disk, not the snapshot one? Regards, Nerijus

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[libvirt-users] How to retrieve legacy cgroups location ?
by Jean-Pierre Ribeauville 29 Oct '15

29 Oct '15

Hi, As told in "Control Groups Resource Management" libvirt page : Legacy cgroups layout Prior to libvirt 1.0.5, the cgroups layout created by libvirt was different from that described above, and did not allow for administrator customization. Libvirt used a fixed, 3-level hierarchy libvirt/{qemu,lxc}/$VMNAME which was rooted at the point in the hierarchy where libvirtd itself was located. So if libvirtd was placed at /system/libvirtd.service by systemd, the groups for each virtual machine / container would be located at /system/libvirtd.service/libvirt/{qemu,lxc}/$VMNAME. In addition to this, the QEMU drivers further child groups for each vCPU thread and the emulator thread(s). This leads to a hierarchy that looked like I'm trying to retrieve this layout : $ROOT | +- system | +- libvirtd.service | +- libvirt | +- qemu | | | +- vm1 | | | | | +- emulator | | +- vcpu0 | | +- vcpu1 | | | +- vm2 | | | | | +- emulator | | +- vcpu0 | | +- vcpu1 | | | +- vm3 | | | +- emulator | +- vcpu0 | +- vcpu1 How may I find where systemd has placed libvirtd ? I use libvirt 0.10.2 on a RHEL6 2.6.32-431.el6.x86_64 Thx for help. J.P. Ribeauville P: +33.(0).1.47.17.20.49 . Puteaux 3 Etage 5 Bureau 4 jpribeauville(a)axway.com<mailto:jpribeauville@axway.com> http://www.axway.com<http://www.axway.com/> P Pensez à l'environnement avant d'imprimer.

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[libvirt-users] virsh can't support VM offline blockcommit
by justlibvirt＠gmail.com 29 Oct '15

29 Oct '15

Hi everyone! I use the libvirt(version: 1.2.2) and QEMU(version: 2.2.1) to test qemu snapshot features: I tried virsh blockcommit when VM offline, the virsh blockcommit failed: the error messase as below: error: Requested operation is not valid: domain is not running when I start the VM, the virsh blockcommit work fine! my question is：we need virsh support blockcommit when VM offline。how do？ we test qemu snapshot as follows： we need create snapshot of the cycle，and by virsh blockcommit merge snapshot chain，but when VM offline， the virsh blockcommit will fail， someone suggest me：when VM offline，may use qemu-img commit to submit snapshot turn，but qemu-img can't modify snapshot chain backing relation，it need we use qemu-img rebase amend snapshot‘s backingfile， the main question is when we use qemu-img rebase modify snapshot's backingfile, if someone start the VM, it will may lead to VM filesystem readonly。 we should how to solve the question? thanks! justlibvirt(a)gmail.com

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[libvirt-users] How to find memory utilization percent of kvm guest?
by suyog jadhav 28 Oct '15

28 Oct '15

I currently use following approach but its failing Find Max memory using following API vdgiRet = virDomainGetInfo(domPtr, infoPtr); memTotal = infoPtr->memory; Find current utilization using following API rVal = virDomainMemoryStats (domPtr, memStats, VIR_DOMAIN_MEMORY_STAT_NR, 0) ; for (i = 0; i < rVal; i++) { if (memStats[i].tag == 7) memUsed = memStats[i].val; } Which is the value of "VIR_DOMAIN_MEMORY_STAT_RSS = 7" Then I calculate util as (memUsed/memTotal) But the value of memUsed exceeds value of memTotal by small amount resulting in memUtil to be around 101 %. I understand that VIR_DOMAIN_MEMORY_STAT_RSS is Resident Set Size of the process running the domain. How do I Calculate the current memory utilization using alternate way?

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[libvirt-users] How can I set the advertised value of MTU for virbr0 interface?
by George Trakatelis 26 Oct '15

26 Oct '15

Hi all, I want to set the advertised value of MTU for virbr0 interface on a Fedora 21 host to 1454 to accommodate the installation of new VMs for testing purposes. The aforementioned host is an OpenStack VM actually, which explains the need for a lower than 1500 MTU. I noticed Pieter Hollants' patch to set dhcp-option=<number>,"<value>" for an interface, but it seems that it has not been implemented yet. Is there a possibility to have such an option? George

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[libvirt-users] net.ipv4.conf.all.forwarding
by lejeczek 22 Oct '15

22 Oct '15

hi everybody I'd like to ask how libvirtd influences net.ipv4.conf.all.forwarding, would you know? I've noticed that if I use host's bridge, therefor there is no <forward mode= > in my network then "net.ipv4.conf.all.forwarding" goes back to 0. Is this intended I wonder? Looks like libvirt decides it's user responsibility now. many thanks

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[libvirt-users] openvz driver
by Volker Janzen 22 Oct '15

22 Oct '15

Hi, I've a question regarding the openvz driver. I noticed that the virsh dumpxml output does not contain the memory settings. E.g.: <domain type='openvz'> <name>104</name> <uuid>ad2e9d0b-d242-482a-8640-5102e49d0f9b</uuid> <memory unit='KiB'>0</memory> <currentMemory unit='KiB'>0</currentMemory> <vcpu placement='static'>2</vcpu> <os> <type>exe</type> <init>/sbin/init</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>destroy</on_reboot> <on_crash>destroy</on_crash> <devices> </devices> </domain> Can someone explain why this data is missing? As far as I know the driver reads the container configuration files, which contains the missing information. Regards Volker Viele Grüße Volker

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[libvirt-users] noVNC with qemu over ssh
by Digimer 22 Oct '15

22 Oct '15

Hi all, I have a little webserver interface for managing VMs running on a RHEL 6 based HA cluster hosting KVM/qemu VMs. I'd like to use noVNC to provide access to the hosted VMs, but I am not finding much information on how to do this (or rather, I can't find it in the large number of ovirt related posts). Has anyone done this or could someone point me in the right direction to docs on how to do this? Trying to even get direct access isn't getting me far (/usr/bin/novnc_server --vnc localhost:5900 -> click URL -> enter password, hangs on "Starting VNC handshake"). Thanks! PS - while testing, iptables and selinux are disabled... I'm trying to get a most basic setup working -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?

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[libvirt-users] Libvirt from source problem
by Muhammad Asif 21 Oct '15

21 Oct '15

Hi Geeks, When I install libvirt from source, there is no libvirtd. how can i start or restart libvirt deamon. Moreover it give some permission error. What issue can be. Thanks

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