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[libvirt-users] Is there a way to disable libvirt qemu monitor while creating kvm vm using virsh?
by Min Du 12 Nov '14

12 Nov '14

Hi, Now for some reason, I need to add “ -qmp tcp:127.0.0.1:1235” when creating a KVM VM using libvirt. This command meaning in “qemu-kvm --help” is: -qmp dev like -monitor but opens in 'control' mode. I added command-line equivalent options into the xml file, like below format: <qemu:commandline> <qemu:arg value="-s"/> <qemu:arg value="-qmp"/> <qemu:arg value="tcp:127.0.0.1:1235"/> </qemu:commandline> However when I create VM using this xml file, I got the error: # virsh create instance-libvirt.xml error: Failed to create domain from instance-libvirt.xml error: internal error process exited while connecting to monitor: qemu-kvm: -qmp tcp:127.0.0.1:1235: Duplicate ID 'monitor' for mon duplicate chardev: monitor The VM I created, without “—qmp” option, has below options showing in “ps aux | grep qemu-kvm”: -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/vmifs_test.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control Looks like libvirt automatically adds the monitor options upon VM creation. Is there a way to disable this and use “—qmp” instead when creating VM? Thanks for your help. Best Regards, Min

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[libvirt-users] TCP or TLS Connection error
by Ajitha Robert 12 Nov '14

12 Nov '14

Hi all i am using libvirt 1.2.0 with xen hypervisor 4.4.. I am facing error while remotely connecting other libvirt using TCP or TLS. I couldnt make libvirt to listen to the port.. I installed libvirt from source in debian. I enabled --listen option by uncommenting LIBVIRTD_ARGS="--listen" /opt/libvirt-1.2.1/daemon/libvirtd.sysconf .. I killed the current libvirt. and started the daemon again.. when i gave ps aux | grep libvirtd the listen is not enabled.. Pls guide me -- *Regards,Ajitha R*

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[libvirt-users] net passthrough (hostdev) and external DNS problem - libvirt host claims DNS update
by lejeczek 11 Nov '14

11 Nov '14

hi everybody I'm having I pretty regular setup, so I'd like to think. Guest network is to use passthrough and a DNS+DHCP on a neighbour system gets requests and then DHCP updates DNS records but with libvirt host's name instead of guest's. Am I missing something here? How do make a guest claim DNS update and the not host on which that guest is running? many thanks P.

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[libvirt-users] Post upgrade/s issues with xen, libvirt, and virt-manager.
by Willie Hein WJ3G 11 Nov '14

11 Nov '14

Greetings, I've been suffering from some problems after upgrading my system, and not once but twice. I've been posing my findings in the vender's forum https://forums.opensuse.org/showthread.php/502307-openSUSE-13-1-gt-13-2-upg…. On there you will also find a link to findings of the first upgrade. Maybe you've seen these errors, or have ideas on what's missing in my config. Any help would be greatly appreciated. Willie

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[libvirt-users] migrate works for xen4.4?
by Ajitha Robert 11 Nov '14

11 Nov '14

Hi all, i m using xen 4.4.0 as hypervisor with libvirt 1.2.0. When i tried with migrate command i m facing certain issues.. I need to ensure whether libvirt supports xen 4.4? -- *Regards,Ajitha R*

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[libvirt-users] hvm in xen via libvirt.
by cool dharma06 10 Nov '14

10 Nov '14

hi all, i am using libvirt-1.2.5. i launched my VM(pv) in xen. its worked. But when i tried to launch HVM its not able to launch. i am facing some error. Please suggest me some solutions. thanks& regards, cooldharm06 ..:)

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[libvirt-users] php api binding for setting interface link flags (up/down).
by Vasiliy Tolstov 07 Nov '14

07 Nov '14

Hello. I can't see in php api reference info about setting port status of interface. virsh have comands virsh domif-setlink, but php api does not have link funstions. Please add this interface, bacause it very useful - then we need to disable some vps, but not want to shutdown it. Thanks! -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru jabber: vase(a)selfip.ru

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[libvirt-users] backup KVM qcow2 over btrfs or zfs
by Francesco Morosinotto 07 Nov '14

07 Nov '14

Hi everybody, I'm trying to implement in the non profit organization where I work a backup strategy for our VMs. At the moment I weekly backup the machine (on sunday nights) by stopping the vm, making a snapshot, exporting the xml descriptor file and syncing these files to a remote backup server. I would really like to make daily snapshot without shutting down the vms. at the moment the vms qcow2 disks are stored over an ext4 partition but I'm planning to move them over a das with a new generation filesystem. I'm trying out zfs and btrfs looking for the best one (at the moment zfs seems to be more stable and somehow easy, flexible, while btrfs seems to have better performance on my linux box). I'm choosing one of these two FS in order to use theire instant-snapshot feature; my project will be to pause the vm, dump the memory and the xml descriptor file, make a snapshot of the subvolume storing the qcow2 file and the resuming the machine back (in I hope less than 10 seconds of downtime). what do you guys suggest me? Am I going to experience bad performance having qcow2 over btrfs? I was reading something like that but the posts were really backdated... any hints is really appreciated Thank you Francesco

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[libvirt-users] Any recommendation about benchmarking tools on Linux virtual machine?
by Allen Qiu 06 Nov '14

06 Nov '14

Hi all, Do you have any recommendation about benchmarking tools on Linux virtual machine for measure the potential performance hit by virtualization, especially on multi-threads computation, since I doubt if the CentOS VM can fully make use of the 32 vCPUs (out of 64 physical cores) that I allocated to it. Regards, Allen 2014-11-05 Allen Qiu

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[libvirt-users] setvcpus libvirt 1.2.9
by Thomas Stein 05 Nov '14

05 Nov '14

Hello. I'm struggeling a little bit with the setvcpus command. I'm trying now to get this running for a linux VM. Here is what i have: <vcpu placement='auto' current='2'>4</vcpu> Now the VM is starting with 2 CPUs. When i try to increase the number of CPUs i get: setvcpus dev --guest 4 error: invalid argument: requested vcpu count is greater than the count of enabled vcpus in the domain: 4 > 2 Strange thing is when i set in the xml file: <vcpu placement='auto' current='4'>4</vcpu> the VM starts with 4CPUs and setting the CPUs works. I can do: setvcpus dev --guest 2 and: setvcpus dev --guest 4 Is this a bug? Should i try to upgrade to 1.2.10? There seem to be a lot of changes in it regarding setvcpus. thanks and cheers t.

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