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[libvirt-users] KVM raw on DRDB on LVM logical volume?
by Whit Blauvelt 25 Oct '12

25 Oct '12

Hi, I'm trying to get KVM VMs set up right on top of DRBD, with a dedicated DRBD mirror instance on top of a dedicated pair of LVM LVs per VM - allowing, for instance, primary-secondary DRBD assignments at the same granularity as the VMs. In other words, I want to put VMs in raw format directly to the DRBD block device, just as they are commonly put to an LV block device, with the DRBD block device stacked on the LV block device. DRBD is happy to stack on an LV (just as libvirt-KVM-QEMU is happy to). But when I take an existing KVM LV, set up DRBD for it (DRBD can typically be placed on a partition with an existing file system, which it inherits), and then use "virsh edit" to replace the source dev, like so: <disk type='block' device='disk'> <driver name='qemu' type='raw'/> <source dev='/dev/VolumeGroup/SomeVolume'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> changing the center line to <source dev='/dev/drbd/by-res/SomeDom'/> (or /dev/drbdN - to which that's a symlink), then I get # virsh start sql error: Failed to start domain SomeDom error: unable to open disk path /dev/drbd/by-res/SomeDom: Wrong medium type If this were a normal file system, setting up DRBD with it, then remounting it through the DRBD device would work. But libvirt doesn't want to "mount" it. This is with virsh 0.9.12. I don't know what constitutes "Wrong medium type" here. I had thought it the general case that raw files for KVM can be written to block devices generally, which is what a DRBD device is, just as much as an LV device is. Is this then a case where I have to change something else in the XML? Or a case where it would work except that libvirt doesn't recognize that this is a media type that will work, yet is is, so that the answer would be to alter libvirt's source and recompile? Or would getting this scheme to work require the trouble of stacking things like VM LV VG PV DRBD LV VG PV DISK instead of simply like VM DRBD LV VG PV DISK Since there's a strict 1 VM-1 DRBD-1 LV correspondence, I'm hoping those extra layers won't be necessary to get DRBD into the stack. Thanks, Whit

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[libvirt-users] Please help: Libvirt event for disk change is not being registered by DomainEventRegisterAny()
by Abhishek Srivastava 25 Oct '12

25 Oct '12

Hi, I am writing an application which would monitor the changes on the domain on the KVM hypervisor through libvirt events. Recently I have upgraded my libvirt from 9.4 to 9.10 and I have this issue. While *de-registering* for DomainEventDiskChangeCallback, I get a libvirt error saying 'libvirtError: internal error domain event 2 not registered;' where 2 is the callbackid returned by virConnectDomainEventRegisterAny() for the disk change event type. This error didn’t occur when I used libvirt 0.9.4-23.el6_2.6 Can you please enlighten me on the recent changes that has been made? Also, is the diskchange event a part of the domains life cycle event? Any help on this issue will be highly appreciated. Thanks and regards, Abhishek

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[libvirt-users] Disk-only internal snapshot
by Davide Guerri 25 Oct '12

25 Oct '12

Hi all, it's possible to do an internal snapshot with the --disk-only option (for qcow2 images)? The following command virsh snapshot-create-as my-dom my-snap my-description creates an internal snapshot but the following virsh snapshot-create-as my-dom my-snap my-description --disk-only creates an external snapshot. Thanks, Davide.

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[libvirt-users] cannot start domain with SR-IOV interface
by Radhika Niranjan 24 Oct '12

24 Oct '12

Hi, I've been using libvirt (versions 0.9.11.5, and recently upgraded to 0.10.2), and have been attaching an SR-IOV VF to my VM with the following device configuration: <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x07' slot='0x10' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </hostdev> I had no problems with bringing up the VM and using the VF with this configuration. Recently I noticed that I would be able to assign a mac address to the SR-IOV VF if I used the interface configuration and changed over to using: <interface type='hostdev'> <mac address='52:54:00:d3:23:4f'/> <source> <address type='pci' domain='0x0000' bus='0x07' slot='0x10' function='0x0'/> </source> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> My VM fails to start up with this interface configuration. The error reported is: error: Failed to start domain exp85-1 error: An error occurred, but the cause is unknown When I look into /var/log/messages I see the following messages: Oct 15 15:25:48 dcswitch85 libvirtd[17709]: 2012-10-15 22:25:48.145+0000: 17713: error : virFileReadAll:457 : Failed to open file '/var/run/libvirt/qemu/p1p1_vf0': No such file or directory Oct 15 15:25:48 dcswitch85 libvirtd[17709]: 2012-10-15 22:25:48.146+0000: 17713: error : qemuRemoveCgroup:740 : internal error Unable to find cgroup for exp85-1 Oct 15 15:25:48 dcswitch85 libvirtd[17709]: 2012-10-15 22:25:48.146+0000: 17713: warning : qemuProcessStop:4136 : Failed to remove cgroup for exp85-1 I was wondering if anyone else has faced this problem or has a solution to this. I'm using Fedora17, KVM, and an 82599EB Intel NIC. Thanks much in advance. With best regards Radhika

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[libvirt-users] Failed to query file context on : No data available
by #█er 24 Oct '12

24 Oct '12

Hi:I downloaded a cirros-0.3.0-x86_64-rootfs.img and mount it to /tmp/bak then I edit a xml file ,here is the content: <domain type='lxc'> <name>vm1</name> <memory>500000</memory> <os> <type>exe</type> <init>/bin/sh</init> </os> <vcpu>1</vcpu> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount'> <source dir='/tmp/bak'/> <target dir='/'/> </filesystem> <interface type='network'> <source network='default'/> </interface> <console type='pty' /> </devices> </domain> I defined it and no error , but when I start it , it comes with error: Failed to start domain vm1 error: internal error guest failed to start: 2012-10-24 13:08:14.684+0000: 16935: info : libvirt version: 0.9.10, package: 21.el6_3.4 (CentOS BuildSystem <http://bugs.centos.org>, 2012-08-23-18:28:26, c6b9.bsys.dev.centos.org) 2012-10-24 13:08:14.684+0000: 16935: error : lxcControllerRun:1484 : Failed to query file context on /tmp/bak: No data available here is the ls -al /tmp/bak total 92 drwxr-xr-x 21 root root 4096 Oct 24 20:43 . drwxrwxrwt. 5 root root 4096 Oct 24 21:08 .. drwxr-xr-x 2 root root 4096 Oct 24 20:43 bin drwxr-xr-x 3 root root 4096 Oct 24 20:43 boot drwxr-xr-x 3 root root 4096 Oct 24 20:43 dev drwxr-xr-x 7 root root 4096 Oct 24 20:43 etc drwxr-xr-x 4 root root 4096 Oct 24 20:43 home -rwxr-xr-x 1 root root 2785 Oct 24 20:43 init lrwxrwxrwx 1 root root 32 Oct 24 20:43 initrd.img -> boot/initrd.img-3.0.0-12-virtual drwxr-xr-x 4 root root 4096 Oct 24 20:43 lib lrwxrwxrwx 1 root root 11 Oct 24 20:43 linuxrc -> bin/busybox drwx------ 2 root root 4096 Oct 24 20:43 lost+found drwxr-xr-x 2 root root 4096 Oct 24 20:43 mnt drwxr-xr-x 2 root root 4096 Oct 24 20:43 .oldroot drwxr-xr-x 2 root root 4096 Oct 24 20:43 old-root drwxr-xr-x 2 root root 4096 Oct 24 20:43 opt drwxr-xr-x 2 root root 4096 Oct 24 20:43 proc drwx------ 2 root root 4096 Oct 24 20:43 root drwxr-xr-x 2 root root 4096 Oct 24 20:43 run drwxr-xr-x 2 root root 4096 Oct 24 20:43 sbin drwxr-xr-x 2 root root 4096 Oct 24 20:43 sys drwxr-xr-t 3 root root 4096 Oct 24 20:43 tmp drwxr-xr-x 6 root root 4096 Oct 24 20:43 usr drwxr-xr-x 8 root root 4096 Oct 24 20:43 var lrwxrwxrwx 1 root root 29 Oct 24 20:43 vmlinuz -> boot/vmlinuz-3.0.0-12-virtual How can I solve this problem? Thanks :-)

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[libvirt-users] Libvirt event for disk change is not being registered by DomainEventRegisterAny()
by Abhishek Srivastava 24 Oct '12

24 Oct '12

Hi, I am writing an application which would monitor the changes on the domain on the KVM hypervisor through libvirt events. Recently I have upgraded my libvirt from 9.4 to 9.10 and I have this issue. While *de-registering* for DomainEventDiskChangeCallback, I get a libvirt error saying 'libvirtError: internal error domain event 2 not registered;' where 2 is the callbackid returned by virConnectDomainEventRegisterAny() for the disk change event type. This error didn’t occur when I used libvirt 0.9.4-23.el6_2.6 Can you please enlighten me on the recent changes that has been made? Also, is the diskchange event a part of the domains life cycle event? Any help on this issue will be highly appreciated. Thanks and regards, Abhishek

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[libvirt-users] Questions and a blockpull issue
by Abbas 24 Oct '12

24 Oct '12

Coming off of xen environment; still testing with kvm, just a few questions: 1. What is the roadmap for release of qemu-kvm 1.1 and libvirt 0.10.2 for el6, cause I had to compile from upstream to get the latest stuff. 2. Should not virt-manager show the sparsed disk size instead of actual reserved size of a vm? 3. Where is the virsh bash_completion conf.d file from upstream; since el6 rpm for it seems have tab completion built right into virsh shell. 4. Created a disk-only snapshot of a vm CO1 called capture1 but the syntax of blockpulling seems to be opposite from what has been advertised on Fedora and other relative wikis. Check below and the error with first blockpull command. [root@KVM libvirt]# virsh snapshot-create-as CO1 capture1 "CO1s first snapshot test" --disk-only --atomic [root@KVM libvirt]# virsh -d 0 blockpull CO1 --path /home/vms/co1.img --bandwidth 500 --base /home/vms/co1.capture1 blockpull: domain(optdata): CO1 blockpull: path(optdata): /home/vms/co1.img blockpull: bandwidth(optdata): 500 blockpull: base(optdata): /home/vms/co1.capture1 blockpull: found option <domain>: CO1 blockpull: <domain> trying as domain NAME error: invalid argument: No device found for specified path [root@KVM libvirt]# virsh -d 0 blockpull --domain CO1 --path /home/vms/co1.capture1 --base /home/vms/co1.img --verbose --wait blockpull: domain(optdata): CO1 blockpull: path(optdata): /home/vms/co1.capture1 blockpull: base(optdata): /home/vms/co1.img blockpull: verbose(bool): (none) blockpull: wait(bool): (none) blockpull: found option <domain>: CO1 blockpull: <domain> trying as domain NAME Block Pull: [100 %] Pull complete Best, Abbas.

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[libvirt-users] Unable to start guest
by Jeremy Johnston 23 Oct '12

23 Oct '12

I have been picking away at this problem and I have not been able to resolve it yet and it appears quite puzzling to me, I am attempting to start a guest on KVM and receive 'error: An error occurred, but the cause is unknown'. I have a feeling this may be something simple I am overlooking. I have included log files and the xml of the guest at http://node4.smart-serv.net/~jeremy/libvirt/

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[libvirt-users] using vbox driver hypervisor support
by p.venkatasrinivas＠tcs.com 23 Oct '12

23 Oct '12

Hi, I installed Libvirt. We need virtualbox support for libvirt. But we are unable to see the vbox option in virt-manager. How we can find vbox hypervisor driver? And also we already compiled libvirt with vbox option.(--with-vbox). But that didn't work. And also when we are creating the new virtual machine through virt-manager we are getting the following error: internal error cannot parse QEMU version number in "" Can you please suggest on this what we need to do as soon as possible? Thanks in advance. Srinivas =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

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[libvirt-users] start and stop a VMware VM using libvirt API
by Ali Nikzad 23 Oct '12

23 Oct '12

Hi, I am a new libvirt user and I wonder if I can use this library to start or stop a VM in ESXi 5.0. For example to write an application using libvirt in windows or linux that connects to an ESXi 5.0 server and get the list of VMs and start one of them. If so, is there any sample about it? Thank you, Ali

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