October 2014 - Users - libvirt List Archives

[libvirt-users] some problem with snapshot by libvirt
by xingxing gao 21 Nov '14

21 Nov '14

Hi,all,i am using libvirt to manage my vm,in these days i am testing the libvirt snapshot ,but meet some problem: the snapshot was created from this command: snapshot-create-as win7 --disk-only --diskspec vda,snapshot=external --diskspec hda,snapshot=no but when i tried to revert from the snapshot which created from the above command ,i got error below: virsh # snapshot-revert win7 1338041515 --force error: unsupported configuration: revert to external disk snapshot not supported yet version: virsh # version Compiled against library: libvir 0.9.4 Using library: libvir 0.9.4 Using API: QEMU 0.9.4 Running hypervisor: QEMU 1.0.93

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Re: [libvirt-users] virsh net-start default fails
by Michal Privoznik 20 Nov '14

20 Nov '14

On 22.10.2014 00:03, David Roundy wrote: > Hi Michal, > > I am attaching debug logs. > > David Well, I can see the error message there, but not the reason. Does the /etc/libvirt/qemu/networks/default.xml file exist? Michal

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[libvirt-users] Changing 'source file' on running VM.
by mathew.moon＠vipaar.com 18 Nov '14

18 Nov '14

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[libvirt-users] The USB passthrough that refuses to die
by Mauricio Tavares 03 Nov '14

03 Nov '14

In trying to find out why my usb passthrough is not working, I decided to edit (virsh edit) the config file for the vm client, removing the following lines <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x051d'/> <product id='0x0002'/> </source> </hostdev> checking with "virsh dumpxml" that the lines went away, and then restarting [root@vmhost ~]# virsh start nagios error: Failed to start domain nagios error: internal error Did not find USB device 51d:2 bus:2 device:3 [root@vmhost ~]# As you can see, it is still acting like the usb device is defined. What am I missing here?

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[libvirt-users] KVM incremental backup using CBT
by Jd 03 Nov '14

03 Nov '14

Hi Looking in to implementing (CBT like) delta backup for KVM. The following looks promising..(last paragraph) http://wiki.qemu.org/Features/Snapshots2 * In the last para, there is a mention of copy the blocks from the disk using dirty-bitmap as reference. How to accomplish this ? block-mirror with bitmap or is there a qemu-img command ? some details would be appreciated. // backup software now reads foo.img using t0_dirty.dbmp to perform incremental backup, when finished * The backup after few runs in the backup store would be base image + bunch of delta blocks ? Will this be same as base disk and bunch of deltas ? or there is some special way to merge these ? * I am assuming this scheme (snapshot, bitmap, block merge etc.) should work with base disk in raw (non-qcow) format as well ? Right ? i.e. will it work when the storage disk is iscsi, lvm, fc ? std linux block device? * Are there libvirt-api/verbs for doing some of this or we will have to sue the qemu-monitor-command ? * What version of qemu/kvm will have the core capabilities and which min libvirt version would be sufficient ? Is there a better way to do incremental backup / CBT like backup than one mentioned here ? Thanks /Jd

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[libvirt-users] reboot problem with libxl
by Alvin Starr 01 Nov '14

01 Nov '14

If I reboot a single vm through libvirt/libxl the system reboots normally. If I have several vm's reboot at the same time then The systems go into a paused state and do not reboot. I then have to kill them via xl and restart them. -- Alvin Starr || voice: (905)513-7688 Netvel Inc. || Cell: (416)806-0133 alvin(a)netvel.net ||

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[libvirt-users] VNC display size
by Aaron Bruelisauer 31 Oct '14

31 Oct '14

Hi I would like to set the resolution of the video device of my domain. So if I connect with via vnc I see more. That is the part of the .xml file: "... <graphics type='vnc' port='-1' autoport='yes'/> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> ..." How can I change it? Salutations Aaron

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[libvirt-users] problem with libvirt and ovs
by Anna Giannakou 31 Oct '14

31 Oct '14

Hello, I have defined an ovs network with libvirt (virsh net-define ovs.xml) and created a vm that will connect to that network with virt-install. Although the vm port appears normally if i do an ovs-vsctl show, when i try to set this port as a mirror port for all the traffic in the bridge, the command is executed normaly, but then i cannot see any traffic on the interface. Could you give me some hints for that? The ovs.xml: <network> <name>ovs-network</name> <forward mode='bridge'/> <bridge name='br-tun'/> <virtualport type='openvswitch'/> </network> the virt-install command: virt-install --connect qemu:///system --name snort3 --ram 2048 --disk path=/tmp/snort.qcow2,device=disk,format=qcow2 --graphics vnc --vcpus 2 --hvm --network network=ovs-network --import the ovs command for mirroring ovs-vsctl -- set interface vnet0 type=internal -- --id=@p get port vnet0 -- --id=@m create mirror name=m0 select-all=true output-port=@p -- set bridge br-tun mirrors=@m if i execute the same command with another interface then i see the traffic normally. Thank you Anna

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[libvirt-users] Revert to internal snapshot - XML error: Non-empty feature list specified without CPU model
by Kashyap Chamarthy 30 Oct '14

30 Oct '14

Versions: $ rpm -q libvirt-daemon-kvm qemu-system-x86 libvirt-daemon-kvm-1.2.9-3.fc21.x86_64 qemu-system-x86-2.1.2-4.fc21.x86_64 When I attempt to revert to an internal snapshot: $ virsh snapshot-list node1 Name Creation Time State ------------------------------------------------------------ snap1 2014-06-03 14:07:28 -0400 running $ virsh snapshot-revert node1 snap1 error: XML error: Non-empty feature list specified without CPU model Contextual guest XML: $ virsh dumpxml node1 | grep features -A3 <features> <acpi/> <apic/> <pae/> </features> <cpu mode='host-passthrough'> </cpu> <clock offset='utc'> I see it's thrown from here, src/conf/cpu_conf.c, from function: virCPUDefParseXML:371 [. . .] 367 if (n > 0) { 368 if (!def->model && def->mode != VIR_CPU_MODE_HOST_MODEL) { 369 virReportError(VIR_ERR_XML_ERROR, "%s", 370 _("Non-empty feature list specified without " 371 "CPU model")); 372 goto error; 373 } [. . .] I can manually revert this snapshot via `qemu-img`, but wondering if this error from libvirt expected in this case? -- /kashyap

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[libvirt-users] libvirt with VirtualBox - possible to specify path to snapshot folder in domain.xml?
by fdytr ytruy 30 Oct '14

30 Oct '14

Hi! I'm using libvirt withVirtual Box. I have installed libvirt 0.10.2 and Virtual Box 4.1.Is possible to spesify the pat to the folder I want my differencing image created in in my domain.xml file? When I define my vm (virsh domain.xml) with my domain.xml and use the readonly tag, Virual Box creates a differencing image (default in users Vitual Box VMs folder). I want to specify in my domain.xml file what folder this differencing image should be created in (not the default folder). Is this possible? LL

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