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[libvirt-users] Trouble creating virtio-serial device
by David Richardson 15 Nov '14

15 Nov '14

Hello, I've running Ubuntu-14.04 as my host and my guest. I've been trying to get guest to host communication set up by configuring a virtio-serial device. My xml file contains: <channel type='unix'> <source mode='bind' path='/home/dave/vm1.agent'/> <target type='virtio' name='vm1'/> </channel> When I start up the VM, I get the following error: error: Failed to create domain from vm1.xml error: internal error: process exited while connecting to monitor: qemu-system-x86_64: -chardev socket,id=charchannel0,path=/home/dave/vm1.agent,server,nowait: Failed to bind socket: Permission denied qemu-system-x86_64: -chardev socket,id=charchannel0,path=/home/dave/vm1.agent,server,nowait: chardev: opening backend "socket" failed dmesg shows what appears to be an apparmor denial for mknod: [250108.632450] type=1400 audit(1415994657.679:152): apparmor="DENIED" operation="mknod" profile="libvirt-2fd2ec54-f644-228e-08ba-297c8b304153" name="/home/dave/vm1.agent" pid=21856 comm="qemu-system-x86" requested_mask="c" denied_mask="c" fsuid=112 ouid=112 I can add a line to /etc/apparmor.d/abstractions/libvirt-qemu similar to: owner /home/dave/vm1.agent rw, After restarting apparmor, this gets rid of the apparmor complaint, but I still get the same error from 'virsh create vm1.xml' when trying to create the VM. Any suggestions for how to fix this? Thanks, ~Dave

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[libvirt-users] hostdev a Xeon Phi
by lejeczek 14 Nov '14

14 Nov '14

hi everybody I'd like to ask around if Xeon Phis are any good for passthrough? Are there any plans for near future or maybe there are already some success stories using this product? many thanks, P.

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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 12 Nov '14

12 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 08 Nov '14

08 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 07 Nov '14

07 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 06 Nov '14

06 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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[libvirt-users] setvcpus --guest on windows
by Thomas Stein 05 Nov '14

05 Nov '14

Hello. Just a quick question. Is "setvcpus $windowsVM --guest 4" supposed to work? I have qemu-guest-agent (1.6.something) running inside a windows7 vm but all i get is: virsh # setvcpus windows7 --guest 4 error: invalid argument: requested vcpu count is greater than the count of enabled vcpus in the domain: 4 > 1 The xml file looks like this: <vcpu placement='static' current='1'>4</vcpu> cheers t.

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[libvirt-users] old vm cannot be migrated, new vm can be migrated
by gustavo panizzo (gfa) 05 Nov '14

05 Nov '14

scenario: i run a mix of libvirt 1.1.1 and 1.2.2 on the source hosts, 1.2.2 on the destination hosts qemu: 1.5.0+dfsg-3ubuntu5.3~cloud0 on all the hosts openstack havana and icehouse description: i have many compute nodes running libvirt+kvm, when i try to migrate guest that were created months ago it fails, if i create a vm and then migrate it works the problem is that libvirt cannot retrieve the mtu of the bridge were the interfaces are be attached, but bridge is there (up and running) $ grep qbr32740ab3-b6 /var/log/libvirt/libvirtd.log 2014-11-05 08:44:53.013+0000: 35311: debug : udevGetDeviceProperty:121 : udev reports device 'qbr32740ab3-b6' does not have property 'DRIVER' 2014-11-05 08:44:53.013+0000: 35311: debug : udevGetDeviceType:1217 : Could not determine device type for device with sysfs name 'qbr32740ab3-b6' 2014-11-05 08:44:53.013+0000: 35311: debug : udevAddOneDevice:1392 : Discarding device -1 0x7f36e80bd5c0 /sys/devices/virtual/net/qbr32740ab3-b6 2014-11-05 08:44:53.013+0000: 35311: debug : udevProcessDeviceListEntry:1414 : Failed to create node device for udev device '/sys/devices/virtual/net/qbr32740ab3-b6' 2014-11-05 08:45:08.458+0000: 35303: error : virNetClientProgramDispatchError:175 : Cannot get interface MTU on 'qbr32740ab3-b6': No such device # ip l show dev qbr32740ab3-b6 639: qbr32740ab3-b6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 72:d5:db:f6:b5:30 brd ff:ff:ff:ff:ff:ff # brctl show qbr32740ab3-b6 bridge name bridge id STP enabled interfaces qbr32740ab3-b6 8000.72d5dbf6b530 no qvb32740ab3-b6 tap32740ab3-b6 the difference between a new defined domain and an old one is this < <alias name='pci0'/> --- > <alias name='pci.0'/> > <timer name='hpet' present='no'/> ---> old domain does not have it i even tried patching src/util/virnetdev.c to remove the check and always return 1500 but the same thing happens i'm lost i don't know where to look at it, any clue were to look is appreciated -- 1AE0 322E B8F7 4717 BDEA BF1D 44BB 1BA7 9F6C 6333

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[libvirt-users] ioremap error during bootup
by Allen Qiu 05 Nov '14

05 Nov '14

Hi all, Does anybody have an idea about this "ioremap error" during the booting stage of VM CentOS7, although it can eventually bootup successfully. Regards, Allen 2014-11-05 Allen Qiu

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[libvirt-users] fstrim support in libvirt/qemu guests
by Dennis Jacobfeuerborn 04 Nov '14

04 Nov '14

Hi, I'm trying to find out how to enable fstrim support for libvirt/qemu guests. Specifically I'm trying to enable this on a CentOS 7 host (qemu 1.5). I searched the web but only found very vague information and no clear documentation on the requirements or how to modify the guest xml to enable discard/fstrim support. Can someone point me in the right direction? Regards, Dennis

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[libvirt-users] The USB passthrough that refuses to die
by Mauricio Tavares 04 Nov '14

04 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] quick question on schedinfo
by Yasser Shalabi 01 Nov '14

01 Nov '14

Hey everyone, Can anyone explain the scedinfo parameters? I am wondering if I can use this, (along with host side niceness scheduler tweaks) to cause vCPUs to dominate the total time of the CPUs they are pinned to. Here are the sched info parameters: Scheduler : posix cpu_shares : 0 vcpu_period : 0 vcpu_quota : 0 emulator_period: 0 emulator_quota : 0 The documentation ( http://libvirt.org/sources/virshcmdref/html/sect-schedinfo.html) is not yet filled for this. If anyone can explain these parameters, or point me to relevant code it would be helpful! Thanks Yasser

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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 01 Nov '14

01 Nov '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 31 Oct '14

31 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 31 Oct '14

31 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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[libvirt-users] Can't specify filename.xml when using virsh dumpxml
by Allen Qiu 30 Oct '14

30 Oct '14

Hi all, Do you have any idea about this error? virsh # dumpxml csg01win7test > domain.xml error: unexpected data '>' Regards, Allen 2014-10-28 Allen Qiu

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