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[libvirt-users] Blockcommit error
by Mathew Moon 22 May '15

22 May '15

HI, I am receiving the following error when I try to run blockcommit: ============================================================== root@farnsworth:/var/lib/libvirt/images# virsh blockcommit pg94-test vda --top /var/lib/libvirt/images/pg94-test.snap4 --active --pivot --verbose error: unsupported flags (0x4) in function qemuDomainBlockCommit ============================================================== I get the same error if I try only --top and --verbose flags. I am running Ubuntu Server 10.04 LTS. The snapshots I am committing were created using the following command: ============================================================== virsh snapshot-create-as --domain $DOMAIN $SNAP $DESC --disk-only --diskspec vda,snapshot=external,file=/var/lib/libvirt/images/${FILENAME} --atomic || error "Could not create snapshot." 2 ============================================================== Below is my Qemu and Libvirt version info. I don't think it is actually a problem with the command. It looks like if I provide invalid flags to the command itself I get a different error. I get this error if the command is syntactically correct and tries to actually execute the blockcommit. Any ideas what could be going on here? After reading a message between Kashyap and someone else on the list that was posted a while back it looks like it may have something to do with the snapshots not having defined their file format, but I don't know how to tell if this is it for sure, or how to go back and add that information. =============================================================== root@farnsworth:/var/lib/libvirt/images# qemu-img --version qemu-img version 2.2.1, Copyright (c) 2004-2008 Fabrice Bellard root@farnsworth:/var/lib/libvirt/images# kvm --version QEMU emulator version 2.2.1, Copyright (c) 2003-2008 Fabrice Bellard root@farnsworth:/var/lib/libvirt/images# virsh -v 1.2.6 root@farnsworth:/var/lib/libvirt/images# qemu-system-x86_64 --version QEMU emulator version 2.2.1, Copyright (c) 2003-2008 Fabrice Bellard root@farnsworth:/var/lib/libvirt/images# ===============================================================

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[libvirt-users] Drivers supporting space_hard_limit
by Christian Haase 21 May '15

21 May '15

Hi, In the XML documentation I found the element space_hard_limit for filesystems [1]. Is this feature implemented for any constellation? I try to use it with lxc 1.0.6-6 and libvirt 1.2.9-9 (all from debian jessie): <domain type='lxc' id='1234'> .... <devices> <emulator>/usr/lib/libvirt/libvirt_lxc</emulator> .... <filesystem type='mount' accessmode='passthrough'> <source dir='/tmp/libvirt/mnt'/> <target dir='/mnt'/> <space_hard_limit unit='bytes'>5242880</space_hard_limit> </filesystem> .... </devices> </domain> For testing I use dd if=/dev/zero of=/mnt/foo and ^C after a few gigabytes. Is this a supported configuration? If yes, I can provide some more info to reproduce, if not, I think this should be noted in the docs ("Only used by ??? driver"). Thanks, Christian [1] http://libvirt.org/formatdomain.html#elementsFilesystems -- ifu Hamburg - material flows and software "We enable sustainable production." ifu Hamburg GmbH Max-Brauer-Allee 50 - 22765 Hamburg - Germany fon: +49 40 480009-0 - fax: +49 40 480009-22 - email: info(a)ifu.com Managing Director: Jan Hedemann - Commercial Register: Hamburg, HRB 52629 www.ifu.com - www.umberto.de - www.e-sankey.com

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[libvirt-users] qemu/kvm: "spurious APIC interrupt"
by Stefan G. Weichinger 21 May '15

21 May '15

I know, that this might be more QEMU-specific than a libvirt-topic ... but I hope that someone in here can point me to a solution as well as there are many qemu-users in here as well I assume. - I run an ancient linux-VM with a 2.2.x kernel (I have to keep it up as the software in there is compiled against that ...) We get a lot of dmesg-lines like: spurious APIC interrupt on CPU#0, should never happen I think that this slows the VM down? I tried to disable APIC in the VMs config and in the VM (kernel-option) etc but without success so far. I also tried various clock-settings ... might setting another <type> in the vm.xml help? I have: <os> <type arch='x86_64' machine='pc-1.1'>hvm</type> the original installation was on a Pentium 2 or 3, if I remember correctly. fyi: the host is a Gentoo Linux machine, libvirt 1.2.15, qemu 2.2.1-r2 (=current). Any pointers? google didn't help much here. Thanks, Stefan

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[libvirt-users] xl extra parameters equivalent for libvirt
by Emma Anderson 21 May '15

21 May '15

hi, I use xl toolstack to manage vms on a Xen machine, and also pass some custom parameters when creating a vm, for example: xl create vm.cfg ' param="xyz" ' I am moving to libvirt for vm management. How I can pass those extra parameters using libvirt? Thanks.

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[libvirt-users] Pivot without copy
by Mathew Moon 20 May '15

20 May '15

Hi, Is it possible to "pivot" to a new image without doing blockcopy or blockpull? I know how to use snapshots and blockpull to create a new image and pivot to using it live, but what I would like to do is to have a VM switch from using imageA.qcow2 to image2.qcow2 while running. I don't see why this wouldn't be possible since some of the existing libvirt tools can do this when they are done. I would love to see an example from a bash terminal as well as how it would be done using the python API. Regards, Mathew

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[libvirt-users] Hardware requirements for SPICEd desktops
by Lucio Crusca 20 May '15

20 May '15

Hello, I posted the following to the kvm list yesterday, but now I suspect this is a more appropriate place to ask... I'm considering to build a new server and to use SPICE protocol to deploy all the Windows guests to the local network. It's my understanding that: 1. I should create the guests on the server 2. I should use remote-viewer on a minimal desktop linux on the clients over SPICE protocol 3. I should enable QXL on the server 4. I can get clients USB ports and soundcards working in the guests Now, assuming I've understood the above correctly, I haven't understood what are the hardware requirements server and client side: 1. Let's say I assign 4GB of RAM to each guest and that the network has 20 running guests at any given time, should the server have at least 80GB (20 by 4) of RAM or can I "oversell" a bit and bet on the fact that only few guests will actually use 4GB? 2. What's a reasonable amount of RAM to have installed client-side, for 4GB-RAM guests? 3. Should the clients have a CPU that supports VT-x? 4. Is it possible to have QXL supported on the clients regardless of the physical video adapter installed? 5. And what about the soundcard support? Will any linux-supported soundcard do on the clients?

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[libvirt-users] Live Migration failure: An error occurred, but the cause is unknown
by RockCui＠zhaoxin.com 14 May '15

14 May '15

Hi everyone, I’m testing the new Openstack Kilo on Ubuntu-15.04 and hypervisor is KVM. I can creat instance successfully , but live migration is always failed. Error report like this (from nova-compute.log on a compute node): 2015-05-12 18:11:12.753 3641 INFO nova.virt.libvirt.driver [-] [instance: cee4965c-b298-4b5b-8669-bee9ac72c720] Migration running for 0 secs, memory 0% remaining; (bytes processed=0, remaining=0, total=0) 2015-05-12 18:11:16.342 3641 ERROR nova.virt.libvirt.driver [-] [instance: cee4965c-b298-4b5b-8669-bee9ac72c720] Live Migration failure: An error occurred, but the cause is unknown 2015-05-12 18:11:16.777 3641 ERROR nova.virt.libvirt.driver [-] [instance: cee4965c-b298-4b5b-8669-bee9ac72c720] Migration operation has aborted If someone has a clue what may cause this, pls help. Thanks. Rock Cui 本邮件仅针对指定的收件人发送并可能含有保密或专有内容。任何非指定收件人所为之查阅、转发或使用本信息是不被允许的。如果您误收到本邮件，请立即告知发件人并删除本邮件及所有附件。谢谢！ The information transmitted in this e-mail is intended only for the addressee and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of this information by persons or entities other than the intended recipient is prohibited. If you received this e-mail in error, please notify the sender immediately, and delete this e-mail and any attachments. Thank you.

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[libvirt-users] libvirtError: this function is not supported by the connection driver: virDomainSnapshotNum
by big strong 13 May '15

13 May '15

I tried to create && open a snapshot of xen and the error appears. Is there anyway to support xen snapshotting with libxl/libvirt? This blog http://searchservervirtualization.techtarget.com/tip/Creating-snapshots-in-… offers two way to backup xen vm with linux commands, can we integrate it into libvirt?

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[libvirt-users] Qemu crash detection clarification
by Vasileios Anagnostopoulos 11 May '15

11 May '15

Hi, I am interested in the API of libvirt to detect the evnt that a domain has crashed. I am using QEMU hypervisor. I saw through a commit https://bugzilla.redhat.com/show_bug.cgi?id=636164 that a panic device has been added. However in the TODO list http://wiki.libvirt.org/page/Todo#Hypervisor_driver I found out that crash detection is not supported. What is the status of QEMU crash detection through the libvirt API? thanks -- Dr. Vasileios Anagnostopoulos (MSc,PhD) Researcher/Developer ICCS/NTUA 9 Heroon Polytechneiou Str., Zografou 15773 Athens,Greece T (+30) 2107723404 M (+30) 6936935388 E vanag(a)mail.ntua.gr<mailto:vanag@mail.ntua.gr> www.ntua.gr< http://www.ntua.gr/>

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[libvirt-users] Editing http://libvirt.org/sources/virshcmdref/html-single/#sect-attach-device
by Mauricio Tavares 11 May '15

11 May '15

I just noticed the entries on attach-disk and attach-devices are a bit on the empty size. As I am just attaching a usb device to one of my vm clients, I was wondering if I could offer examples to those entries.

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