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[libvirt-users] Host and VM performance using libvirt
by Ananth 09 Jan '12

09 Jan '12

Hi, Is there any libvirt API for measuring the Host and VM performance parameters. Or is there any virsh command implementing the same for KVM? eg: CPU utilization, memory utilization, load percentage, CPU Mhz etc., -- Regards Ananth

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[libvirt-users] libvirt-bin always hung
by mao weijie 09 Jan '12

09 Jan '12

I have installed libvirt-bin in my ubuntu 11.10 libvirt-bin version is 0.9.2.-4 ubuntu15.1 But running after a time, it is always hung. It is not response if I use "virt" . And openstack using libvirt too, it also does not work. 非淡泊無以明志，非寧靜無以致遠

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[libvirt-users] hooks not working on Ubuntu
by Zoltan Lippai 09 Jan '12

09 Jan '12

Hi everybody! I was trying to set up port forwarding to one of my VM's but I'm stuck. I was following this guide: http://wiki.libvirt.org/page/Networking#Forwarding_Incoming_Connections So I've created the hook script but it seems like libvirt is not calling it upon the start of the VM. I've put this into the hook script: date >> /tmp/libvirt-hook-debug but the file was never created. Also I put this in the script: echo "Could not find required XYZZY" >&2 exit 1 (just to make sure) This should show up in the libvirt log, but it's not there. I think it is safe to say, that this script is never called. I am using Ubuntu 11.10 and I know about the apparmor.d bug (https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/891472) so I tried to change the apparmor profile as suggested, I even tried to turn apparmor off temporarily (service apparmor teardown) but still no luck. I have libvirt 0.9.2-4ubuntu15.1 (they say the bug is fixed in 0.9.7 but it's not yet available in the repo and I'm not even sure, that my problem is related to that bug). So do you have any idea what could be going on in here? Thanks, Zoltan Lippai

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[libvirt-users] Libvirtd slowness
by Nathan March 06 Jan '12

06 Jan '12

Hi, Can anyone tell me if it's normal to take over 2 seconds to connect to the libvirt daemon? xen1 ~ # time virsh -c 'xen://xen5/' pwd real 0m2.102s xen1 ~ # time virsh -c 'xen://xen1/' pwd real 0m2.217s Strace shows it sitting for 2.08s on polling the remote socket: poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=6, revents=POLLIN}]) <2.082839> Not quite sure why though? Experiencing this on both 0.9.7 and 0.9.0. This happens both with virsh and the perl libvirt bindings. If i just spawn virsh interactively I only incur that 2s hit on intial spawn, all commands are very quick and responsive. Anyone have any suggestions? - Nathan -- Nathan March<nathan(a)gt.net> Gossamer Threads Inc. http://www.gossamer-threads.com/ Tel: (604) 687-5804 Fax: (604) 687-5806

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[libvirt-users] Python bindings for libvirt
by Ananth 06 Jan '12

06 Jan '12

Hi, I referred to the developer guide in libvirt.org regarding python bindings. But the document says TBD and it was last updated in 2010. Could you point to any sources regarding python bindings to call libvirt APIs? -- Regards Ananth

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[libvirt-users] Issue with event registration
by Tyrion Lannister 05 Jan '12

05 Jan '12

Hi, I could find only one post related to this, but that did not address my problem. I am trying to register for VM events using virConnectDomainEventRegisterAny, but that is returning with the error "libvir: Remote error : this function is not supported by the connection driver: no event support" I have registered for the default event implementation (as suggested in the response to an earlier post related to this problem) prior to calling *RegisterAny, but that is not helping. Browsing through the coe, it seems to me this has to do with the timer support in the domainEventState, just a guess. if (priv->domainEventState->timer < 0) { remoteError(VIR_ERR_NO_SUPPORT, "%s", _("no event support")); goto done; } I am using Centos 6 with KVM QEMU. Thanks, Suresh

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[libvirt-users] libvirt-java: generate Java code from rng schema
by Celsina Bignoli 05 Jan '12

05 Jan '12

Hi, I am a quite new to libvirt, and need to use it from within Java code. I was wondering if anyone has been able to generate Java classes from the publisher rng schema. I also wonder why rng format was used over more common formats, which would make things easier since there are a number of code generators for it which are well established, at least in the Java world... Any suggestion would be greatly appreciated. Thank you, elsa

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[libvirt-users] Feasibility of iscsi storage pool
by Dennis Jacobfeuerborn 05 Jan '12

05 Jan '12

Hi, I want to start using iscsi storage but ran into a problem. I defined a storage pool and this contains my first LUN which is mounted on a hypervisor. When I now add a second LUN on a target and do a tgt-admin --update --force to reload the target the i/o to the first LUN seems to freeze for a few seconds. Now I'm wondering if I'm doing anything wrong? It's not really tolerable to have all guests using this target freeze simply because I want to add another LUN. The alternative is to use one LUN per target and define lots of targets on the server but then the whole pool configuration no longer makes sense as I would essentially end up with one pool per guest volume. Does anyone have experience with this kind of setup? Regards, Dennis

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[libvirt-users] [LIBVIRT] Xen issue.
by Armand Leclercq 04 Jan '12

04 Jan '12

Hi everybody, I'ld to use virsh over ssh in order to connect to my xen hypervisor from one of my DomU. I tried: virsh -c xen+ssh://root@192.168.0.67:22 list --all And it correctly listed the started virtual computers. And when I tried virsh connect xen+ssh://root@192.168.0.67:22 And I got. error: no connection driver available for xen:/// error: failed to connect to the hypervisor Does that mean I wrongly configured my computers or that libvirt does not support such connection from a DomU. -- Armand Leclercq EPITA 2013 06 71 57 90 73 armand.leclercq(a)gmail.com. /Computer Science is embarrassed by the computer./ _Alan Perlis_

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[libvirt-users] Hotplug/hotadd functionality of libvirt?
by Kees van Reeuwijk 03 Jan '12

03 Jan '12

Hello, First of all, happy new year! I am interested in the hot plugging facilities of libvirt, in particular in what qemu calls 'hot add' of network interface cards. (And also the reverse: hot unplugging/removing of NICs.) I think I am overlooking something, but so far the best I have been able to find is: http://libvirt.org/sources/virshcmdref/html/ and it is not entirely clear to me what the relevant virsh commands are. The most obvious choice seems to be the iface-* commands such as http://libvirt.org/sources/virshcmdref/html/sect-iface-define.html but these seem to be about physical rather than virtual network interfaces, and the documentation `needs to be written' anyway, and from the copyright notice the manual seems to be somewhat outdated by now. Can you give me a little help with this? Is such hot plug/add functionality supported by libvirt in the first place? Is there some kind of overview document about this? What is the most authoritative documentation of this functionality? Is there a Java or C API to access this functionality? Thank you for any help you can give me, -- Kees van Reeuwijk

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