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[libvirt-users] Unable to close open libvirt connections
by Jatin Kumar 12 Jan '12

12 Jan '12

Hello, I was getting the following error in syslog: libvirtd: 21:19:12.116: 10955: error : qemudDispatchServer:1355 : Too many active clients (20), dropping connection from 127.0.0.1;0 I investigated a bit and tried the following in a python console: import libvirt ~~~~ conn=libvirt.openReadOnly("qemu+ssh://HOST_IP/system<http://10.16.71.1/system> ") //now check the no. of connections (by lsof|grep ESTABLISHED in the HOST), the count will increase by 1 conn.close() *//the count will decrease by 1, it returns 0* ~~~~ conn=libvirt.openReadOnly("qemu+ssh://HOST_IP/system<http://10.16.71.1/system> ") //now check the no. of connections, the count will increase by 1 dom=conn.lookupByName("sowmya") print dom.info() conn.close() *//the count will not change, it returns 1* * * This is creating a lot of trouble to me but the reason is unknown. If someone could please point me out, if i am missing something. -- Jatin

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[libvirt-users] Haskell bindings for libvirt
by Michael Litchard 12 Jan '12

12 Jan '12

I'm exploring the possibility of developing bindings for libvirt. I've never done this kind of project before. Could someone point me to the documentation of particular interest concerning this goal?

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[libvirt-users] Looking for feedback
by Zorg 11 Jan '12

11 Jan '12

Hello list! I'm currently digging into libvirt-based virtualisation infrastructure (KVM/Qemu Hypervisors so far). I have a little concern here: Let's say we have two hypervisors (I and II), running 3 VMs each - I runs a,b,c and II runs d,e,f. Virtual disks are stored on a centralized storage solution, let's say a good old cluster of NFS filers. Network configuration is homogenous on the two hypervisors -- same bridge names to the same ethernet segments. Basically, a, b and c are defined on I - the XML description is stored on I. So far, so good. Then let's say I crashes badly. The XML descriptions for a,b, and c are lost, the process of starting these VMs on II would involve re-defining it on II from a backup of XML descriptions. That's not quite an automated/fluent process, and the idea of doubling hypervisors into a HA cluster just for that matter is clearly overkill to me. Are you, by chance, aware of an OpenSource libvirt-based solution that is able to keep track of each VM xmldesc, starting lost guests as transient domains on another hypervisor upon failure of the original hypervisor ?

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[libvirt-users] Communication with Hyper-V
by Vadim Gurevich 10 Jan '12

10 Jan '12

Hi, I'm interested in using libvirt to communicate with Microsoft's Hyper-V. I'm trying to use virsh, but with no success. I have a machine that runs Windows Server Developer Preview with Hyper-V on it, ip x.x.x.x I set the service Basic and AlloUnencrypted properties on this machine to true, as required I also have a Linux machine x.x.y.y, with libvirt installed. This is what I get: virsh -c hyperv://x.x.x.x/?transport=http error: Cannot read CA certificate '/etc/pki/CA/cacert.pem': No such file or directory error: failed to connect to the hypervisor My questions are: 1. As I understand, if my hypervisor was on Linux, there's a daemon "libvirtd" that should be installed on it. Is there an equivalent service for Windows? I installed this thing on the Hyper-V machine: http://libvirt.org/sources/win32_experimental/Libvirt-0.8.8-0.exe, but am not sure about its purpose. 2. Why do I get an error about certificate, when I specified the transport to be http? Thanks, Vadim

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[libvirt-users] Host and VM performance using libvirt
by Ananth 10 Jan '12

10 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 07 Jan '12

07 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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