- Users - libvirt List Archives

[libvirt-users] Domain did not show up error
by Matt Wallace 24 Jun '10

24 Jun '10

Hi all, I've run into an issue with using libvirt via the ruby bindings. When trying to create a new domain via xml, I get the following error: libvir: QEMU error : internal error Domain webserver.staging.myco.com didn't show up When I check using virsh, the domain has been defined and shows as "running" when I execute "list --all" but does not show up when I execute "list" nor will it let me connect via "console webserver.staging.myco.com". Can anyone shed any light on why this might be? O/S: Centos 5.4 Ruby: ruby 1.8.5 (2006-08-25) [x86_64-linux] Libvirt: 0.6.3 If you need any more information, please let me know. If you want to see the code that is being used, it's cucumber-vhost (http://github.com/proffalken/cucumber-vhost) Thanks, Matt

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[libvirt-users] Obtaining UTC Time from Remote VM Host
by Development 24 Jun '10

24 Jun '10

Quick question on whether it is possible to use the libvirt API exposed by the libvirt DLL compiled on a Vista machine to obtain the system time in UTC of the remote machine hosting several VMs? Many thanks...

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[libvirt-users] Qemu backend: Cannot start new domains after some time
by Guido Winkelmann 24 Jun '10

24 Jun '10

Hi, After using libvirt+qemu for a while, I'm finding that I can no longer reliably start new domains. Most of the time when I try, I'm getting this, or something like it: virsh # start dhcpv6server error: Failed to start domain dhcpv6server error: monitor socket did not show up.: No such file or directory The same thing happens when trying to start the domain using the C-API. This happens particularly often when there are any domains running that are using a lot of CPU, even when most of the physical cores of the host machine are still sitting idle. (I've created a number of Linux VMs, with one CPU core each, that do nothing but calculate primes in an endless loop for load-testing purposes.) If I destroy all of the high-load domains, I can usually start up new domains again. The time between requesting the domain startup and the error message being printed varies greatly, from less than a second to more than a minute. The host machine is running Fedora 12 with libvirt 0.8.1 and qemu-kvm 0.12.4. Any ideas what might be causing this, and what can be done about it? It would be a big problem for us if we cannot start any new domains just because some of the existing ones are using a lot of CPU... Regards, Guido

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Re: [libvirt-users] Question about the remote Authentication in the libvirt Java bindings
by Bryan Kearney 22 Jun '10

22 Jun '10

Dustin: I am adding this response to the libvirt list as well so that others may see it. The authorization is done via a callback. The ConnectAuthDefault() that you are using is one such implementation. You could create your own subclass of ConnectAuth, and override the method: public abstract int callback(Credential[] cred); And then provide the username/password in that fashion. Look at the ConnectAuthDefault in the case statement how it chooses to ask for username and password. -- bk On 06/21/2010 10:35 PM, Dustin Xiong wrote: > Dear Bryan Kearney： > > I hava a question about the remote authentication of the libvirt java > bindings. I run the test.java of the libvirt-java-0.4.3.tar.gz. I can > connect the remote host use the > > ConnectAuth defaultAuth = new ConnectAuthDefault(); > try{ conn = new Connect("xen+ssh://192.168.0.146/", defaultAuth, 0); > > Then I input the remote host's ssh password, I can connect the host. > If I don't want to input the ssh password, I want write the password > into the libvirt or libvirt-java' src code. > How can modify the libvirt or libvirt-java src code, the libvirt will > auto connect to the remote host without user input the ssh code. > > Thanks for help. > > -Dustin

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[libvirt-users] How to get supported feature list in driver
by Ryota Ozaki 21 Jun '10

21 Jun '10

Hello Is there an easy way to get supported feature (API) list in each driver? The function would be to return a list which describes which APIs are supported and which APIs are not. Thanks in advance ozaki-r

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[libvirt-users] libvirtError: poll on socket failed: Interrupted system call
by jeremy avnet 19 Jun '10

19 Jun '10

Hello. I just upgraded from libvirt 0.7.0 to 0.7.5 in Ubuntu Lucid and now my application will get into a hung state. I have to kill it at which point I get the following error from the Python bindings: Traceback (most recent call last): File "/usr/local/app/vm.py", line 246, in launch vm.create() File "/usr/lib/python2.6/dist-packages/libvirt.py", line 300, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: poll on socket failed: Interrupted system call Some searches turned up a patch involving signals sent by ncurses apps resizing, but this is not an ncurses app. It's a daemonized Python Twisted application. Unfortunately, this problem is making it so the application hangs indefinitely until we kill it and start it again. Any suggestions as to what might be causing this? Thanks! .:. jeremy

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[libvirt-users] java.lang.UnsatisfiedLinkError: jnidispatch (/com/sun/jna/linux-i386/libjnidispatch.so) not found in resource path
by Rafael Braga 18 Jun '10

18 Jun '10

Hi everybody, I'm trying to run the sample of the site, but is not working. In fact, already includes jna.jar in my class path, see. What can it be? -- Rafael Braga

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[libvirt-users] Snapshots - can't take a snapshot with running VM
by Julian Robbins 17 Jun '10

17 Jun '10

Hi I'm quite new to KVM/libvirt0 so hope you can help I'm using Ubuntu Lucid 10.04 and libvirt0 0.8.1 When I try a :- snapshot create vm_name I get an error, ie 'error -5 while writing' Googling doesnt bring anything up. Taking snapshots of a vm when it isnt running works fine. Can I really only create snapshots of a vm when it isnt running ? -- Kind regards Julian

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[libvirt-users] cannot acquire state change lock
by Julian Robbins 17 Jun '10

17 Jun '10

Hi I keep getting libvirtError: Timed out during operation: cannot acquire state change lock errors - what does this mean exactly ? Using Ubuntu 64 bit 10.04 host and guest -- Kind regards Julian Robbins

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[libvirt-users] libvirt API hangs
by Zhang Qian 17 Jun '10

17 Jun '10

Hi, I have someVMs in my KVM hosts(RHEL 5.5), I found when run "virsh save <domain> <file>" to save a VM, the command "virsh dominfo <domain>" will hang until the save command finishes. Is this libvirt's behavior? Or KVM/QEMU's? This may impact the performance. Thanks, Qian

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