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[libvirt-users] Handling connection closes in (older) Sys::Virt
by Henrik Ahlgren 14 Nov '12

14 Nov '12

I hope this is the correct mailing list for discussing the Sys::Virt Perl module. It appears that the most recent version has a new method called register_close_callback that, I believe, can be used to catch errors when the connection to libvirt is closed, e.g. due to libvirt restart or a network related issue. (I've been testing this simply by killing the the SSH process in the libvirt server.) However, Debian still ships libvirt 0.9.12 in stable backports and testing, as probably do many other mainstream distributions. The latest Perl bindings that can be installed from CPAN is thus 0.9.12 and it does not have support for close callbacks. Not only that, when a Perl program loses the (ssh) connection to libvirt, Perl just crashes: Program received signal SIGPIPE, Broken pipe. 0x00007ffff73de0d0 in __write_nocancel () from /lib/libpthread.so.0 Setting a $SIG{PIPE} handler does not seem to help. Is there any possibility of a Perl program surviving and gracefully handling a closed libvirt connection with libvirt version 0.9.12 or older? Henrik

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[libvirt-users] Virt-io Kernels for older RHEL/CentOS versions
by Chandana De Silva 14 Nov '12

14 Nov '12

All, I need to run a number of guests which user older distributions of RHEL and CentOS on an RHEL 6.3 host. The versions are; 4.8 - i386 5.1 - i386 5.2 - x86_64 5.3 - i386 Currently I am running these with the E1000 network driver and the IDE driver. Where can I find kernels (or modules) for virtio for these OS's ? Thanks in advance Chandana

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[libvirt-users] virt-install kickstart local file
by Joe Linoff 13 Nov '12

13 Nov '12

Hi Everybody: I am trying to get virt-install to work with a kickstart file that is on the local file system. I tried using the --initrd-inject="/tmp" --extra-args="ks=file:/myks.cfg" but I got this error message: ERROR --extra-args only work if specified with --location. Here is the basic command: virt-install \ --accelerate \ --cdrom /tools/iso/CentOS-6.3-x86_64-bin-DVD1.iso \ --disk device=disk,path="/var/lib/libvirt/images/myguest.img" \ --graphics vnc \ --name myguest \ --os-type linux \ --os-variant rhel6 \ --ram 2048 \ --vpcus 1,maxvcpus=4 \ --initrd-inject "/tmp" \ --extra-args "ks=file:/myks.cfg" Why do I need the location? I thought that was only used when installatiing from a distribution tree. I am using a DVD ISO image. If I have to use it, how would I specify it? If this approach won't work, I could move the ks.cfg file to an NFS mounted file system but I am not sure what the syntax is for that. I am running this on a CentOS 6.3 system. libvirt: 0.9.10 qemu: 0.12.1 Thank you, Joe

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[libvirt-users] virt-viewer X forwarding through ssh broken since FC17 upgrade?
by Ken Coar 13 Nov '12

13 Nov '12

Ever since I upgraded my laptop from FC15 to FC17, I've been getting this message when I ssh to some RHEL6 hosts inside Red Hat. In particular, I'm trying to do this: virt-viewer --connect \ qemu+ssh://kvm11.devlab.phx1.redhat.com/system \ bork-s01.candlepin.dev.devlab.phx1.redhat.com This is the message I get: X11 forwarding request failed on channel 0 A viewer window pops up for a fraction of a second and then goes away. Using -vvvv on the local ssh command gives a few possibly related messages: debug2: x11_get_proto: /usr/bin/xauth list :0.0 2>/dev/null debug1: Requesting X11 forwarding with authentication spoofing. debug2: channel 0: request x11-req confirm 1 debug1: Requesting authentication agent forwarding. debug2: channel 0: request auth-agent-req(a)openssh.com confirm 0 : debug1: Remote: No xauth program; cannot forward with spoofing. This is new, and, not being an X maven, largely opaque to me. xauth is provided by package xorg-x11-xauth, which is typically *not* installed. Installing it on the system to which I'm trying to ssh gets rid of the message, but doesn't change the up-down behaviour of the viewer window. Temporarily moving my local /usr/bin/xauth leads to this message in addition: Warning: No xauth data; using fake authentication data for X11 forwarding. X11 forwarding request failed on channel 0 Since there's a window popping up at all, I doubt this is directly related to the problem getting the viewer to run. However, on systems *with* xauth installed 'echo $DISPLAY' shows a value, but on those *without* xauth, $DISPLAY is null. (So why am I getting any sort of X popup at all in that case?) Has anyone else seen this, and hopefully have a solution? The problem is actually two-fold: 1. Why 'X11 forwarding failed' and how to get rid of it/revert to behaviour in previous versions; and 2. Why is virt-viewer dying and how to keep it alive. (Again, how to revert to 'it *used* to work' conditions. ;-) ) Thanks! -- #ken B-)} Ken Coar, RHCE, RHCSA, Sanagendamgagwedweinini IT Engineering Tower, Red Hat/RDU "Millennium hand and shrimp!"

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[libvirt-users] difference between ` virsh save ` and `virsh snapshot
by zhijun liu 13 Nov '12

13 Nov '12

what the difference between ` virsh save ` and `virsh snapshot`? are they all used for backup for vm?have any details articles to introduce vm bakcup or image bakcup with libvirt? thanks in advance. liuzhijun

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[libvirt-users] Threads per vCPU and vCPU clock
by Vinicius Gonçalves Braga 13 Nov '12

13 Nov '12

Hi, is there a way to get the number of threads per vCPU and the vCPU clock? Thanks!

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[libvirt-users] the acl mode of files created by libvirtd
by Hao.Zhang 12 Nov '12

12 Nov '12

Hi, all I use virsh save command to dump a domain, the mode is 0600, and belongs to "root", how can i change the mode? Thanks. William -- That night, I thanked God for seeing me thought the day of days and prayed I would make it through tomorrow. I also promised that if some day I could get home again, I would find a nice peaceful town and spend rest of my life in peace.

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[libvirt-users] where is libvirt-python document??
by 宣铭艺 12 Nov '12

12 Nov '12

Hi libvirt users: Who can tell me where is the fucking doc? I want to use libvirt-python in my project.But I can't found the doc. I only found "TBD" in http://libvirt.org/guide/html/Application_Development_Guide-Language_Bindin… Did I miss something? Thanks. -- 樱宝宝: http://www.xuanmingyi.com

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[libvirt-users] the acl mode of files created by libvirtd
by Hao.Zhang 11 Nov '12

11 Nov '12

Hi, all I use virsh save command to dump a domain, the mode is 0600, and belongs to "root", how can i change the mode? William -- That night, I thanked God for seeing me thought the day of days and prayed I would make it through tomorrow. I also promised that if some day I could get home again, I would find a nice peaceful town and spend rest of my life in peace.

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[libvirt-users] [LXC][Openstack] Clarifications needed on usage of libvirt-lxc for openstack
by Sujay M 11 Nov '12

11 Nov '12

Hi everyone, I've some doubts regarding the usage/working of libvirt-lxc with openstack. I'm doing a project titled "Low density virtualization for Storage cloud" 1. Can i use libvirt for lxc with Openstack swift alone (excluding nova, glance and keystone)? If no what other openstack components should i use for virtualization? (Is it necessary to install openstack nova to do virtualization with libvirt-lxc?) 2. How virtualization for storage services work ? Any good articles. 3. I want to set up a cloud storage environment with low density virtualization ie lxc. I'm using Openstack swift (Object storage) for storage services. I want to virtualize this. Few resources on how i can do this using libvirt-lxc? -- Best Regards, Sujay M Final year B.Tech Computer Engineering NITK Surathkal contact: +918971897571

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