Lucid does not seem to work well with libvirt/kvm, there are several bugs that seem to be fixed in Maverick but not in Lucid.
From syslog:
error : qemuSetupCgroup:1955 : Unable to create cgroup for DOMAIN: No such file or directory
error : qemuRemoveCgroup:2045 : internal error Unable to find cgroup for DOMAIN#012
Re: [libvirt] FYI, “Unable to create cgroup for …”
This is a bug in systemd. It periodically scans all mounted cgroups
and deletes any directories which don’t contain any attached processes.
Needless to say this breaks libvirt, and possibly other apps, which
don’t expect 3rd parties to be deleting their directories.
https://bugzilla.redhat.com/show_bug.cgi?id=678555
Best solution for this that I’ve found on lucid is: Bug 696218 – Unable to create cgroup: No such file or directory
I was able to solve it by modifying the configuration in the file
/etc/libvirt/qemu.conf:
cgroup_controllers = [ ]
setgid, setuid needed by /etc/apparmor.d/abstractions/libvirt-qemu
=== modified file 'apparmor.d/abstractions/libvirt-qemu'
--- apparmor.d/abstractions/libvirt-qemu 2010-04-30 15:33:20 +0000
+++ apparmor.d/abstractions/libvirt-qemu 2010-05-12 17:26:56 +0000
@@ -8,6 +8,8 @@
capability dac_override,
capability dac_read_search,
capability chown,
+ capability setgid,
+ capability setuid,
Libvirt/kvm permissions/ownership issue on upgrade from Karmic to Lucid and error: operation failed: failed to retrieve chardev info in qemu with ‘indev’
libvirtError: internal error unable to start guest: libvir: QEMU
error : cannot set ownership
or
error: operation failed: failed to retrieve chardev info in qemu with 'indev'
Add the following to /etc/libvirt/qemu.conf:
# The user ID for QEMU processes run by the system instance
#user = "libvirt-qemu"
user = "root"
# The group ID for QEMU processes run by the system instance
group = "kvm"
map serial port throws “chardev: opening backend “tty” failed”
There seems to be a problem with the apparmor profile of libvirt (see bug #54579). After adding the line to /etc/apparmor.d/abstractions/libvirt-qemu and reloading the profile it worked for me.
/dev/ttyS* rw,
Few other links:
Snippet for generating a random MAC address. Useful if adding interfaces to a libvirt xml define file.
MACADDR="52:54:$(dd if=/dev/urandom count=1 2>/dev/null | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\).*$/\1:\2:\3:\4/')";
echo $MACADDR
echo "
<interface type='bridge'>
<mac address='$MACADDR'/>
<source bridge='br233'/>
<model type='virtio'/>
</interface>
"
These are my links for April 15th through April 20th:
These are my links for March 4th through March 7th:
Ubuntu recently change their package names for kvm. This comment posted on qemu-0.11.0 Released provides an explanation:
qemu-kvm includes features and fixes from upstream qemu and so takes its naming scheme from upstream qemu. You can think of it as qemu optimized for kvm. Note too that qemu-kvm does not include the kernel module but only the userspace and considered to be stable.
kvm-xx on the other hand is the development branch of kvm and not considered to be stable. It’s naming scheme is arbitrary and it also takes features from upstream qemu.
…
kvm-kmod is different to kvm-xx. You can think of kvm-kmod as a subset of the kvm-xx. KVM-xx = userspace + kernel where kvm-kmod is the kernel part of it and qemu-kvm is the userspace part (the guest process itself). You can apply the kvm-kmod to any distro version or linux version.. it’s just the kernel driver. However, without the userspace part, you can’t do much with it.