Bookmarks for February 4th through February 6th

These are my links for February 4th through February 6th:

Bookmarks for February 3rd through February 4th

These are my links for February 3rd through February 4th:

Bookmarks for January 9th through January 11th

These are my links for January 9th through January 11th:

Bookmarks for December 13th through December 14th

These are my links for December 13th through December 14th:

Bookmarks for June 20th through December 13th

These are my links for June 20th through December 13th:

Lucid libvirt

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:

Random MAC address for libvirt

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>
"

Bookmarks for April 15th through April 20th

These are my links for April 15th through April 20th:

Bookmarks for April 3rd through April 11th

These are my links for April 3rd through April 11th:

Bookmarks for March 4th through March 7th

These are my links for March 4th through March 7th:


Warning: require_once(/home/emptysands/stateless.geek.nz/wp-content/themes/copyblogger/footer.php) [function.require-once]: failed to open stream: Permission denied in /home/emptysands/stateless.geek.nz/wp-includes/template.php on line 441

Fatal error: require_once() [function.require]: Failed opening required '/home/emptysands/stateless.geek.nz/wp-content/themes/copyblogger/footer.php' (include_path='/home/emptysands/stateless.geek.nz/wp-content/plugins/openid/lib:.:/usr/local/lib/php:/usr/local/php5/lib/pear') in /home/emptysands/stateless.geek.nz/wp-includes/template.php on line 441