Hello,
I just updated from jaunty to karmic and then to lucid.
After that, I had the same problem and I could not boot my images any more.
Maybe apparmor was installed automatically and caused the problem when starting
a guest:
error: Failed to start domain 220_trxerdpd330_installtest
error: internal error unable to start guest: libvir: QEMU error : cannot change
to '114' group: Operation not permitted
after adding the following lines in /etc/apparmor.d/libvirt-qemu the problem
was solved:
capability setgid,
capability setuid,
The xml of my guest looks like this
<domain type='kvm'>
<name>220_trxerdpd330_installtest</name>
<uuid>87cb0f4f-1d8f-4e8b-2a1f-4cda94aca1ec</uuid>
<memory>524288</memory>
<currentMemory>524288</currentMemory>
<vcpu>2</vcpu>
<os>
<type arch='x86_64' machine='pc'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/kvm</emulator>
<disk type='file' device='disk'>
<source file='/home/vms/220_trxerdpd330_installtest.img'/>
<target dev='hda' bus='ide'/>
</disk>
<disk type='file' device='cdrom'>
<target dev='hdc' bus='ide'/>
<readonly/>
</disk>
<interface type='bridge'>
<mac address='00:16:36:4e:bd:fb'/>
<source bridge='br0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/4'/>
<target port='0'/>
</serial>
<console type='pty' tty='/dev/pts/4'>
<source path='/dev/pts/4'/>
<target port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='6220' autoport='no' keymap='de'/>
</devices>
</domain>
When I mount a readonly cd image, I get similar errors:
I think there are two issues:
1. libvirt should not chown/chgrp/chmod images, especially not readonly images
2. apparmor profile should correspond to libvirt.
--
setgid, setuid needed by /etc/apparmor.d/abstractions/libvirt-qemu
https://bugs.launchpad.net/bugs/579584
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