On Tue, Jun 07, 2016 at 08:24:14AM +0200, Peter Krempa wrote:
> On Mon, Jun 06, 2016 at 14:25:23 -0500, Roy Keene wrote:
> > Patch to libvirt master to avoid failing when a user ID is specified,
> > e.g. for <seclabel type='dac'>, that does not map to a user name.
> >
> > This is useful if you want to run each VM as a separate user and not
> > bother creating an /etc/passwd entry for each UID.
>
> For this use case you shall prefix the name with a +. Please refer to
> the documentation on seclabels.
Empirically that does not currently work:
# virsh dumpxml serial | grep --after 2 '<seclabel'
<seclabel type='static' model='dac' relabel='no'>
<label>+21421:+12421421</label>
</seclabel>
# virsh start serial
error: Failed to start domain serial
error: Cannot access storage file '/var/lib/libvirt/images/demo.qcow2' (as
uid:21421, gid:12421421): Success
# ls -al /var/lib/libvirt/images/demo.qcow2
-rw-r--r--. 1 21421 12421421 197120 Apr 30 2015
/var/lib/libvirt/images/demo.qcow2
Looking at the libvirtd logs we see
2016-06-07 14:49:13.724+0000: 13490: debug : qemuDomainCheckDiskPresence:3954 :
Checking for disk presence
2016-06-07 14:49:16.551+0000: 13490: error : virGetUserEnt:801 : Failed to find
user record for uid '21421'
2016-06-07 14:49:16.551+0000: 13490: error :
virStorageFileGetMetadataRecurse:3114 : Cannot access storage file
'/var/lib/libvirt/images/demo.qcow2' (as uid:21421, gid:12421421): Success
So even though the QEMU driver has honoured the '+' syntax, some of the
things QEMU is calling appears to be trying to resolve the UID back into
a user password record and failing.
Regards,
Daniel
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