Harald Dunkel wrote: > Hi folks, > > Since I have moved the image file of a domain to an NFS > partition I get an error message at start time: > > # virsh start mydomain > error: Failed to start domain mydomain > error: unable to set security context '110:140' on > '/storage/mydomain/vda.img': Invalid argument What is security_driver set to in /etc/libvirt/qemu.conf? It appears to be the security driver trying to update the security context stored on the filesystem as an extended attribute. The NFS v4 filesystem currently lacks extended attribute support. Without extended attributes there isn't a place to store the security context associated with the image file, hence the error. I've CC'd James Morris who, in addition to working on the original libvirt security driver implementation, happens to be spearheading the NFS xattr support. Hopefully he can provide some more information.

> > The /storage partition is mounted with these options: > > # cat /proc/mounts | grep /storage > nasl002:/storage/ /storage nfs4 > rw,relatime,vers=4,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=172.19.96.31,addr=172.19.96.213 > 0 0 > > If I use a local disk instead, then there is no such > problem. The fact that it works on local disk is likely attributable to the local filesystem supporting extended attributes. Examples of these filesystems include ext2/3/4 and xfs. > > libvirt is version 0.7.7-4, as included with Debian. > Any helpful comment would be highly appreciated. Out of curiosity, are you using the SELinux support in Debian? --Spencer > > > Regards > > Harri >

Hi folks, On 04/15/10 22:06, Spencer Shimko wrote: > What is security_driver set to in /etc/libvirt/qemu.conf? > > It is not set at all. AFAICS there is no man page for qemu.conf, but according to KISS I had assumed that the security_driver stuff is disabled by default. Is it?

> Out of curiosity, are you using the SELinux support in Debian? > > For both NFS client and server: selinux is enabled in the kernel. Debian's libselinux1 package is installed, too, because it seems to be an essential dependency for other packages. There are no selinux policies set up, and the selinux-basics package is not installed, either. Would you suggest to rebuild the kernel without selinux?

BTW, the NFS server uses reiserfs for its exported partitions. Regards Harri