OpenVZ CT mount.nfs No such device

February 8th, 2009

Mounting NFS Shares from within OpenVZ Containers

Some of Debian's kernels with OpenVZ patches do not support NFS mounts within containers. Thankfully, some do. Its supposed to work with 2.6.26-1, but it doesn't. It does, however, work with a newer kernel, as well with the older Etch kernel!

When I try to mount the NFS file systems:

pro-101-gl:/var/www/virtual# mount -a
mount.nfs: No such device

My VZ (previous) setup:

  • Linux 2.6.26-1-openvz-686 #1 SMP Mon Dec 15 20:27:00 UTC 2008 i686 GNU/Linux
  • kernel.ve_allow_kthreads = 1
  • modprobe nfs
  • vzctl version 3.0.22
  • FEATURES="nfs:on"

The newer kernel which supports NFS:

Linux 2.6.26-2-openvz-amd64 #1 SMP Sun Jun 21 06:01:29 UTC 2009 i686 GNU/Linux

With the only slightly newer kernel, all I had to do was modprobe nfs in the OpenVZ host.

# vzctl exec 101 cat /proc/filesystems	ext3	ext2
nodev	sysfs
nodev	proc
nodev	tmpfs
nodev	devpts

On a machine with the original etch kernel (2.6.18), NFS client in a container works:

$ cat /proc/filesystems         ext3        ext2
nodev   rpc_pipefs
nodev   proc
nodev   sysfs
nodev   tmpfs
nodev   devpts
nodev   nfs


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