By default OpenVZ CT in proxmox don't allow run nfs-kernel-server. To enable it, you must to active the nfsd feature in the container.

This method is possible that don't work with NFSv4.

• Stop the container:

  # vzctl stop CTID

• Turn on nfsd feature in the container:

  # vzctl set CTID --feature nfsd:on --save

• Start the container:

  # vzctl start CTID

NOTE: CTID is means Container ID.

You can check if nfs-kernel-server is running:

# service nfs-kernel-server status

To show the export directories:

# showmount -e

• https://openvz.org/NFS_server_inside_container