Troubleshooting

Mounting NFS shares in LXC containers

Mounting NFS shares require elevated privileges. A better pattern is to mount the NFS shares on the cluster node and map the mount point directly in the container. These should be mapped with minimum permissions.

On the proxmox node mount NFS shares using FSTab instead of the WebGUI. Mounts created using the WebGUI are only mounted on first use, which generally leads to container mounting failures due to timeouts on the PVE host.

PVE (All Nodes)

/etc/fstab

0644 root:root

10.10.10.8:/d/backup /autofs/backup nfs4 ro,nfsvers=4,minorversion=2,proto=tcp,fsc,rsize=1048576,wsize=1048576,nocto,_netdev 0 0

LXC Container

Add a standard container mountpoint directed at the NFS mount.

/etc/pve/lxc/{ID}.conf

0644 root:root

mp0: volume=/autofs/backup,mp=/data/backup,ro=1

blocklayout failed

Message may be ignored.

open pipe file /run/rpc_pipefs/nfs/blocklayout failed: No such file or directory

Loading the blocklayoutdriver resolves the message but creates another one. Upstream bug is closed as will not fix.