LXC Bind Mounts

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Introduction

This is an experimental feature.

Bind mounts allow you to access a directory, or a storage volume from your Proxmox VE host inside a container. There can be many purposes:

  • Accessing your home directory in the guest
  • Accessing a USB device directory in the guest
  • Accessing a NFS mount from in the host in the guest

Note that the device you want to use has to be already accessible in the pve host. For security reasons, it is not possible to mount a device of NFS share directly in the guest.

Step by step examples

Suppose you want to access the following directories in your LXC container with ID100:

  • /target which is a local directory
  • /mnt/pve/freenas which is a NFS mounted directory

Then you need to add the following parameters to /etc/pve/lxc/100.conf

mp0: /target/test,mp=/target
mp1: /mnt/pve/freenas,mp=/mnt/pve/freenas

reboot your container and log in:

pct enter
mount | egrep '(target|freenas)'
/dev/dm-0 on /target type ext4 (rw,relatime,errors=remount-ro,data=ordered)
freenas.local:/mnt/TranstecThrough/exported

Caveats

Settings a bind mount, prevent the backup of the whole container. This is to prevent large exported directory that you had mounted in the guest.