[TUTORIAL] lxc mount zfs pool

[hifloh]

I want to share the results of me trying to mount multiple zvols in an lxc container to share them using smb/nfs/sftp
The command outputs are trimmed to only include the relevant parts.

Goal:
Gounting ZFS-Pool into lxc Container.

Prerequisites

• Proxmox VE 8.2.2
• Container 102 (to mount to)
• A Zpool
  

  $ zfs list
  NAME        MOUNTPOINT
  tank        /tank
  tank/zvolA  /tank/zvolA
  tank/zvolB  /tank/zvolB

While researching I found 2 ways to do it.

1. Mount point
   Mount points are the Proxmox way of mounting local folders inside a container and should always be preferred. Sadly mount points do not support recursive mounts so we have to add a line for each zvol.
   

   $ cat /etc/pve/lxc/102.conf
   mp0: /tank,mp=/mnt/tank
   mp1: /tank/zvolA,mp=/mnt/tank/zvolA
   mp2: /tank/zvolB,mp=/mnt/tank/zvolB

   when often creating new zvols this is a verry tedious solution.
2. lxc.mount.entry
   for mounting all zvols using a single line we can use lxc.mount.entry
   

   $ cat /etc/pve/lxc/102.conf
   mp0: /mnt,mp=mnt/tank
   lxc.mount.entry: /tank mnt/tank none rbind 0 0

   This has the same effect as the previous variant with the added benefit of no configfile edits for new zvols.
   The first line is only needed at the first start. There are some steps the mount point does that lxc.mount.entry don't.
   In the container the second line gets mounted.