[HowTo]: Mount Additional Storage in OMV LXC on Proxmox

[MickLesk]

Mounting Additional Storage in OMV LXC on Proxmox

This guide explains how to mount additional storage in an OpenMediaVault (OMV) container running on Proxmox Virtual Environment (PVE).

Prerequisites

• Proxmox Virtual Environment (PVE) host
• Existing OMV LXC container

Steps

1. Create OMV LXC Container

Create an OMV LXC container on your Proxmox host using the corresponding script. Ensure the container is set to "Privileged" during creation.

2. Add Storage Mount Point

1. Stop the OMV container.
2. In the Proxmox shell, add a mount point for additional storage:

   pct set <CT_ID> -mp0 local-lvm:10,mp=/data
   

   This will create a 10GB storage mount point at /data.

3. Find Block Device IDs

1. Run lvdisplay in the Proxmox shell.
2. Look for the Logical Volume like /dev/pve/vm-<CT_ID>-disk-X.
3. Note the "Block device" numbers, e.g., 253 9.

4. Create Mount Hook Script

1. Create the mount hook script file:

   echo '#!/bin/sh' > /var/lib/lxc/<CT_ID>/mount-hook.sh
   echo 'mknod -m 777 ${LXC_ROOTFS_MOUNT}/dev/sda1 b 253 9' >> /var/lib/lxc/<CT_ID>/mount-hook.sh
   

   Replace 253 9 with the block device numbers you found in the previous step.
2. Make the script executable:

   chmod a+x /var/lib/lxc/<CT_ID>/mount-hook.sh
   

5. Add Hook to LXC Config

Edit the LXC config file:

echo 'lxc.hook.autodev: /var/lib/lxc/<CT_ID>/mount-hook.sh' >> /etc/pve/lxc/<CT_ID>.conf

6. Start the OMV Container

Start the OMV container.

7. Mount the Storage

1. In the OMV web interface, go to "Storage" -> "File Systems".
2. Click "Mount existing file system" and add /dev/sda1.

At this point, the additional storage should be available in the OMV interface. You can then create shares, set permissions, and use the storage as needed.

Please note that some users reported issues with this method, particularly around the block device numbers changing after a reboot. In such cases, you may need to modify the mount hook script to use the LVM volume UUID instead of the block device numbers.

Original-Thread: tteck/Proxmox#1075