Joining Cluster with Guests

[zuluromeo]

Hello,

I am trying to join two established nodes and was wondering how this can be done in my situation. I have a LXC on the one node that has five mount points, adding around 800GB of extra space. I do not have a backup solution large enough. Is there a way I can just backup the container's root mount point and other settings? Then I can remove it and add it back on once I join the nodes?

Thank you.

 

[t.lamprecht]

Hi,

joining two nodes with existing guests is not supported natively as there can be clashes in VMIDs, storage, disk images and other things which cannot get resolved automatically.

It still can be done but needs quite some care, and for such things I always recommend testing it out first, either in a testlab setup or virtually with two virtual PVE instances.

If both nodes do not share any VMID it would get already quite a bit easier to manage. So how's the situation there?

In any way, joining a node won't touch the storages or guest disk images, but it will recreate the configuration file system (mounted on /etc/pve the backing database resides in /var/lib/pve-cluster though), so that is something which always needs to be backed up and partially restored afterwards.

 

[zuluromeo]

The two nodes are ones I play with in my home. So if I mess something up, I can start from scratch without losing anything. The two have separate storage and VM/LXC IDs are separate, no duplication.

Thank you.