Keep or reuse lxc volume

[rwanito]

Hi !

I use LXC to run services.
But, if a service goes down or be corrupted I want to remove the LXC container and renew it.
The same case if I upgrade the rootfs.

But, I have mount points that contain data and I want to keep them or reuse them without delete sensitive data.
My volumes are on a ceph rbd storage.

I'm unable to locate the disk and in fact to save it.

Is exisist a way to :
- Save data volume,
- Remove container,
- recreate the container,
- rebind the data volume

Thanks for your work !
Erwan

 

[Stefan_R]

You can edit the config file directly (located in /etc/pve/lxc/<vmid>.conf) and remove the line specifiying your mountpoint (e.g. mp0: /some/path,mp=/mnt,size=16G, copy it somewhere else). This will not touch the data. Then simply delete and recreate your container, and after that's done, add the 'mp' options back into the new config file. The new container now references the data from the old one.

 

[sive.host]

If you do not want to edit the config file directly you can use:
pct move-volume 100 mp0 --target-vmid 200 --target-volume mp1
It just reassigns owner of the volume at mount point mp0 on ct number 100 to mount point 1 on ct number 200.