Ceph cluster - how to properly reinstall Proxmox PVE on a node ?

[YAGA]

Hi,

I've to reinstall a node on a ceph cluster because nvme boot partition has been damaged but the partition with VM and LXC disk images is ok.

I've added a new nvme disk for a fresh install proxmox and I previously renamed pve volume (with VM and LXC disk images) with 'vgrename pve pveold'

I have reinstalled proxmox on a new nvme on the same node and I have now /dev/pve and /dev/pveold.

I have a few questions to save time and avoid any issues :

- Can I add the fresh reinstalled node to the cluster without any issue ?
- Can i keep my ceph disks with ceph data or I have to erase all the existing ceph data ?
- I have backups for the VM and LXC on this node but the backup is only every few days, how can I import the VM and LXC from /dev/pveold to the new /dev/pve ?

Kind regards,

 

[alexskysilk]

- Can I add the fresh reinstalled node to the cluster without any issue ?

Yes. there's really no need to keep the old node, just remove it from the cluster as described here: https://pve.proxmox.com/wiki/Cluster_Manager#_remove_a_cluster_node

- Can i keep my ceph disks with ceph data or I have to erase all the existing ceph data ?

Its... possible, but easier and more predictable to simply remove all the osds are recreate on the new node.

- I have backups for the VM and LXC on this node but the backup is only every few days, how can I import the VM and LXC from /dev/pveold to the new /dev/pve ?

I assume all your proxmox nodes are clustered, in which case this isnt necessary. if they're not this becomes a whole lot more complicated.

 

[YAGA]

I assume all your proxmox nodes are clustered, in which case this isnt necessary. if they're not this becomes a whole lot more complicated.

Thanks for your feedback. Please could give me more explanation on what you call clustered ? do want to say HA ?

 

[YAGA]

how can I migrate all the data (disks, cloud init disk...) from from /dev/pveold to the new /dev/pve ?

 

[alexskysilk]

Thanks for your feedback. Please could give me more explanation on what you call clustered ? do want to say HA ?

HA is the what. cluster is the how.

https://pve.proxmox.com/wiki/High_Availability_Cluster