Upgrading proxmox cluster from 5.6 to 6

[Conacious]

Hi everyone,
Im guessing if we can upgrade our proxmox cluster node by node.
We have a 9 nodes cluster and we would like to upgrade like 1 node every day.
Proxmox 5.6 is compatible with other proxmox 6.0 nodes?

Thank you very much.

Best Reggards,

Víctor.

 

[Stoiko Ivanov]

The upgrade from PVE 5.4 (not sure where you have the 5.6 from - there is no such release) to 6.0 is quite well explained on the upgrade page in the wiki: https://pve.proxmox.com/wiki/Upgrade_from_5.x_to_6.0

make sure to read it thoroughly (e.g. you will need to upgrade corosync on all nodes first )

I hope this helps!

 

[Conacious]

Yes sorry it was a mistake.

I have alredy read the wiki but I'm not sure if I can upgrade the nodes 1 by 1 or we have to do a massive upgrade of all nodes at once. We alredy have corosync 3 on all nodes.

Thanks.

 

[Stoiko Ivanov]

Usually you:
* migrate all (important) guests away from the node you want to upgrade
* upgrade the node
* migrate the (important) guests from another node to this node
* upgrade this second node
and so on

As for the timeframe - In general running a cluster of mixed versions for a longer time is nothing that is tested too much - so if you runt into problems you might need to speed up the upgrade.

Apart from that - migration is generally only tested from an older version (5.4) to a newer version (6.0) not the other way around (could still work (with some drawbacks - e.g. offline migration instead of live-migration , but as said not tested too well)

Also make sure to check the pve5to6 script on all nodes before beginning!

 

[Lokytech]

my 2 cents after upgrading my cluster from 5.4 to 6, do update fast. Node by node i followed the tutorial for proxmox upgrade as well as ceph.
When i was in a mixed versions, corosync was losing synchronization. I had to stop corosync and restart it in foreground "corosync -f" on all node until the cluster was sane. Only after i stopped one corosync -f and restart pvecluster.