experience upgrade PVE4.1 to 4.2 on a DRBD9 cluster setup with LXC containers

[Ruben Waitz]

Hi,

I've the following configuration:
- 3 node cluster on PVE4.1
- High Availability with DRBD9
- LXC containers (on DRBD9)
- All LXCs reside on a single node

I want to upgrade the cluster nodes to PVE4.2, but I'm afraid differences between PVE 4.1 and 4.2 could defect the system (e.g. maybe differences between DRBD9 versions while upgrading the nodes).

What's the best/safest approach to upgrade the cluster while keeping uptime of the LXCs?

Hope to get some tips!

Regards,
Ruben