Upgrade Path from 4.4 to 5.1

[eric_f]

Hey everyone,

I've been reading a lot about the upgrade path from 4.4 to 5.1 and I just wanted to clarify that I understand everything I've read.

My current setup is a 3 node cluster running Ceph Jewel. Ideally, I'd like to be able to do the upgrade with zero downtime, and I believe it should be possible based on what I've read.

The process would look like this:

- Upgrade Ceph from Jewel to Luminous. I'm hoping I can do this and leave everything else at its current version until I'm happy that everything is fine. I also believe I can do this with 0 downtime?
- Migrate all VM's off of one node to the other two
- Upgrade Proxmox on the now empty node to version 5.1
- Test everything
- Migrate all VM's from one of the other nodes to the now 5.1 version of Proxmox
- Upgrade the second node
- Repeat for the final node

Does anybody see any pitfalls or holes in my logic?

Cheers,
Eric

 

[robertb]

I just did the same procedure.
Watch out for network interfaces being auto-renamed.
The upgrade process failed once on every node, a simple apt-get install -f fixed it.
However, since the upgrade i recently get a "501 too many open files" from the webui (no lxc containers in use).
This might result in api calls failing for example.

Anything else went flawless, upgrading is quite easy.