Add proxmox 5.x to Proxmox Culster ver 4.x

[D.P.]

Hi!
I have Proxmox cluster version 4.4 with Ceph and I'm going to add to it a new brand server with Proxmox version 5.1.

Can there be any problems? Do I have anything to pay attention to?
I plan to upgrade all servers to version 5.1.

Regards,
Darek

 

[Alwin]

This link should answer you questions, there is a link in the intro section that points to a more exact answer.
https://pve.proxmox.com/wiki/Upgrade_from_4.x_to_5.0

 

[D.P.]

Thank you for this tip.
Can I mix Proxmox 4.x and 5.1 hosts in one cluster?

 

[VGusev2007]

Thank you for this tip.
Can I mix Proxmox 4.x and 5.1 hosts in one cluster?

NO!

 

[D.P.]

So, If I want to upgrade Proxmox 4.4 cluster to 5.1: I must shutdown all cluster's hosts and
upgrade host one by one according to this document: https://pve.proxmox.com/wiki/Upgrade_from_4.x_to_5.0

 

[Alwin]

So, If I want to upgrade Proxmox 4.4 cluster to 5.1: I must shutdown all cluster's hosts and
upgrade host one by one according to this document: https://pve.proxmox.com/wiki/Upgrade_from_4.x_to_5.0

Where in the wiki article does it say that? You can mix 4.x with 5.x for the purpose of the upgrade. On migration of your VMs/CTs you might not be able to migrate back to the 4.x hosts.

 

[D.P.]

I've found this thread: https://forum.proxmox.com/threads/4-4-and-5-x-version-in-the-same-cluster.37170/

 

[VGusev2007]

I've found this thread: https://forum.proxmox.com/threads/4-4-and-5-x-version-in-the-same-cluster.37170/

Yes. I think you can use ansible for that.
For exampe:

Prepare:

• apt-get update in one node
• copy /var/lib/apt/lists folder to ansible host
• create apt-cacher-ng

Run ansible on all servers with step like this:

• do snapshot of your data+os
• copy /var/lib/apt/lists
• Setup apt-cacher-ng address.
• Disable cluster network.
• Do apt-get distr-upgrade in all machine.
• Reboot all machine

Enjoy! This is suitable for simple cluster. You need to test it in your test lab.