Adding Proxmox VE 9 nodes to an existing PVE 8.3.2 cluster

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punkn123

New Member
Jan 22, 2024
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Hello Guys,

I currently have a Proxmox VE cluster running version 8.3.2 with 4 nodes. Recently, I deployed 2 new nodes running Proxmox VE 9 and would like to add them to the existing 8.3.2 cluster.

Before proceeding, I’d like to confirm:

- Is it possible to join Proxmox VE 9 nodes to a PVE 8.3.2 cluster directly?
- If not, what is the recommended upgrade or migration path to integrate these nodes without downtime or data inconsistency?

Appreciate any guidance or best practices regarding mixed-version clusters or upgrade sequencing.

Regards,
Punkn
 
Just in case anyone is curious, I added a Proxmox 9.1 host to an 8.4 cluster without issues today. I even configured replication, as the plan is to upgrade an existing cluster to 9.1 and use this as a destinations to VMs to run while hosts are being upgraded.
 
sdet00 said:
Just in case anyone is curious, I added a Proxmox 9.1 host to an 8.4 cluster without issues today. I even configured replication, as the plan is to upgrade an existing cluster to 9.1 and use this as a destinations to VMs to run while hosts are being upgraded.
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I'd highly discourage anyone doing that on a production cluster. @SteveITS was correct, its wise to update, upgrade and then dist-upgrade to bring the whole platform to the same major and minor.
 
There was a thread earlier today. IIRC Proxmox posted they haven’t tested joining 9 to 8 so recommended installing 8, joining, then upgrading. YMMV I haven’t done anything with 9 yet.
 
I don't plan to leave it like this, I just needed a third node and a replacement system was supplied with Proxmox 9 on it already - was running out of time so just tried a join and it has worked OK so far. I will upgrade the remaining nodes over the coming days and update if there are any issues.
 
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