Adding Proxmox VE 9 nodes to an existing PVE 8.3.2 cluster

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punkn123

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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
 
They should all be on the same version in the end. IIRC it’s recommended or needed to be on the latest 8.x to upgrade to 9 so I’d just upgrade the older nodes to 8.4 first.
 
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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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