Upgrading from 5.4-15 to current/newer release

[thingyt]

I inherited a system setup by a former employee that I found out is running the very old Proxmox VE version 5.4-15.

I'm wondering what it would take to try and get it current?
Is there an upgrade path that might work for me to not have to rebuild everything?
Should I just start from scratch?

We currently have 3 Nodes, all of which have plenty of spare computing power and storage space.

With that in mind, I could potentially move everything off one of the nodes, remove it, create a new 8.3 install and create new VMs and get them all ready to go before turning off the old ones and moving to the new ones.

The other question would be, since it is working, is it worth trying to update? It is used almost entirely internally and has nothing publicly available that is hosted on any the VMs.

 

[cwt]

Usually an upgrade should be done from one version to another. 5 to 6, 6 to 7 and 7 to 8. But if you have ressources left and the old system has no special configurations I personally would migrate the VMs, perform a clean install of V8 and re-migrate the VMs.

 

[fiona]

Hi,
direct migration between versions that differ by more than one major release might not work. In fact, you should not have nodes that differ by more than one major release in the same cluster. To make the approach with fresh install work, you can always back-up guests in the old version and restore guests in the new version. Best to restore the backups on the freshly installed node before removing the old instances of the guests of course.