[solved] Update an Proxmox Cluster with 5 Nodes from 3.1 to 3.2

Hello,

we running 5 Nodes in a proxmox 2.0 cluster with 3.1. We have on all nodes the Community Subscription. I don't know, we never have done an Upgrade before from a cluster. So what is the right way to do that. Can we go on every node in the Webinterface on upgrade, and that it's. (Maybe an reboot when updateting kernel an qemu). Or is there a special to observe. Must every node have the same version of Proxmox?

Thanks for the information
Regards Fireon