replacing a node

https://pve.proxmox.com/wiki/Cluster_Manager#pvecm_join_node_to_cluster and https://pve.proxmox.com/wiki/Cluster_Manager#_remove_a_cluster_node should cover everything you need:
  1. Add the new node like described in the wiki
  2. Migrate all vms and containers from the old node to the new node
  3. Shutdown the old node, wipe the system disk
  4. Remove the old node like descriped in the wiki

Depending on your setup (whether you have Ceph or not, configured replication jobs etc) there might be more to it, so please read the linked instructions to ensure that you didn't missed anything .
 
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