Proxmox PVE

/etc/pve/storage.cfg                                      # storage config (ip, fingerprint etc.)
/etc/pve/nodes/<node name>/qemu-server/<vm id>.conf       # vm hardware config

pvesm set <storage id> --password                         # set password for storage

pvecm status
pvecm nodes
pvecm expected 1                                          # set expected nodes to 1 for quorum
pvecm delnode <node_id>

Node config files

/etc/pve/nodes/<node>

apt update
apt apt full-upgrade