* Root password of a cluster node is required for adding nodes.
-NOTE: It is not possible to mix Proxmox VE 3.x and earlier with
-Proxmox VE 4.0 cluster nodes.
+NOTE: It is not possible to mix {pve} 3.x and earlier with {pve} 4.X cluster
+nodes.
+
+NOTE: While it's possible for {pve} 4.4 and {pve} 5.0 this is not supported as
+production configuration and should only used temporarily during upgrading the
+whole cluster from one to another major version.
Preparing Nodes
`ssh`) or the API, which we have a GUI implementation for (__Datacenter ->
Cluster__).
+While it's often common use to reference all other nodenames in `/etc/hosts`
+with their IP this is not strictly necessary for a cluster, which normally uses
+multicast, to work. It maybe useful as you then can connect from one node to
+the other with SSH through the easier to remember node name.
+
[[pvecm_create_cluster]]
Create the Cluster
------------------
Login via `ssh` to the first {pve} node. Use a unique name for your cluster.
-This name cannot be changed later. The cluster name follows the same rules as node names.
+This name cannot be changed later. The cluster name follows the same rules as
+node names.
----
hp1# pvecm create CLUSTERNAME
----
-CAUTION: The cluster name is used to compute the default multicast
-address. Please use unique cluster names if you run more than one
-cluster inside your network.
+CAUTION: The cluster name is used to compute the default multicast address.
+Please use unique cluster names if you run more than one cluster inside your
+network. To avoid human confusion, it is also recommended to choose different
+names even if clusters do not share the cluster network.
To check the state of your cluster use: