Creating a two-node cluster
A two-node cluster is an exception to the rule that a cluster is functional only when a minimum of (n/2 +1) nodes, where n is the number of cluster nodes, are able to serve traffic. If that formula were applied to a two-node cluster, the cluster would fail if one node went down (n/2 +1=2).
A two-node cluster is functional even if only one node is able to serve traffic.
Creating a two node cluster is the same as creating any other cluster. You must add one node as the configuration coordinator and the other node as the other cluster node.
Incremental configuration synchronization is not supported in a two-node cluster. Only full synchronization is supported.