A server will be in a Passive state in either one of the following:
To make a server become part of a cluster you can do either of the following:
In this page:
Click 'Bootstrap Cluster' to make the current passive server a part of a cluster.
Note: This option is only available when the server is in the Passive state.
Click to add a new node
This operation can also be done programatically. Read more here.
A cluster with 2 nodes
Now your cluster contains 2 nodes:
More nodes can be added as needed.