Register both nodes; example on node1:

        $ repmgr -f /etc/repmgr.conf bdr register
        NOTICE: attempting to install extension "repmgr"
        NOTICE: "repmgr" extension successfully installed
        NOTICE: node record created for node 'node1' (ID: 1)
        NOTICE: BDR node 1 registered (conninfo: host=node1 dbname=bdrtest user=repmgr)

and on node1:

        $ repmgr -f /etc/repmgr.conf bdr register
        NOTICE: node record created for node 'node2' (ID: 2)
        NOTICE: BDR node 2 registered (conninfo: host=node2 dbname=bdrtest user=repmgr)

The repmgr extension will be automatically created when the first node is registered, and will be propagated to the second node.

At this point the meta data for both nodes has been created; executing repmgr cluster show (on either node) should produce output like this:

        $ repmgr -f /etc/repmgr.conf cluster show
        ID | Name  | Role | Status    | Upstream | Location | Connection string
       ----+-------+------+-----------+----------+--------------------------------------------------------
        1  | node1 | bdr  | * running |          | default  | host=node1 dbname=bdrtest user=repmgr connect_timeout=2
        2  | node2 | bdr  | * running |          | default  | host=node2 dbname=bdrtest user=repmgr connect_timeout=2

Additionally it's possible to display log of significant events; executing repmgr cluster event (on either node) should produce output like this:

        $ repmgr -f /etc/repmgr.conf cluster event
        Node ID | Event        | OK | Timestamp           | Details
       ---------+--------------+----+---------------------+----------------------------------------------
        2       | bdr_register | t  | 2017-07-27 17:51:48 | node record created for node 'node2' (ID: 2)
        1       | bdr_register | t  | 2017-07-27 17:51:00 | node record created for node 'node1' (ID: 1)
      

At this point there will only be records for the two node registrations (displayed here in reverse chronological order).