Replace a Replica Set Member
If you need to change the hostname of a replica set member without changing the configuration of that member or the set, you can use the operation outlined in this tutorial. For example if you must re-provision systems or rename hosts, you can use this pattern to minimize the scope of that change.
To change the hostname for a replica set member modify the
members[n].host field. The value of
members[n]._id field will not change
when you reconfigure the set.
See Replica Set Configuration and
rs.reconfig() for more information.
To change the hostname to
mongo2.example.net for the replica set
member configured at
members, issue the following sequence of
cfg = rs.conf() cfg.members.host = "mongo2.example.net" rs.reconfig(cfg)