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Replace a Replica Set Member![](/docs/v5.2/assets/link.svg)
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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.
Operation![](/docs/v5.2/assets/link.svg)
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.
Example![](/docs/v5.2/assets/link.svg)
To change the hostname to mongo2.example.net
for the replica set
member configured at members[0]
, issue the following sequence of
commands:
cfg = rs.conf() cfg.members[0].host = "mongo2.example.net" rs.reconfig(cfg)