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Bob Grabar
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DOCS-54 replace rs.status with rs.config
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‎draft/tutorial/change-hostnames-in-a-replica-set.txt‎

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Original file line numberDiff line numberDiff line change
@@ -58,28 +58,56 @@ availability requirements, you may:
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Procedures
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----------
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.. _replica-set-change-hostname-no-downtime:
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Changing Hostnames while Maintaining the Replica Set's Availability
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. _givens:
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Given a :term:`replica set` with three members
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Given a :term:`replica set` with three members:
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- ``database0.example.net:27017`` (the :term:`primary`)
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- ``database1.example.net:27018``
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- ``database2.example.net:27019``
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This procedure changes the hostnames to the following, while maintaining
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the set's availability:
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And with the following :func:`rs.config()` output:
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.. code-block:: javascript
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{
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"_id" : "rs",
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"version" : 3,
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"members" : [
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{
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"_id" : 0,
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"host" : "database0.example.net:27017"
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},
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{
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"_id" : 1,
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"host" : "database1.example.net:27018"
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},
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{
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"_id" : 2,
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"host" : "database2.example.net:27019"
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}
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]
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}
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The following procedures change the members' hostnames as follows:
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- ``mongodb0.example.net:27017`` (the primary)
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- ``mongodb1.example.net:27018``
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- ``mongodb2.example.net:27019``
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Use the procedure appropriate to your situation.
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.. _replica-set-change-hostname-no-downtime:
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Changing Hostnames while Maintaining the Replica Set's Availability
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This procedure uses the above ":ref:`givens <givens>`".
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#. For each :term:`secondary` in the replica set, perform the
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following sequence of operations:
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@@ -148,81 +176,50 @@ the set's availability:
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#. Open a :program:`mongo` shell connected to the primary.
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#. To confirm the new configuration, call :func:`rs.status()` in the
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#. To confirm the new configuration, call :func:`rs.config()` in the
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:program:`mongo` shell.
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Your output should look similar to this:
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Your output should resemble:
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.. code-block:: javascript
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{
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"set" : "rs",
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"date" : ISODate("2012-08-17T20:55:59Z"),
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"myState" : 1,
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"members" : [
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{
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"_id" : 0,
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"name" : "mongodb0.example.net:27017",
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"health" : 1,
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"state" : 1,
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"stateStr" : "PRIMARY",
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"optime" : {
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"t" : 1345235703000,
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"i" : 1
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},
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"optimeDate" : ISODate("2012-08-17T20:35:03Z"),
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"self" : true
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},
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{
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"_id" : 1,
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"name" : "mongodb1.example.net:27018",
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"health" : 1,
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"state" : 2,
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"stateStr" : "SECONDARY",
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"uptime" : 1260,
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"optime" : {
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"t" : 1345235703000,
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"i" : 1
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},
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"optimeDate" : ISODate("2012-08-17T20:35:03Z"),
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"lastHeartbeat" : ISODate("2012-08-17T20:55:58Z"),
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"pingMs" : 0
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},
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{
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"_id" : 2,
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"name" : "mongodb2.example.net:27019",
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"health" : 1,
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"state" : 2,
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"stateStr" : "SECONDARY",
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"uptime" : 1256,
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"optime" : {
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"t" : 1345235703000,
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"i" : 1
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},
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"optimeDate" : ISODate("2012-08-17T20:35:03Z"),
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"lastHeartbeat" : ISODate("2012-08-17T20:55:58Z"),
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"pingMs" : 0
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}
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],
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"ok" : 1
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}
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"_id" : "rs",
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"version" : 4,
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"members" : [
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{
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"_id" : 0,
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"host" : "mongodb0.example.net:27017"
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},
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{
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"_id" : 1,
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"host" : "mongodb1.example.net:27018"
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},
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{
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"_id" : 2,
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"host" : "mongodb2.example.net:27019"
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}
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]
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}
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.. _replica-set-change-hostname-downtime:
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Changing All Hostnames in Replica Set at Once
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This procedure uses the above ":ref:`givens <givens>`".
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#. Stop all members in the :term:`replica set`.
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#. Restart each member *on a different port* and *without* using the
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:option:`--replSet <mongod --replset>` run-time option. Changing
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the port number during maintenance prevents clients from connecting
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to this host while you perform maintenance. Use a command that
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resembles the following:
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to this host while you perform maintenance. Use the member's usual :option:`--dbpath`, which in this
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example is ``/data/db1``. Use a command that resembles the following:
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.. code-block:: sh
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mongod --dbpath /data/db/ --port 37017
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mongod --dbpath /data/db1/ --port 37017
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#. For each member of the replica set, perform the following sequence
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of operations:
@@ -249,11 +246,11 @@ Changing All Hostnames in Replica Set at Once
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cfg = db.system.replset.findOne( { "_id": "rs" } )
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cfg.members[0].host = "mdb0.example.net:27017"
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cfg.members[0].host = "mongodb0.example.net:27017"
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cfg.members[1].host = "mdb1.example.net:27018"
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cfg.members[1].host = "mongodb1.example.net:27018"
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cfg.members[2].host = "mdb2.example.net:27019"
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cfg.members[2].host = "mongodb2.example.net:27019"
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db.system.replset.update( { "_id": "rs" } , cfg )
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@@ -266,7 +263,7 @@ Changing All Hostnames in Replica Set at Once
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.. code-block:: sh
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mongod --dbpath /data/db/ --port 27017 --replSet rs
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mongod --dbpath /data/db1/ --port 27017 --replSet rs
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#. Connect to one of the :program:`mongod` instances
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using the :program:`mongo` shell. For example:
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mongo --port 27017
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#. To confirm that the set has reconfigured, call :func:`rs.status()` in the
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#. To confirm the new configuration, call :func:`rs.config()` in the
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:program:`mongo` shell.
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Your output should look similar to this:
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Your output should resemble:
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.. code-block:: javascript
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{
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"set" : "rs",
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"date" : ISODate("2012-08-17T20:55:59Z"),
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"myState" : 1,
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"members" : [
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{
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"_id" : 0,
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"name" : "mdb0.example.net:27017",
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"health" : 1,
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"state" : 1,
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"stateStr" : "PRIMARY",
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"optime" : {
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"t" : 1345235703000,
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"i" : 1
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},
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"optimeDate" : ISODate("2012-08-17T20:35:03Z"),
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"self" : true
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},
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{
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"_id" : 1,
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"name" : "mdb1.example.net:27018",
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"health" : 1,
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"state" : 2,
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"stateStr" : "SECONDARY",
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"uptime" : 1260,
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"optime" : {
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"t" : 1345235703000,
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"i" : 1
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},
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"optimeDate" : ISODate("2012-08-17T20:35:03Z"),
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"lastHeartbeat" : ISODate("2012-08-17T20:55:58Z"),
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"pingMs" : 0
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},
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{
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"_id" : 2,
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"name" : "mdb2.example.net:27019",
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"health" : 1,
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"state" : 2,
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"stateStr" : "SECONDARY",
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"uptime" : 1256,
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"optime" : {
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"t" : 1345235703000,
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"i" : 1
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},
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"optimeDate" : ISODate("2012-08-17T20:35:03Z"),
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"lastHeartbeat" : ISODate("2012-08-17T20:55:58Z"),
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"pingMs" : 0
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}
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],
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"ok" : 1
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}
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"_id" : "rs",
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"version" : 4,
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"members" : [
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{
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"_id" : 0,
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"host" : "mongodb0.example.net:27017"
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},
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{
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"_id" : 1,
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"host" : "mongodb1.example.net:27018"
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},
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{
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"_id" : 2,
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"host" : "mongodb2.example.net:27019"
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}
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]
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}

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