ReplicaSet – Elections

1.	Login into primary 

[[email protected] ~]$ mongo --port 27017

MongoDB shell version: 2.6.3
connecting to: 127.0.0.1:27017/test
myreplicaset:PRIMARY>

2.	Store configuration to a variable “config”

myreplicaset:PRIMARY> config=rs.conf();
{
"_id" : "myreplicaset",
"version" : 3,
"members" : [
{
"_id" : 0,
"host" : "localhost.localdomain:27017"
},
{
"_id" : 1,
"host" : "localhost.localdomain:27018"
},
{

"_id" : 2,
"host" : "localhost.localdomain:27019"
}
]
}

3.	Update priority of members myreplicaset:PRIMARY> config.members[0].priority=3

3

myreplicaset:PRIMARY> config.members[1].priority=1 1
myreplicaset:PRIMARY> config.members[2].priority=2 2

4.	Reconfigure ReplicaSet with new configurations myreplicaset:PRIMARY> 

rs.reconfig(config)
2014-07-08T15:08:24.009+0200 DBClientCursor::init call() failed
2014-07-08T15:08:24.012+0200 trying reconnect to 127.0.0.1:27017
(127.0.0.1) failed

2014-07-08T15:08:24.013+0200 reconnect 127.0.0.1:27017 (127.0.0.1) ok reconnected to server after rs command (which is normal)


5.	View ReplicaSet configuration myreplicaset:PRIMARY> rs.conf();


{
"_id" : "myreplicaset",
"version" : 4,
"members" : [
{
"_id" : 0,
"host" : "localhost.localdomain:27017",
"priority" : 3

},
{
"_id" : 1,
"host" : "localhost.localdomain:27018"
},
{
"_id" : 2,
"host" : "localhost.localdomain:27019",
"priority" : 2
}
]
}

6.	Check status of the ReplicaSet myreplicaset:PRIMARY> rs.status();


{
"set" : "myreplicaset",
"date" : ISODate("2014-07-08T13:09:19Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "localhost.localdomain:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1134,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),
"electionTime" : Timestamp(1404824025, 1),
"electionDate" : ISODate("2014-07-08T12:53:45Z"),
"self" : true
},
{
"_id" : 1,
"name" : "localhost.localdomain:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 56,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),
"lastHeartbeat" : ISODate("2014-07-08T13:09:17Z"),
"lastHeartbeatRecv" : ISODate("2014-07-08T13:09:18Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "syncing to:
localhost.localdomain:27017",
"syncingTo" : "localhost.localdomain:27017"
},
{
"_id" : 2,
"name" : "localhost.localdomain:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 56,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),

"lastHeartbeat" : ISODate("2014-07-08T13:09:17Z"),
"lastHeartbeatRecv" : ISODate("2014-07-08T13:09:19Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "syncing to:
localhost.localdomain:27017",
"syncingTo" : "localhost.localdomain:27017"
}
],
"ok" : 1
}

Exit from the primary

myreplicaset:PRIMARY> exit
bye

8. Stop the current master process

[[email protected] ~]$ sudo su [sudo] password for tom: [[email protected] tom]# cd /var/lib/mongo [[email protected] mongo]# ps -ef|grep mongo

root	2984	1	0	14:50 ?	00:00:03 mongod --port 27017 -
dbpath /var/lib/mongo/replicaset0 --logpath
/var/lib/mongo/replicaset0/log --replSet myreplicaset --fork --
smallfiles --nojournal			
root	3036	1	0	14:51 ?	00:00:02 mongod --port 27018 -
dbpath /var/lib/mongo/replicaset1 --logpath
/var/lib/mongo/replicaset1/log --replSet myreplicaset --fork --
smallfiles --nojournal			
root	3082	1	0	14:51 ?	00:00:02 mongod --port 27019 -
					
dbpath /var/lib/mongo/replicaset2 --logpath /var/lib/mongo/replicaset2/log --replSet myreplicaset --fork -- smallfiles --nojournal

	root	3699	3682  0	15:11 pts/2	00:00:00 grep mongo	
					
[[email protected]	mongo]#	kill -9 2984		

9. Login into mongo with priority 2

[[email protected] mongo]# mongo --port 27019

MongoDB shell version: 2.6.3
connecting to: 127.0.0.1:27019/test
myreplicaset:PRIMARY>



10.	Check configuration myreplicaset:PRIMARY> rs.conf();


{
"_id" : "myreplicaset",
"version" : 4,
"members" : [
{
"_id" : 0,
"host" : "localhost.localdomain:27017",
"priority" : 3

},
{
"_id" : 1,
"host" : "localhost.localdomain:27018"
},
{
"_id" : 2,
"host" : "localhost.localdomain:27019",
"priority" : 2
}
]
}

11.	Check ReplicaSet status myreplicaset:PRIMARY> rs.status();


{
"set" : "myreplicaset",
"date" : ISODate("2014-07-08T13:13:37Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "localhost.localdomain:27017",
"health" : 0,
"state" : 8,

"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),
"lastHeartbeat" : ISODate("2014-07-08T13:13:35Z"),
"lastHeartbeatRecv" : ISODate("2014-07-08T13:12:12Z"),
"pingMs" : 0
},
{
"_id" : 1,
"name" : "localhost.localdomain:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 312,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),
"lastHeartbeat" : ISODate("2014-07-08T13:13:35Z"),
"lastHeartbeatRecv" : ISODate("2014-07-08T13:13:36Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "syncing to:
localhost.localdomain:27019",
"syncingTo" : "localhost.localdomain:27019"
},
{
"_id" : 2,
"name" : "localhost.localdomain:27019",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1325,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),

"electionTime" : Timestamp(1404825141, 1),
"electionDate" : ISODate("2014-07-08T13:12:21Z"),
"self" : true
}
],
"ok" : 1
}

12.	Exit from the current primary


myreplicaset:PRIMARY> exit
bye


13.	Restart the killed process [[email protected] mongo]# rm replicaset0/mongod.lock

rm: remove regular file `replicaset0/mongod.lock'? yes

[[email protected] mongo]# mongod --port 27017 --dbpath /var/lib/mongo/replicaset0 --logpath /var/lib/mongo/replicaset0/log -- replSet myreplicaset --fork --smallfiles --nojournal

about to fork child process, waiting until server is ready for connections.

forked process: 5293
child process started successfully, parent exiting


14.	Login into the restarted process [[email protected] mongo]# mongo --port 27017

MongoDB shell version: 2.6.3
connecting to: 127.0.0.1:27017/test



15.	Check ReplicaSet configuration myreplicaset:PRIMARY> rs.conf();


{
"_id" : "myreplicaset",
"version" : 4,
"members" : [
{
"_id" : 0,
"host" : "localhost.localdomain:27017",
"priority" : 3

},
{
"_id" : 1,
"host" : "localhost.localdomain:27018"
},
{
"_id" : 2,
"host" : "localhost.localdomain:27019",
"priority" : 2
}
]
}


16.	Check ReplicaSet status myreplicaset:PRIMARY> rs.status();


{
"set" : "myreplicaset",
"date" : ISODate("2014-07-08T13:17:33Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "localhost.localdomain:27017",
"health" : 1,
"state" : 1,

"stateStr" : "PRIMARY",
"uptime" : 39,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),
"electionTime" : Timestamp(1404825417, 1),
"electionDate" : ISODate("2014-07-08T13:16:57Z"),
"self" : true
},
{
"_id" : 1,
"name" : "localhost.localdomain:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 38,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),
"lastHeartbeat" : ISODate("2014-07-08T13:17:33Z"),
"lastHeartbeatRecv" : ISODate("2014-07-08T13:17:33Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "syncing to:
localhost.localdomain:27019",
"syncingTo" : "localhost.localdomain:27019"
},
{
"_id" : 2,
"name" : "localhost.localdomain:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 38,
"optime" : Timestamp(1404824903, 1),
"optimeDate" : ISODate("2014-07-08T13:08:23Z"),

"lastHeartbeat" : ISODate("2014-07-08T13:17:33Z"),
"lastHeartbeatRecv" : ISODate("2014-07-08T13:17:32Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "syncing to:
localhost.localdomain:27017",
"syncingTo" : "localhost.localdomain:27017"
}
],
"ok" : 1
}


17.	Exit from the primary.


myreplicaset:PRIMARY> exit
bye

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