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mongodb 分片集群切换单个分片副本集primary的正确步骤

2016-07-14 21:58 776 查看

1、将原来的primay降为secondary

shard1:PRIMARY> rs.stepDown();
2016-07-11T20:35:30.134+0800 I NETWORK DBClientCursor::init call() failed
2016-07-11T20:35:30.141+0800 E QUERY Error: error doing query: failed
at DBQuery._exec (src/mongo/shell/query.js:83:36)
at DBQuery.hasNext (src/mongo/shell/query.js:240:10)
at DBCollection.findOne (src/mongo/shell/collection.js:187:19)
at DB.runCommand (src/mongo/shell/db.js:58:41)
at DB.adminCommand (src/mongo/shell/db.js:66:41)
at Function.rs.stepDown (src/mongo/shell/utils.js:1006:15)
at (shell):1:4 at src/mongo/shell/query.js:83
2016-07-11T20:35:30.144+0800 I NETWORK trying reconnect to 10.254.3.63:27017 (10.254.3.63) failed
2016-07-11T20:35:30.146+0800 I NETWORK reconnect 10.254.3.63:27017 (10.254.3.63) ok
shard1:SECONDARY>

2、移除原来的primay库

如果不及时使用rs.remove移除旧的主库的话，mongodb运行中有一定概率会将旧的主库自动从secondary升级为primary的，所以一旦primary切换成功后，需要remove旧的primary库以防万一。

Remove执行过程如下：
[mongodb@db_m1_slave_1 ~]$ /usr/local/mongodb-linux-x86_64-3.0.3/bin/mongo 10.254.3.72:27027
MongoDB shell version: 3.0.3
connecting to: 10.254.3.72:27027/test
shard1:PRIMARY> rs.remove("10.254.3.63:27017");
2016-07-11T20:36:01.314+0800 I NETWORK DBClientCursor::init call() failed
2016-07-11T20:36:01.323+0800 E QUERY Error: error doing query: failed
at DBQuery._exec (src/mongo/shell/query.js:83:36)
at DBQuery.hasNext (src/mongo/shell/query.js:240:10)
at DBCollection.findOne (src/mongo/shell/collection.js:187:19)
at DB.runCommand (src/mongo/shell/db.js:58:41)
at DB.adminCommand (src/mongo/shell/db.js:66:41)
at Function.rs.remove (src/mongo/shell/utils.js:1031:23)
at (shell):1:4 at src/mongo/shell/query.js:83
2016-07-11T20:36:01.326+0800 I NETWORK trying reconnect to 10.254.3.72:27027 (10.254.3.72) failed
2016-07-11T20:36:01.327+0800 I NETWORK reconnect 10.254.3.72:27027 (10.254.3.72) ok
shard1:PRIMARY>
shard1:PRIMARY>
shard1:PRIMARY> rs.status();
{
"set" : "shard1",
"date" : ISODate("2016-07-11T12:36:20Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "10.254.3.62:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 19,
"optime" : Timestamp(1468240561, 1),
"optimeDate" : ISODate("2016-07-11T12:36:01Z"),
"lastHeartbeat" : ISODate("2016-07-11T12:36:19Z"),
"lastHeartbeatRecv" : ISODate("2016-07-11T12:36:20Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "syncing to: 10.254.3.72:27027",
"syncingTo" : "10.254.3.72:27027"
},
{
"_id" : 2,
"name" : "10.254.3.72:27017",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER",
"uptime" : 19,
"lastHeartbeat" : ISODate("2016-07-11T12:36:19Z"),
"lastHeartbeatRecv" : ISODate("2016-07-11T12:36:20Z"),
"pingMs" : 0
},
{
"_id" : 3,
"name" : "10.254.3.72:27027",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 33237,
"optime" : Timestamp(1468240561, 1),
"optimeDate" : ISODate("2016-07-11T12:36:01Z"),
"self" : true
}
],
"ok" : 1
}
shard1:PRIMARY>

3、查看副本集新运行状态

[mongodb@db_m2_slave1 ~]$ /usr/local/mongodb-linux-x86_64-3.0.3/bin/mongo 10.254.3.72:27027
MongoDB shell version: 3.0.3
connecting to: 10.254.3.72:27027/test
shard1:PRIMARY> rs.status();
{
"set" : "shard1",
"date" : ISODate("2016-07-11T14:13:37Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "10.254.3.62:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 5856,
"optime" : Timestamp(1468246415, 1),
"optimeDate" : ISODate("2016-07-11T14:13:35Z"),
"lastHeartbeat" : ISODate("2016-07-11T14:13:36Z"),
"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),
"pingMs" : 4,
"syncingTo" : "10.254.3.72:27027"
},
{
"_id" : 2,
"name" : "10.254.3.72:27017",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER",
"uptime" : 5856,
"lastHeartbeat" : ISODate("2016-07-11T14:13:36Z"),
"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),
"pingMs" : 0
},
{
"_id" : 3,
"name" : "10.254.3.72:27027",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 39074,
"optime" : Timestamp(1468246415, 1),
"optimeDate" : ISODate("2016-07-11T14:13:35Z"),
"self" : true
}
],
"ok" : 1
}
shard1:PRIMARY>
参考文档地址：http://docs.mongoing.com/manual-zh/reference/configuration-options.html
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