mongodb 副本集的维护(1)

一、修改副本集中各成员的优先级：

shard1:PRIMARY> conf=rs.conf()

{

"_id" : "shard1",

"version" : 3,

"protocolVersion" : NumberLong(1),

"members" : [

{

"_id" : 0,

"host" : "mongo01-jp:27027",

"arbiterOnly" : false,

"buildIndexes" : true,

"hidden" : false,

"priority" : 1,

"tags" : {

},

"slaveDelay" : NumberLong(0),

"votes" : 1

},

{

"_id" : 1,

"host" : "mongo02-jp:27027",

"arbiterOnly" : false,

"buildIndexes" : true,

"hidden" : false,

"priority" : 1,

"tags" : {

},

"slaveDelay" : NumberLong(0),

"votes" : 1

},

{

"_id" : 2,

"host" : "mongo03-jp:27027",

"arbiterOnly" : true,

"buildIndexes" : true,

"hidden" : false,

"priority" : 1,

"tags" : {

},

"slaveDelay" : NumberLong(0),

"votes" : 1

}

],

"settings" : {

"chainingAllowed" : true,

"heartbeatIntervalMillis" : 2000,

"heartbeatTimeoutSecs" : 10,

"electionTimeoutMillis" : 10000,

"catchUpTimeoutMillis" : 2000,

"getLastErrorModes" : {

},

"getLastErrorDefaults" : {

"w" : 1,

"wtimeout" : 0

},

"replicaSetId" : ObjectId("5850deb0205cd94104cd9a38")

}

}

shard1:PRIMARY> conf.members[0].priority=100

100

shard1:PRIMARY> conf.members[1].priority=90

90

shard1:PRIMARY> rs.reconfig(conf)

{ "ok" : 1 }

shard1:PRIMARY> rs.conf()

{

"_id" : "shard1",

"version" : 4,

"protocolVersion" : NumberLong(1),

"members" : [

{

"_id" : 0,

"host" : "mongo01-jp:27027",

"arbiterOnly" : false,

"buildIndexes" : true,

"hidden" : false,

"priority" : 100,

"tags" : {

},

"slaveDelay" : NumberLong(0),

"votes" : 1

},

{

"_id" : 1,

"host" : "mongo02-jp:27027",

"arbiterOnly" : false,

"buildIndexes" : true,

"hidden" : false,

"priority" : 90,

"tags" : {

},

"slaveDelay" : NumberLong(0),

"votes" : 1

},

{

"_id" : 2,

"host" : "mongo03-jp:27027",

"arbiterOnly" : true,

"buildIndexes" : true,

"hidden" : false,

"priority" : 1,

"tags" : {

},

"slaveDelay" : NumberLong(0),

"votes" : 1

}

],

"settings" : {

"chainingAllowed" : true,

"heartbeatIntervalMillis" : 2000,

"heartbeatTimeoutSecs" : 10,

"electionTimeoutMillis" : 10000,

"catchUpTimeoutMillis" : 2000,

"getLastErrorModes" : {

},

"getLastErrorDefaults" : {

"w" : 1,

"wtimeout" : 0

},

"replicaSetId" : ObjectId("5850deb0205cd94104cd9a38")

}

}

shard1:PRIMARY>

关于优先级范围从0 至 1000 (3.2以上版本) ，优先级越大，越可能成为primary；若优先级为0，则该节点无资格参与primary的选举。

如果希望某节点不参与primary的选举有两种方法： 1、将该节点优先级设置为0；2、rs.freeze(30) 在cluster选举primary时，将该节点暂时冻结30S。

如果希望将本primary节点降为secondary状态，可以执行 rs.stepDown() 。

二、在副本集中删除成员、重新添加成员

shard2:PRIMARY> rs.status()

{

"set" : "shard2",

"date" : ISODate("2016-12-14T06:12:11.986Z"),

"myState" : 1,

"term" : NumberLong(1),

"heartbeatIntervalMillis" : NumberLong(2000),

"optimes" : {

"lastCommittedOpTime" : {

"ts" : Timestamp(1481695926, 1),

"t" : NumberLong(1)

},

"appliedOpTime" : {

"ts" : Timestamp(1481695926, 1),

"t" : NumberLong(1)

},

"durableOpTime" : {

"ts" : Timestamp(1481695926, 1),

"t" : NumberLong(1)

}

},

"members" : [

{

"_id" : 0,

"name" : "mongo02-jp:27028",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 1128,

"optime" : {

"ts" : Timestamp(1481695926, 1),

"t" : NumberLong(1)

},

"optimeDate" : ISODate("2016-12-14T06:12:06Z"),

"electionTime" : Timestamp(1481695445, 2),

"electionDate" : ISODate("2016-12-14T06:04:05Z"),

"configVersion" : 4,

"self" : true

},

{

"_id" : 1,

"name" : "mongo01-jp:27028",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 464,

"optime" : {

"ts" : Timestamp(1481695926, 1),

"t" : NumberLong(1)

},

"optimeDurable" : {

"ts" : Timestamp(1481695926, 1),

"t" : NumberLong(1)

},

"optimeDate" : ISODate("2016-12-14T06:12:06Z"),

"optimeDurableDate" : ISODate("2016-12-14T06:12:06Z"),

"lastHeartbeat" : ISODate("2016-12-14T06:12:10.206Z"),

"lastHeartbeatRecv" : ISODate("2016-12-14T06:12:11.202Z"),

"pingMs" : NumberLong(0),

"syncingTo" : "mongo02-jp:27028",

"configVersion" : 4

},

{

"_id" : 2,

"name" : "mongo03-jp:27028",

"health" : 1,

"state" : 7,

"stateStr" : "ARBITER",

"uptime" : 439,

"lastHeartbeat" : ISODate("2016-12-14T06:12:10.205Z"),

"lastHeartbeatRecv" : ISODate("2016-12-14T06:12:10.125Z"),

"pingMs" : NumberLong(0),

"configVersion" : 4

}

],

"ok" : 1

}

shard2:PRIMARY> rs.remove("mongo01-jp:27028")

{ "ok" : 1 }

shard2:PRIMARY> rs.remove("mongo03-jp:27028")

{ "ok" : 1 }

shard2:PRIMARY> rs.status()

{

"set" : "shard2",

"date" : ISODate("2016-12-14T06:13:18.227Z"),

"myState" : 1,

"term" : NumberLong(1),

"heartbeatIntervalMillis" : NumberLong(2000),

"optimes" : {

"lastCommittedOpTime" : {

"ts" : Timestamp(1481695994, 1),

"t" : NumberLong(1)

},

"appliedOpTime" : {

"ts" : Timestamp(1481695994, 1),

"t" : NumberLong(1)

},

"durableOpTime" : {

"ts" : Timestamp(1481695994, 1),

"t" : NumberLong(1)

}

},

"members" : [

{

"_id" : 0,

"name" : "mongo02-jp:27028",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 1195,

"optime" : {

"ts" : Timestamp(1481695994, 1),

"t" : NumberLong(1)

},

"optimeDate" : ISODate("2016-12-14T06:13:14Z"),

"electionTime" : Timestamp(1481695445, 2),

"electionDate" : ISODate("2016-12-14T06:04:05Z"),

"configVersion" : 6,

"self" : true

}

],

"ok" : 1

}

shard2:PRIMARY> rs.add("mongo03-jp:27028")

{ "ok" : 1 }

shard2:PRIMARY> rs.addArb("mongo01-jp:27028")

{ "ok" : 1 }

shard2:PRIMARY> rs.status()

{

"set" : "shard2",

"date" : ISODate("2016-12-14T06:39:40.718Z"),

"myState" : 1,

"term" : NumberLong(1),

"heartbeatIntervalMillis" : NumberLong(2000),

"optimes" : {

"lastCommittedOpTime" : {

"ts" : Timestamp(1481697576, 1),

"t" : NumberLong(1)

},

"appliedOpTime" : {

"ts" : Timestamp(1481697576, 1),

"t" : NumberLong(1)

},

"durableOpTime" : {

"ts" : Timestamp(1481697576, 1),

"t" : NumberLong(1)

}

},

"members" : [

{

"_id" : 0,

"name" : "mongo02-jp:27028",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 2777,

"optime" : {

"ts" : Timestamp(1481697576, 1),

"t" : NumberLong(1)

},

"optimeDate" : ISODate("2016-12-14T06:39:36Z"),

"electionTime" : Timestamp(1481695445, 2),

"electionDate" : ISODate("2016-12-14T06:04:05Z"),

"configVersion" : 9,

"self" : true

},

{

"_id" : 1,

"name" : "mongo03-jp:27028",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 1034,

"optime" : {

"ts" : Timestamp(1481697576, 1),

"t" : NumberLong(1)

},

"optimeDurable" : {

"ts" : Timestamp(1481697576, 1),

"t" : NumberLong(1)

},

"optimeDate" : ISODate("2016-12-14T06:39:36Z"),

"optimeDurableDate" : ISODate("2016-12-14T06:39:36Z"),

"lastHeartbeat" : ISODate("2016-12-14T06:39:38.838Z"),

"lastHeartbeatRecv" : ISODate("2016-12-14T06:39:39.594Z"),

"pingMs" : NumberLong(0),

"syncingTo" : "mongo02-jp:27028",

"configVersion" : 9

},

{

"_id" : 2,

"name" : "mongo01-jp:27028",

"health" : 1,

"state" : 7,

"stateStr" : "ARBITER",

"uptime" : 1128,

"lastHeartbeat" : ISODate("2016-12-14T06:39:39.053Z"),

"lastHeartbeatRecv" : ISODate("2016-12-14T06:39:36.708Z"),

"pingMs" : NumberLong(0),

"configVersion" : 9

}

],

"ok" : 1

}