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
}