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MongoDB Replica Sets不仅提供高可用性的解决方案，同时也提供负载均衡的解决方案，增减 Replica Sets节点在实际应用中非常普通。例如，当应用的读压力暴增时，3台节点的环境已不能满足需求，那么就需要增加一些节点将压力平均分配一下；当应用的压力小时，可以减少一些节点来减少硬件资源的成本，总之这是一个长期且持续的工作。
增加节点步骤
1） 配置并启动新节点，启用 28013 这个端口给新的节点
[root@node222 mongodb]# mkdir -p /data02/mongors/data/r3
[root@node222 mongodb]# echo " this is rs1 super secret key " > /data02/mongors/key/r3
[root@node222 mongodb]# chmod 600 /data02/mongors/key/r3
[root@node222 mongodb]# /usr/local/mongodb/bin/mongod --replSet rs1 --keyFile /data02/mongors/key/r3 --fork --port 28013 --dbpath /data02/mongors/data/r3 --logpath=/data02/mongors/log/r3.log --logappend
about to fork child process, waiting until server is ready for connections.
forked process: 17718
child process started successfully, parent exiting
[root@node222 mongodb]#
2) 在primary节点上执行命令添加此新节点到现有的 Replica Sets
rs1:PRIMARY> rs.add("localhost:28013");rs.add("localhost:28013");
{ "ok" : 1 }
rs1:PRIMARY> rs.status();rs.status();
{
"set" : "rs1",
"date" : ISODate("2016-07-22T10:26:06.175Z"),
"myState" : 1,
"term" : NumberLong(2),
"heartbeatIntervalMillis" : NumberLong(2000),
"members" : [
{
"_id" : 0,
"name" : "localhost:28010",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 235,
"optime" : {
"ts" : Timestamp(1469183031, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2016-07-22T10:23:51Z"),
"lastHeartbeat" : ISODate("2016-07-22T10:26:05.493Z"),
"lastHeartbeatRecv" : ISODate("2016-07-22T10:26:05.603Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "localhost:28012",
"configVersion" : 2
},
{
"_id" : 1,
"name" : "localhost:28011",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 2749,
"optime" : {
"ts" : Timestamp(1469183031, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2016-07-22T10:23:51Z"),
"lastHeartbeat" : ISODate("2016-07-22T10:26:05.493Z"),
"lastHeartbeatRecv" : ISODate("2016-07-22T10:26:05.603Z"),
"pingMs" : NumberLong(0),
"syncingTo" : "localhost:28012",
"configVersion" : 2
},
{
"_id" : 2,
"name" : "localhost:28012",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 2956,
"optime" : {
"ts" : Timestamp(1469183031, 1),
"t" : NumberLong(2)
},
"optimeDate" : ISODate("2016-07-22T10:23:51Z"),
"electionTime" : Timestamp(1469182400, 1),
"electionDate" : ISODate("2016-07-22T10:13:20Z"),
"configVersion" : 2,
"self" : true
},
{
"_id" : 3,
"name" : "localhost:28013",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 65,
"optime" : {
"ts" : Timestamp(1469177570, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2016-07-22T08:52:50Z"),
"lastHeartbeat" : ISODate("2016-07-22T08:53:54.701Z"),
"lastHeartbeatRecv" : ISODate("2016-07-22T08:53:51.755Z"),
"pingMs" : NumberLong(0),
"configVersion" : 2
}
],
"ok" : 1
}
rs1:PRIMARY> rs.config();rs.config();
{
"_id" : "rs1",
"version" : 2,
"protocolVersion" : NumberLong(1),
"members" : [
{
"_id" : 0,
"host" : "localhost:28010",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 1,
"host" : "localhost:28011",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "localhost:28012",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 3,
"host" : "localhost:28013",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("5791ea00a9dbf7228bb1ec0c")
}
}
rs1:PRIMARY>
3）验证数据是否已经同步过来了
# /usr/local/mongodb/bin/mongo -port 28013
> rs.slaveOK()
> db.c1.find()
删除节点步骤
下面将刚刚添加的两个新节点 28013 从复制集中去除掉，只需 rs.remove 指令就可以了，具体如下：
登录到primary 节点，执行下面的命令将28013 从复制集中去掉：
> rs.remove("localhsots:28013");
查看复制集状态，可以看到只有三个成员，原来的两个成员都已经成功去除了：
> rs.status()
rs1:PRIMARY> rs.remove("localhost:28013");rs.remove("localhost:28013");
{ "ok" : 1 }
rs1:PRIMARY> rs.conf() rs.conf()
{
"_id" : "rs1",
"version" : 3,
"protocolVersion" : NumberLong(1),
"members" : [
{
"_id" : 0,
"host" : "localhost:28010",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 1,
"host" : "localhost:28011",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
},
{
"_id" : 2,
"host" : "localhost:28012",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : NumberLong(0),
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatIntervalMillis" : 2000,
"heartbeatTimeoutSecs" : 10,
"electionTimeoutMillis" : 10000,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
},
"replicaSetId" : ObjectId("5791d785947160a5bdbd700b")
}
}
rs1:PRIMARY>
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原文地址：http://www.cnblogs.com/iamqiu/p/5699674.html
