mongodb replica set 添加/删除节点方法--http://www.ii123.com/jc/bc/bczh/258948.html

replica set多服务器主从，添加，删除节点，肯定会经常遇到的。下面详细说明一下，添加，删除节点的2种方法。

　　一，利用rs.reconfig，来添加，删除节点

　　1，添加节点

代码如下
repmore:PRIMARY> config = {_id:"repmore",members:[{_id:0,host:'127.0.0.1:27017',priority :2},{_id:1,host:'127.0.0.1:27018',priority:1}]};   //添加节点 repmore:PRIMARY> rs.reconfig(config);   //使配置生效 repmore:PRIMARY> rs.status();     //查看节点状态

　　节点添加成功。

　　注意：新增节点的replSet要和其他节点要一样

　　2,删除节点(删除节点前最好是先关闭需要删除的节点，之后通过命令 rs.remove 来删除)

代码如下
repmore:PRIMARY> config = {_id:"repmore",members:[{_id:0,host:'127.0.0.1:27017',priority :2}]};     //删除节点 repmore:PRIMARY> rs.reconfig(config);   //使配置生效 repmore:PRIMARY> rs.status();   //查看节点状态

　　二，利用rs.add和rs.remove来添加删除节点

代码如下
repmore:PRIMARY> rs.add("127.0.0.1:27018");     //添加节点 repmore:PRIMARY> rs.remove("127.0.0.1:27018");  //删除节

　　注意：利用rs.add和rs.remove是不用rs.reconfig来使用配置生效的。

　　最后对于删除节点我这里再附一个标准流程给各位

　　相应的节点，操作如下：

代码如下

--1 查看当前 Replica Set 配置 [mongo@redhatB mongodb]$ mongo 127.0.0.1:27018 MongoDB shell version: 2.2.1 connecting to: 127.0.0.1:27018/test rs0:PRIMARY> rs.conf(); {         "_id" : "rs0",         "version" : 4,         "members" : [                 {                         "_id" : 0,                         "host" : "redhatB.example.com:27018"                 },                 {                         "_id" : 1,                         "host" : "redhatB.example.com:27019"                 },                 {                         "_id" : 2,                         "host" : "redhatB.example.com:27020"                 },                 {                         "_id" : 3,                         "host" : "redhatB.example.com:27021"                 }         ] } 备注：计划删除节点 "_id" : 3。 --2 关闭 27021 节点服务 [mongo@redhatB data04]$ ps -ef | grep 27021 mongo    11733     1  0 21:03 ?        00:00:15 mongod -f /pgdata_xc/mongodb/data04/mongodb_27021.conf mongo    14422  2953  0 21:53 pts/0    00:00:00 mongo 127.0.0.1:27021 mongo    14490  4027  0 21:54 pts/1    00:00:00 grep 27021 [mongo@redhatB data04]$ kill 11733 --3 查看 replica set 状态 rs0:PRIMARY> rs.status(); {         "set" : "rs0",         "date" : ISODate("2012-11-22T13:57:15Z"),         "myState" : 1,         "members" : [                 {                         "_id" : 0,                         "name" : "redhatB.example.com:27018",                         "health" : 1,                         "state" : 1,                         "stateStr" : "PRIMARY",                         "uptime" : 21279,                         "optime" : Timestamp(1353589624000, 1),                         "optimeDate" : ISODate("2012-11-22T13:07:04Z"),                         "self" : true                 },                 {                         "_id" : 1,                         "name" : "redhatB.example.com:27019",                         "health" : 1,                         "state" : 2,                         "stateStr" : "SECONDARY",                         "uptime" : 18908,                         "optime" : Timestamp(1353589624000, 1),                         "optimeDate" : ISODate("2012-11-22T13:07:04Z"),                         "lastHeartbeat" : ISODate("2012-11-22T13:57:13Z"),                         "pingMs" : 0                 },                 {                         "_id" : 2,                         "name" : "redhatB.example.com:27020",                         "health" : 1,                         "state" : 2,                         "stateStr" : "SECONDARY",                         "uptime" : 18900,                         "optime" : Timestamp(1353589624000, 1),                         "optimeDate" : ISODate("2012-11-22T13:07:04Z"),                         "lastHeartbeat" : ISODate("2012-11-22T13:57:14Z"),                         "pingMs" : 0                 },                 {                         "_id" : 3,                         "name" : "redhatB.example.com:27021",                         "health" : 0,                         "state" : 8,                         "stateStr" : "(not reachable/healthy)",                         "uptime" : 0,                         "optime" : Timestamp(1353589624000, 1),                         "optimeDate" : ISODate("2012-11-22T13:07:04Z"),                         "lastHeartbeat" : ISODate("2012-11-22T13:55:20Z"),                         "pingMs" : 0,                         "errmsg" : "socket exception [CONNECT_ERROR] for redhatB.example.com:27021"                 }         ],         "ok" : 1 } 备注：最后一个节点 stateStr 状态为 “not reachable/healthy”。   --4 删除节点 rs0:PRIMARY> rs.remove("redhatB.example.com:27021"); Thu Nov 22 21:58:45 DBClientCursor::init call() failed Thu Nov 22 21:58:45 query failed : admin.$cmd { replSetReconfig: { _id: "rs0", version: 5, members: [ { _id: 0, host: "redhatB.example.com:27018" }, { _id: 1, host: "redhatB.example.com:27019" }, { _id: 2, host: "redhatB.example.com:27020" } ] } } to: 127.0.0.1:27018 Thu Nov 22 21:58:45 Error: error doing query: failed src/mongo/shell/collection.js:155 Thu Nov 22 21:58:45 trying reconnect to 127.0.0.1:27018 Thu Nov 22 21:58:45 reconnect 127.0.0.1:27018 ok rs0:SECONDARY> rs0:PRIMARY> --5 再次查看 replica set 配置 rs0:PRIMARY> rs.conf(); {         "_id" : "rs0",         "version" : 5,         "members" : [                 {                         "_id" : 0,                         "host" : "redhatB.example.com:27018"                 },                 {                         "_id" : 1,                         "host" : "redhatB.example.com:27019"                 },                 {                         "_id" : 2,                         "host" : "redhatB.example.com:27020"                 }         ] }

　　备注：节点 "redhatB.example.com:27021" 已删除。

　　--6 删除旧结点数据目录

代码如下
[mongo@redhatB mongodb]$ rm -rf  /mongodb/data04