mongodb replica set 添加/刪除節點方法

replica set多伺服器主從，添加，刪除節點，肯定會經常遇到的。下面詳細說明一下，添加，刪除節點的2種方法。

一，利用rs.reconfig，來添加，刪除節點

1，添加節點

代碼如下	複製代碼
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}]};   //添加節點 repmore:PRIMARY> rs.reconfig(config);   //使配置生效 repmore:PRIMARY> rs.status();     //查看節點狀態

節點添加成功。

注意：新增節點的replSet要和其他節點要一樣

2,刪除節點(刪除節點前最好是先關閉需要刪除的節點，之後通過命令 rs.remove 來刪除)

代碼如下	複製代碼
repmore:PRIMARY> config = {_id:"repmore",members:[{_id:0,host:'127.0.0.1:27017',priority :2}]};     //刪除節點 repmore:PRIMARY> rs.reconfig(config);   //使配置生效 repmore:PRIMARY> rs.status();   //查看節點狀態

二，利用rs.add和rs.remove來添加刪除節點

代碼如下	複製代碼
repmore:PRIMARY> rs.add("127.0.0.1:27018");     //添加節點 repmore:PRIMARY> rs.remove("127.0.0.1:27018");  //刪除節

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

最後對於刪除節點我這裡再附一個標準流程給各位

相應的節點，操作如下：
  

代碼如下

複製代碼

--1 查看當前 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"                 }         ] }       備忘：計劃刪除節點 "_id" : 3。 --2 關閉 27021 節點服務  [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 狀態  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 }   備忘：最後一個節點 stateStr 狀態為 “not reachable/healthy”。   --4 刪除節點  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"                 }         ] }

   
  備忘：節點 "redhatB.example.com:27021" 已刪除。

 --6 刪除舊結點資料目錄

代碼如下	複製代碼
[mongo@redhatB mongodb]$ rm -rf  /mongodb/data04