MongoDB基础之九 replication复制集

准备工作:创建目录

 mkdir -p /home/m17 //home/m18 /home/m19 /home/mlog

1:启动3个实例,且声明实例属于某复制集

 # ./bin/mongod --dbpath /home/m17 --logpath /home/mlog/m17.log --fork --port  --replSet rs2 --smallfiles
 # ./bin/mongod --dbpath /home/m18 --logpath /home/mlog/m18.log --fork --port  --replSet rs2 --smallfiles
 # ./bin/mongod --dbpath /home/m19 --logpath /home/mlog/m19.log --fork --port  --replSet rs2 --smallfiles

注:--smallfiles 最小文件创建实例

2:配置复制级

 var rsconf = {
 _id:'rs2',
 members:
 [
 {_id:,
 host:'127.0.0.1:27017'
 },
 {_id:,
 host:'127.0.0.1:27018'
 },
 {_id:,
 host:'127.0.0.1:27019'
 } 

 ]
 }

 > printjson(rsconf)
 {
 "_id" : "rs2",
 "members" : [
 {
 "_id" : ,
 "host" : "127.0.0.1:27017"
 },
 {
 "_id" : ,
 "host" : "127.0.0.1:27018"
 },
 {
 "_id" : ,
 "host" : "127.0.0.1:27019"
 }
 ]
 }

3: 根据配置做初始化

 > rs.initiate(rsconf)
 ;
 {
 "info" : "Config now saved locally. Should come online in about a minute.",
 "ok" :
 }
 rs2:SECONDARY> rs.status();
 {
 "set" : "rs2",
 "date" : ISODate("2016-05-26T00:43:57Z"),
 "myState" : ,
 "members" : [
 {
 "_id" : ,
 "name" : "127.0.0.1:27017",
 "health" : ,
 "state" : ,
 "stateStr" : "SECONDARY",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:43:11Z"),
 "self" : true
 },
 {
 "_id" : ,
 "name" : "127.0.0.1:27018",
 "health" : ,
 "state" : ,
 "stateStr" : "STARTUP2",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("1970-01-01T00:00:00Z"),
 "lastHeartbeat" : ISODate("2016-05-26T00:43:54Z"),
 "lastHeartbeatRecv" : ISODate("2016-05-26T00:43:52Z"),
 "pingMs" :
 },
 {
 "_id" : ,
 "name" : "127.0.0.1:27019",
 "health" : ,
 "state" : ,
 "stateStr" : "STARTUP2",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("1970-01-01T00:00:00Z"),
 "lastHeartbeat" : ISODate("2016-05-26T00:43:44Z"),
 "lastHeartbeatRecv" : ISODate("2016-05-26T00:43:53Z"),
 "pingMs" :
 }
 ],
 "ok" :
 }

4: 添加节点

 rs2:PRIMARY> rs.add('127.0.0.1:27018')
 { "down" : [ "127.0.0.1:27018" ], "ok" :  }
 rs2:PRIMARY> rs.status
 function () { return db._adminCommand("replSetGetStatus"); }
 rs2:PRIMARY> rs.status()
 {
 "set" : "rs2",
 "date" : ISODate("2016-05-26T00:51:01Z"),
 "myState" : ,
 "members" : [
 {
 "_id" : ,
 "name" : "127.0.0.1:27017",
 "health" : ,
 "state" : ,
 "stateStr" : "PRIMARY",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:50:53Z"),
 "self" : true
 },
 {
 "_id" : ,
 "name" : "127.0.0.1:27019",
 "health" : ,
 "state" : ,
 "stateStr" : "SECONDARY",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:50:53Z"),
 "lastHeartbeat" : ISODate("2016-05-26T00:51:00Z"),
 "lastHeartbeatRecv" : ISODate("2016-05-26T00:50:59Z"),
 "pingMs" : ,
 "lastHeartbeatMessage" : "syncing to: 127.0.0.1:27017",
 "syncingTo" : "127.0.0.1:27017"
 },
 {
 "_id" : ,
 "name" : "127.0.0.1:27018",
 "health" : ,
 "state" : ,
 "stateStr" : "SECONDARY",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:50:53Z"),
 "lastHeartbeat" : ISODate("2016-05-26T00:50:59Z"),
 "lastHeartbeatRecv" : ISODate("2016-05-26T00:51:00Z"),
 "pingMs" : ,
 "lastHeartbeatMessage" : "syncing to: 127.0.0.1:27017",
 "syncingTo" : "127.0.0.1:27017"
 }
 ],
 "ok" :
 }

5:查看状态

 rs.status();

6:删除节点

 rs2:PRIMARY> rs.remove('127.0.0.1:27018');
 Thu May  ::36.621 DBClientCursor::init call() failed
 Thu May  ::36.621 Error: error doing query: failed at src/mongo/shell/query.js:
 Thu May  ::36.622 trying reconnect to 127.0.0.1:
 Thu May  ::36.622 reconnect 127.0.0.1: ok
 rs2:PRIMARY> rs.status();
 {
 "set" : "rs2",
 "date" : ISODate("2016-05-26T00:49:38Z"),
 "myState" : ,
 "members" : [
 {
 "_id" : ,
 "name" : "127.0.0.1:27017",
 "health" : ,
 "state" : ,
 "stateStr" : "PRIMARY",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:49:36Z"),
 "self" : true
 },
 {
 "_id" : ,
 "name" : "127.0.0.1:27019",
 "health" : ,
 "state" : ,
 "stateStr" : "SECONDARY",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:49:36Z"),
 "lastHeartbeat" : ISODate("2016-05-26T00:49:38Z"),
 "lastHeartbeatRecv" : ISODate("2016-05-26T00:49:37Z"),
 "pingMs" : ,
 "lastHeartbeatMessage" : "syncing to: 127.0.0.1:27017",
 "syncingTo" : "127.0.0.1:27017"
 }
 ],
 "ok" :
 }

7:主节点插入数据

 rs2:PRIMARY> show dbs
 local .029296875GB
 rs2:PRIMARY>
 rs2:PRIMARY>
 rs2:PRIMARY> use test
 switched to db test
 rs2:PRIMARY>
 rs2:PRIMARY> db.stu.insert({title:'hello'});
 rs2:PRIMARY>
 rs2:PRIMARY>
 rs2:PRIMARY> show tables;
 stu
 system.indexes

8:连接secondary查询同步情况

 # ./bin/mongo -port
 MongoDB shell version: 2.4.
 connecting to: 127.0.0.1:/test
 rs2:SECONDARY> use test
 switched to db test
 rs2:SECONDARY> show tables
 Thu May  ::57.272 error: { "$err" : "not master and slaveOk=false", "code" :  } at src/mongo/shell/query.js:

8.1 出现上述错误,是因为slave默认不许读写

 rs2:SECONDARY> rs.slaveOk();
 rs2:SECONDARY> show tables
 stu
 system.indexes
 rs2:SECONDARY> db.stu.find();
 { "_id" : ObjectId("57464a73c79dad862e06cd3b"), "title" : "hello" }

#看到与primary 一致的数据

 9 主节点down机器 ,primary节点自动漂移

 rs2:PRIMARY> use admin
 switched to db admin
 rs2:PRIMARY> db.shutdownServer();
 Thu May  ::33.316 DBClientCursor::init call() failed

 rs2:SECONDARY> rs.status()
 {
 "set" : "rs2",
 "date" : ISODate("2016-05-26T01:19:38Z"),
 "myState" : ,
 "syncingTo" : "127.0.0.1:27018",
 "members" : [
 {
 "_id" : ,
 "name" : "127.0.0.1:27017",
 "health" : ,
 "state" : ,
 "stateStr" : "(not reachable/healthy)",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:59:32Z"),
 "lastHeartbeat" : ISODate("2016-05-26T01:19:38Z"),
 "lastHeartbeatRecv" : ISODate("2016-05-26T01:19:33Z"),
 "pingMs" :
 },
 {
 "_id" : ,
 "name" : "127.0.0.1:27019",
 "health" : ,
 "state" : ,
 "stateStr" : "SECONDARY",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:59:32Z"),
 "errmsg" : "syncing to: 127.0.0.1:27018",
 "self" : true
 },
 {
 "_id" : ,
 "name" : "127.0.0.1:27018",
 "health" : ,
 "state" : ,
 "stateStr" : "PRIMARY",
 "uptime" : ,
 "optime" : Timestamp(, ),
 "optimeDate" : ISODate("2016-05-26T00:59:32Z"),
 "lastHeartbeat" : ISODate("2016-05-26T01:19:38Z"),
 "lastHeartbeatRecv" : ISODate("2016-05-26T01:19:36Z"),
 "pingMs" : ,
 "syncingTo" : "127.0.0.1:27017"
 }
 ],
 "ok" :
 }