MongoDB 新增Replica Set例項
阿新 • • 發佈:2019-01-24
1. 原副本集(單節點):
# mongo 127.0.0.1:22001
use admin
config = { _id:"shard1", members:[
{_id:0,host:"10.101.1.140:22001"}
]
}
rs.initiate(config);
2. 新增副本節點:
登入主節點:
# mongo 10.101.1.140:22001
shard1:PRIMARY> rs.conf()
{
"_id" : "shard1",
"version" : 1,
"members" : [
{
"_id" : 0,
"host" : "10.101.1.140:22001"
}
]
}
shard1:PRIMARY> rs.add("10.101.1.140:22011");
{ "ok" : 1 }
shard1:PRIMARY> rs.conf();
{
"_id" : "shard1",
"version" : 2,
"members" : [
{
"_id" : 0,
"host" : "10.101.1.140:22001"
},
{
"_id" : 1,
"host" : "10.101.1.140:22011"
}
]
}
shard1:PRIMARY> rs.status();
{
"set" : "shard1",
"date" : ISODate("2015-08-14T07:53:13Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "10.101.1.140:22001",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 856639,
"optime" : Timestamp(1439538734, 1),
"optimeDate" : ISODate("2015-08-14T07:52:14Z"),
"electionTime" : Timestamp(1438736839, 2),
"electionDate" : ISODate("2015-08-05T01:07:19Z"),
"self" : true
},
{
"_id" : 1,
"name" : "10.101.1.140:22011",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 59,
"optime" : Timestamp(1439538734, 1),
"optimeDate" : ISODate("2015-08-14T07:52:14Z"),
"lastHeartbeat" : ISODate("2015-08-14T07:53:12Z"),
"lastHeartbeatRecv" : ISODate("2015-08-14T07:53:11Z"),
"pingMs" : 0,
"syncingTo" : "10.101.1.147:22001"
}
],
"ok" : 1
}
STARTUP2
檢視同步狀態
shard1:PRIMARY> db.printSlaveReplicationInfo()source: 10.101.1.140:22011
syncedTo: Fri Aug 14 2015 15:52:14 GMT+0800 (CST)
0 secs (0 hrs) behind the primary
登入從節點:
# mongo 10.101.1.140:22011
shard1:SECONDARY> show tables;
2015-08-14T16:00:00.650+0800 error: { "$err" : "not master and slaveOk=false", "code" : 13435 }
此時從節點不可讀寫,使用 rs.slaveOk() 命令開啟只讀。
shard1:SECONDARY> rs.slaveOk();
shard1:SECONDARY> show tables;
檢視是否主節點:
rs.isMaster()
主從切換
這裡複製集有主備兩個節點,手動停止主節點,備節點並沒有(不會)自動成為主節點。
注意到,當主節點宕機,分片的複製集中需要有一個仲裁節點,才會自動將備節點選為主節點。
啟動一個mongo備份節點,作為仲裁節點加入複製集:rs.addArb("host:port"),然後停止主節點,備節點自動成為主節點了。
(官方說明:如果你有偶數個投票成員,那麼部署一個仲裁節點,使投票節點數變成奇數。)
移除節點:rs.remove("host:port")
停止/啟用Balancer
db.printShardingStatus()
sh.isBalancerRunning()
sh.startBalancer();