MongoDB 副本集搭建
Posted Hank.Yoon
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搭建mongodb副本集
[root@ mongodb]# cd /u02 [root@ u02]# mkdir -p mongodb/data_2777 [root@ u02]# mkdir -p mongodb/data_3777 [root@ u02]# mkdir -p mongodb/data_4777 [root@ mongodb]# tar mongodb-linux-x86_64-3.2.6.tgz [root@ mongodb]# mv mongodb-linux-x86_64-3.2.6 mongodb [root@ mongodb]# mkdir -p 2777 3777 4777 [root@ 2777]# mkdir {conf,log,keys,pid} [root@ 3777]# mkdir {conf,log,keys,pid} [root@ 4777]# mkdir {conf,log,keys,pid}
创建配置文件
[root@ conf]# vi mongodb_2777.conf
systemLog: destination: file logAppend: true path: /u02/mongodb/mongodb/2777/log/shard1.log storage: dbPath: /u02/mongodb/data_2777 journal: enabled: true directoryPerDB: true engine: wiredTiger wiredTiger: engineConfig: cacheSizeGB: 10 # the maximum of half of physical RAM or 1 gigabyte directoryForIndexes: true # mongod stores indexes and collections in separate subdirectories under the data (i.e. storage.dbPath) directory collectionConfig: blockCompressor: snappy # The default type of compression to use to compress collection data processManagement: fork: true # fork and run in background pidFilePath: /u02/mongodb/mongodb/2777/pid/mongodb_2777.pid # location of pidfile net: bindIp: 0.0.0.0 port: 2777 operationProfiling: slowOpThresholdMs: 500 mode: slowOp replication: replSetName: shard1 #副本集的名称，副本集以此名称来识别是否属于同一个集群中 oplogSizeMB: 512 #auditLog: # destination: file # format: JSON # path: /u02/mongodb/mongodb/2777/log/audit_log/audit.json #
启动mongodb
/u02/mongodb/mongodb/bin/mongod -f /u02/mongodb/mongodb/2777/conf/mongodb_2777.conf /u02/mongodb/mongodb/bin/mongod -f /u02/mongodb/mongodb/3777/conf/mongodb_3777.conf /u02/mongodb/mongodb/bin/mongod -f /u02/mongodb/mongodb/4777/conf/mongodb_4777.conf
登录2777端口mongodb
[root@ conf]# /u02/mongodb/mongodb/bin/mongo --port 2777 MongoDB shell version: 3.2.6 connecting to: 127.0.0.1:2777/test Server has startup warnings: 2019-10-08T19:47:35.621+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 2019-10-08T19:47:35.621+0800 I CONTROL [initandlisten] 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** WARNING: You are running on a NUMA machine. 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** We suggest launching mongod like this to avoid performance problems: 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** numactl --interleave=all mongod [other options] 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is ‘always‘. 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** We suggest setting it to ‘never‘ 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is ‘always‘. 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** We suggest setting it to ‘never‘ 2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] shard1:PRIMARY>
shard1:PRIMARY>conf = {_id:"shard1",members:[{_id:0,host:"127.0.0.1:2777"}]};
shard1:PRIMARY>rs.initiate(conf) ;
会显示出你的当前数据库服务实例已经加到副本集中，并且是master
shard1:PRIMARY> db.isMaster() { "hosts" : [ "127.0.0.1:2777", "127.0.0.1:3777", "127.0.0.1:4777" ], "setName" : "shard1", "setVersion" : 3, "ismaster" : true, "secondary" : false, "primary" : "127.0.0.1:2777", "me" : "127.0.0.1:2777", "electionId" : ObjectId("7fffffff0000000000000001"), "maxBsonObjectSize" : 16777216, "maxMessageSizeBytes" : 48000000, "maxWriteBatchSize" : 1000, "localTime" : ISODate("2019-10-08T12:12:35.869Z"), "maxWireVersion" : 4, "minWireVersion" : 0, "ok" : 1 }
接着添加刚刚那2个服务实例到副本集中
shard1:PRIMARY>rs.add("127.0.0.1:3777"); shard1:PRIMARY>rs.add("127.0.0.1:4777");
查看副本集：
shard1:PRIMARY> rs.status() { "set" : "shard1", "date" : ISODate("2019-10-08T12:14:04.786Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" : NumberLong(2000), "members" : [ { "_id" : 0, "name" : "127.0.0.1:2777", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 1589, "optime" : { "ts" : Timestamp(1570536146, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2019-10-08T12:02:26Z"), "electionTime" : Timestamp(1570536062, 2), "electionDate" : ISODate("2019-10-08T12:01:02Z"), "configVersion" : 3, "self" : true }, { "_id" : 1, "name" : "127.0.0.1:3777", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 706, "optime" : { "ts" : Timestamp(1570536146, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2019-10-08T12:02:26Z"), "lastHeartbeat" : ISODate("2019-10-08T12:14:04.654Z"), "lastHeartbeatRecv" : ISODate("2019-10-08T12:14:03.533Z"), "pingMs" : NumberLong(0), "syncingTo" : "127.0.0.1:2777", "configVersion" : 3 }, { "_id" : 2, "name" : "127.0.0.1:4777", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 698, "optime" : { "ts" : Timestamp(1570536146, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2019-10-08T12:02:26Z"), "lastHeartbeat" : ISODate("2019-10-08T12:14:04.654Z"), "lastHeartbeatRecv" : ISODate("2019-10-08T12:14:03.414Z"), "pingMs" : NumberLong(0), "configVersion" : 3 } ], "ok" : 1 }
rs.status()
"health" : 1, #代表机器正常
"stateStr" : "PRIMARY", #代表是主节点，可读写，其中有以下几下状态
1. STARTUP：刚加入到复制集中，配置还未加载
2. STARTUP2：配置已加载完，初始化；
3. RECOVERING：正在恢复，不适用读
4. ARBITER: 仲裁者
5. DOWN：节点不可到达
6. UNKNOWN：未获取其他节点状态而不知是什么状态，一般发生在只有两个成员的架构
7. REMOVED：移除复制集
8. ROLLBACK：数据回滚，在回滚结束时，转移到RECOVERING或SECONDARY状态
9. FATAL：出错。查看日志grep “replSet FATAL”找出错原因，重新做同步
10. PRIMARY：主节点
11. SECONDARY：备份节点
创建数据库：
shard1:PRIMARY> use yoon
查看当前数据库：
shard1:PRIMARY> db
yoon
插入数据：
shard1:PRIMARY> db.movie.insert({"name":"hank"});
WriteResult({ "nInserted" : 1 })
查看当前库下的表：
shard1:PRIMARY> show collections
movie
查看表中数据：
shard1:PRIMARY> db.movie.find() { "_id" : ObjectId("5d9c7ee9d7a8df8fd023d6ed"), "name" : "hank" }
登录3777端口查看表movie：
[root@ conf]# /u02/mongodb/mongodb/bin/mongo --port 3777 注意：新建的slave是不能读和写的，当在从服务器上读时会出现errmsg：not master and slaveOk=flase code：13435 错误，需要执行：rs.slaveOk()来开启读功能
shard1:SECONDARY> rs.slaveOk() shard1:SECONDARY> show dbs local 0.000GB yoon 0.000GB shard1:SECONDARY> use yoon switched to db yoon shard1:SECONDARY> show collections movie shard1:SECONDARY> db.movie.find() { "_id" : ObjectId("5d9c7ee9d7a8df8fd023d6ed"), "name" : "hank" }
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