MongoDB复制集之：安装部署



准备工作

软件环境OS：Oracle Linux 6.5MongoDB:mongodb3.2.3 部署架构模拟有三台服务器10.1.5.123:28001 主节点10.1.5.123:28002 从节点10.1.5.123:28003 选举节点 复制集架构：一主，一从，一选举节点 下载安装下载地址：https://www.mongodb.org/downloadsmongodb-linux-x86_64-rhel62-3.2.3.tgz

部署步骤

1.创建目录及用户

[root@devtest mongodb]# mkdir conf data log[root@devtest data]# mkdir 28001 28002 28003--创建mongo用户[root@devtest conf]# groupadd mongod[root@devtest conf]# useradd -g mongod mongod

2.创建配置文件

--配置三个实例的配置文件（修改相应的端口号即可）--节点1$ vi /home/mongod/mongodb3.2.3/conf/28001.confport=28001bind_ip=10.1.5.123logpath=/home/mongod/mongodb3.2.3/log/28001.logdbpath=/home/mongod/mongodb3.2.3/data/28001/logappend=truepidfilepath=/home/mongod/mongodb3.2.3/data/28001/28001.pidfork=trueoplogSize=1024replSet=MyMongo --节点2$ vi /home/mongod/mongodb3.2.3/conf/28002.confport=28002bind_ip=10.1.5.123logpath=/home/mongod/mongodb3.2.3/log/28002.logdbpath=/home/mongod/mongodb3.2.3/data/28002/logappend=truepidfilepath=/home/mongod/mongodb3.2.3/data/28002/28002.pidfork=trueoplogSize=1024replSet=MyMongo --节点3$ vi /home/mongod/mongodb3.2.3/conf/28003.confport=28003bind_ip=10.1.5.123logpath=/home/mongod/mongodb3.2.3/log/28003.logdbpath=/home/mongod/mongodb3.2.3/data/28003/logappend=truepidfilepath=/home/mongod/mongodb3.2.3/data/28003/28003.pidfork=trueoplogSize=1024replSet=MyMongo

3.启动mongo复制集

$ mongod -f /home/mongod/mongodb3.2.3/conf/28001.conf$ mongod -f /home/mongod/mongodb3.2.3/conf/28002.conf$ mongod -f /home/mongod/mongodb3.2.3/conf/28003.conf

4.初始化复制集

[mongod@devtest ~]$ mongo 10.1.5.123:28001/adminMongoDB shell version: 3.2.3connecting to: 10.1.5.123:28001/adminWelcome to the MongoDB shell.For interactive help, type"help".For more comprehensive documentation, see http://docs.mongodb.org/Questions? Try the support group http://groups.google.com/group/mongodb-user> dbadmin> config = {... "_id":"MyMongo",... members:[...{"_id":0,host:"10.1.5.123:28001"},...{"_id":1,host:"10.1.5.123:28002"},... {"_id":2,host:"10.1.5.123:28003"}]... }{ "id" : "MyMongo", "members" : [ { "_id" : 0, "host" :"10.1.5.123:28001" }, { "_id" : 1, "host" :"10.1.5.123:28002" }, { "_id" : 2, "host" :"10.1.5.123:28003" } ]} --查看复制集成员> config.members[ { "_id" : 0, "host" :"10.1.5.123:28001" }, { "_id" : 1, "host" :"10.1.5.123:28002" }, { "_id" : 2, "host" :"10.1.5.123:28003" }] --把节点3修改为arbiter选举节点> config.members[2]{ "_id" : 2, "host" :"10.1.5.123:28003" }> config.members[2] ={"_id":2,"host":"10.1.5.123:28003",arbiterOnly:true}{ "id" : 0, "host" :"10.1.5.123:28003", "arbiterOnly" : true } --进行复制集初始化> rs.initiate(config){ "ok" : 1 } --查看复制集状态MyMongo:OTHER> rs.status(){ "set" : "MyMongo", "date" :ISODate("2016-03-15T09:42:47.643Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" :NumberLong(2000), "members" : [ { "_id" : 0, "name" :"10.1.5.123:28001", "health" : 1, "state" : 1, "stateStr" :"PRIMARY", "uptime" :1812, "optime" : { "ts": Timestamp(1458034899, 1), "t" :NumberLong(1) }, "optimeDate": ISODate("2016-03-15T09:41:39Z"), "infoMessage": "could not find member to sync from", "electionTime" : Timestamp(1458034898, 1), "electionDate": ISODate("2016-03-15T09:41:38Z"), "configVersion" : 1, "self" : true }, { "_id" : 1, "name" :"10.1.5.123:28002", "health" : 1, "state" : 2, "stateStr" :"SECONDARY", "uptime" :80, "optime" : { "ts": Timestamp(1458034899, 1), "t" :NumberLong(1) }, "optimeDate": ISODate("2016-03-15T09:41:39Z"), "lastHeartbeat" :ISODate("2016-03-15T09:42:46.947Z"), "lastHeartbeatRecv" :ISODate("2016-03-15T09:42:46.445Z"), "pingMs" :NumberLong(0), "syncingTo" :"10.1.5.123:28001", "configVersion" : 1 }, { "_id" : 2, "name" :"10.1.5.123:28003", "health" : 1, "state" : 7, "stateStr" :"ARBITER", "uptime" :80, "lastHeartbeat" :ISODate("2016-03-15T09:42:46.946Z"), "lastHeartbeatRecv" :ISODate("2016-03-15T09:42:44.428Z"), "pingMs" :NumberLong(0), "configVersion": 1 } ], "ok" : 1}MyMongo:PRIMARY>

5. 验证复制集同步

分别登录两从节点查看登录状态，分别为secondary和arbite下面登录从secondary节点进行测试：在从节点进行查询时报下面的错误，因为在默认情况下，不通过驱动连接mongodb从节点数据库时，如果不开始slaveOK=true，是无法读取从节点数据的。[mongod@devtest conf]$ mongo10.1.5.123:28002/adminMongoDB shell version: 3.2.3connecting to:10.1.5.123:28002/adminMyMongo:SECONDARY> show dbs2016-03-15T17:49:47.854+0800 EQUERY [thread1] Error: listDatabasesfailed:{ "ok" : 0, "errmsg" : "not master andslaveOk=false", "code" : 13435 } :_getErrorWithCode@src/mongo/shell/utils.js:23:13Mongo.prototype.getDBs@src/mongo/shell/mongo.js:53:1shellHelper.show@src/mongo/shell/utils.js:700:19shellHelper@src/mongo/shell/utils.js:594:15@(shellhelp2):1:1MyMongo:SECONDARY>rs.slaveOk(true)MyMongo:SECONDARY> show dbslocal 0.000GBtest 0.000GBMyMongo:SECONDARY> use testswitched to db testMyMongo:SECONDARY> showtablest1MyMongo:SECONDARY>db.t1.find(){ "_id" :ObjectId("56e7dc310ebd75f9ef3546c1"), "name" :"licz" } 下面登录从arbite节点进行测试：然后登录arbite节点，会发现数据没有同步，因为arbite不参与数据库的同步，即不存储数据但local数据库大小已经改变了，因为local库存储命名空间（local.ns文件）的内容。 MyMongo:ARBITER> rs.slaveOk(true)MyMongo:ARBITER> show dbslocal 0.000GB

6.模拟主-从故障切换

--杀掉当前主节点为28001端口[mongod@devtest ~]$ ps -ef|grep mongoroot 7186 7150 0 09:15 pts/2 00:00:00 su - mongodmongod 7187 7186 0 09:15 pts/2 00:00:00 -bashmongod 7306 7187 0 09:16 pts/2 00:00:00 ps -efmongod 7307 7187 0 09:16 pts/2 00:00:00 grep mongomongod 16253 1 2 Mar15 ? 00:22:00 mongod -f/home/mongod/mongodb3.2.3/conf/28001.confmongod 16299 1 2 Mar15 ? 00:21:50 mongod -f/home/mongod/mongodb3.2.3/conf/28002.confmongod 16345 1 2 Mar15 ? 00:20:05 mongod -f/home/mongod/mongodb3.2.3/conf/28003.conf[mongod@devtest ~]$ kill -9 16253 --发现主节点已经切换至28002端口[mongod@devtest ~]$ mongo 10.1.5.123:28002/adminMongoDB shell version: 3.2.3connecting to: 10.1.5.123:28002/adminMyMongo:PRIMARY> --再次启动28001端口并登录，发现28001已为从节点[mongod@devtest ~]$ mongod -f /home/mongod/mongodb3.2.3/conf/28001.confabout to fork child process, waiting untilserver is ready for connections.forked process: 21410child process started successfully, parentexiting[mongod@devtest ~]$ mongo 10.1.5.123:28001/admin MongoDB shell version: 3.2.3connecting to: 10.1.5.123:28001/adminMyMongo:SECONDARY>