前言
近期有同学问mongodb副本集难不难部署,我的回答是不难,很快,几分钟搞定,比mysql MHA简单的不止一点半点。 那么到底如何部署呢?请看下文。
1. 准备工作
1.1 下载软件
选择版本并下载mongodb的软件,注意操作系统版本等。本次我选用的是percona分支的mongodb 4.2.8版本搭建,操作系统为centos6
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cd /usr/local/ wget https: //www .percona.com /downloads/percona-server-mongodb-LATEST/percona-server-mongodb-4 .2.8-8 /binary/tarball/percona-server-mongodb-4 .2.8-8-centos6-x86_64. tar .gz tar -zxvf percona-server-mongodb-4.2.8-8-centos6-x86_64. tar .gz ln -s percona-server-mongodb-4.2.8-8 mongodb |
1.2 规划各节点角色
各节点角色如下
IP | port | role |
192.168.128.208 | 27017 | PRIMARY |
192.168.128.209 | 27017 | SECONDARY |
192.168.128.209 | 28017 | ARBITER |
2 部署
2.1 创建各节点相关目录
创建数据目录、日志目录等相关目录
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[root@m1 ~] # mkdir -p /data/mongodb/27017/{data,logs,tmp,etc,keyfile} [root@m1 ~] # cd /data/mongodb/27017/ [root@m1 27017] # ll 总用量 20 drwxr-xr-x 2 root root 4096 8月 7 16:59 data drwxr-xr-x 2 root root 4096 8月 7 16:59 etc drwxr-xr-x 2 root root 4096 8月 7 16:59 keyfile drwxr-xr-x 2 root root 4096 8月 7 16:59 logs drwxr-xr-x 2 root root 4096 8月 7 16:59 tmp |
2.2 配置文件
创建配置文件,并添加对应的配置信息,注意仲裁节点的端口
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[root@m1 27017] # cd /data/mongodb/27017/etc/ [root@m1 etc] # vim mongod.conf 添加如下内容 storage: dbPath: /data/mongodb/27017/data journal: enabled: true systemLog: destination: file logAppend: true path: /data/mongodb/27017/logs/mongod .log processManagement: fork: true pidFilePath: /data/mongodb/27017/tmp/mongod .pid net: port: 27017 bindIp: 0.0.0.0replication: replSetName: "test1" # 副本集名称 |
2.3 启动各节点
以其中一个节点为例,其他节点修改对应配置文件即可
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[root@m1 local ] # /usr/local/mongodb/bin/mongod -f /data/mongodb/27017/etc/mongod.conf about to fork child process, waiting until server is ready for connections. forked process: 30019 child process started successfully, parent exiting |
2.4 初始化副本集
初始化副本集,指定各节点id及角色,注意副本集的名称和配置文件里一致。
在任意节点执行如下语句
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> use admin switched to db admin > rs.initiate( { ... _id: "test1" , ... members: [ ... { _id: 0 , host: "192.168.128.208:27017" }, ... { _id: 1 , host: "192.168.128.209:27017" }, ... { _id: 2 , host: "192.168.128.209:28017" ,arbiterOnly: true } ... ] }) { "ok" : 1 , "$clusterTime" : { "clusterTime" : Timestamp( 1596792682 , 1 ), "signature" : { "hash" : BinData( 0 , "AAAAAAAAAAAAAAAAAAAAAAAAAAA=" ), "keyId" : NumberLong( 0 ) } }, "operationTime" : Timestamp( 1596792682 , 1 ) } |
完成后可以查看各集群状态,如下,可见当前192.168.128.208:27017 为PRIMARY节点
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test1:PRIMARY> rs.status() { "set" : "test1" , "date" : ISODate( "2020-08-07T11:09:24.454Z" ), "myState" : 1, "term" : NumberLong(1), "syncingTo" : "" , "syncSourceHost" : "" , "syncSourceId" : -1, "heartbeatIntervalMillis" : NumberLong(2000), "majorityVoteCount" : 2, "writeMajorityCount" : 2, "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1596798563, 1), "t" : NumberLong(1) }, "lastCommittedWallTime" : ISODate( "2020-08-07T11:09:23.663Z" ), "readConcernMajorityOpTime" : { "ts" : Timestamp(1596798563, 1), "t" : NumberLong(1) }, "readConcernMajorityWallTime" : ISODate( "2020-08-07T11:09:23.663Z" ), "appliedOpTime" : { "ts" : Timestamp(1596798563, 1), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1596798563, 1), "t" : NumberLong(1) }, "lastAppliedWallTime" : ISODate( "2020-08-07T11:09:23.663Z" ), "lastDurableWallTime" : ISODate( "2020-08-07T11:09:23.663Z" ) }, "lastStableRecoveryTimestamp" : Timestamp(1596798513, 1), "lastStableCheckpointTimestamp" : Timestamp(1596798513, 1), "electionCandidateMetrics" : { "lastElectionReason" : "electionTimeout" , "lastElectionDate" : ISODate( "2020-08-07T09:31:33.409Z" ), "electionTerm" : NumberLong(1), "lastCommittedOpTimeAtElection" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "lastSeenOpTimeAtElection" : { "ts" : Timestamp(1596792682, 1), "t" : NumberLong(-1) }, "numVotesNeeded" : 2, "priorityAtElection" : 1, "electionTimeoutMillis" : NumberLong(10000), "numCatchUpOps" : NumberLong(0), "newTermStartDate" : ISODate( "2020-08-07T09:31:33.444Z" ), "wMajorityWriteAvailabilityDate" : ISODate( "2020-08-07T09:31:34.050Z" ) }, "members" : [ { "_id" : 0, "name" : "192.168.128.208:27017" , "health" : 1, "state" : 1, "stateStr" : "PRIMARY" , "uptime" : 5950, "optime" : { "ts" : Timestamp(1596798563, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate( "2020-08-07T11:09:23Z" ), "syncingTo" : "" , "syncSourceHost" : "" , "syncSourceId" : -1, "infoMessage" : "" , "electionTime" : Timestamp(1596792693, 1), "electionDate" : ISODate( "2020-08-07T09:31:33Z" ), "configVersion" : 1, "self" : true , "lastHeartbeatMessage" : "" }, { "_id" : 1, "name" : "192.168.128.209:27017" , "health" : 1, "state" : 2, "stateStr" : "SECONDARY" , "uptime" : 5882, "optime" : { "ts" : Timestamp(1596798563, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1596798563, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate( "2020-08-07T11:09:23Z" ), "optimeDurableDate" : ISODate( "2020-08-07T11:09:23Z" ), "lastHeartbeat" : ISODate( "2020-08-07T11:09:23.672Z" ), "lastHeartbeatRecv" : ISODate( "2020-08-07T11:09:22.804Z" ), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "" , "syncingTo" : "192.168.128.208:27017" , "syncSourceHost" : "192.168.128.208:27017" , "syncSourceId" : 0, "infoMessage" : "" , "configVersion" : 1 }, { "_id" : 2, "name" : "192.168.128.209:28017" , "health" : 1, "state" : 7, "stateStr" : "ARBITER" , "uptime" : 5882, "lastHeartbeat" : ISODate( "2020-08-07T11:09:23.672Z" ), "lastHeartbeatRecv" : ISODate( "2020-08-07T11:09:22.952Z" ), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "" , "syncingTo" : "" , "syncSourceHost" : "" , "syncSourceId" : -1, "infoMessage" : "" , "configVersion" : 1 } ], "ok" : 1, "$clusterTime" : { "clusterTime" : Timestamp(1596798563, 1), "signature" : { "hash" : BinData(0, "AAAAAAAAAAAAAAAAAAAAAAAAAAA=" ), "keyId" : NumberLong(0) } }, "operationTime" : Timestamp(1596798563, 1) } test1:PRIMARY> |
3 修改为认证模式
为考虑安全性等,需要开启认证模式(需要通过用户名/密码方式登录)
3.1 创建用户
创建超级管理员账号
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test1:PRIMARY> db.createUser({user: "root" , pwd : "Root#123" , roles: [{role: "root" , db: "admin" }]}) Successfully added user: { "user" : "root" , "roles" : [ { "role" : "root" , "db" : "admin" } ] } |
3.2 创建key文件
在主库上执行脚本生成key文件,然后将结拷贝到另外2个节点
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[root@m1 mongodb] # cd /data/mongodb/27017/keyfile/ [root@m1 keyfile] # openssl rand -base64 756 > mongo.key [root@m1 keyfile] # chmod 600 mongo.key # 必须修改为600权限,否则无法启动 |
以上完成后,将文件复制到另外2个节点
3.3 修改配置文件
配置文件中 添加如下内容,注意不同节点的文件路径
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security: authorization: enabled clusterAuthMode: keyFile keyFile: /data/mongodb/27017/keyfile/mongo .key |
3.4 重启后并用认证模式登陆
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# 关闭mongodb [root@m1 keyfile] # /usr/local/mongodb/bin/mongod -f /data/mongodb/27017/etc/mongod.conf -shutdown killing process with pid: 30675 # 启动mongodb [root@m1 keyfile] # /usr/local/mongodb/bin/mongod -f /data/mongodb/27017/etc/mongod.conf about to fork child process, waiting until server is ready for connections. forked process: 2430 child process started successfully, parent exiting # 认证模式登陆 [root@m1 keyfile] # [root@m1 keyfile] # /usr/local/mongodb/bin/mongo -u root -p 'Root#123' --authenticationDatabase admin |
至此,mongodb 副本集搭建完毕,你会了吗?
总结
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原文链接:https://www.cnblogs.com/gjc592/p/13454845.html