MongoDB 集群-主从复制（一主二从）

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MongoDB 集群-主从复制（一主二从）
- 官方文档
- 版本
- 启动命令
- 初始化集群
- 验证

官方文档

https://docs.mongodb.com/manual/tutorial/deploy-replica-set/
https://docs.mongodb.com/manual/tutorial/deploy-replica-set-for-testing/
mongo.conf配置文件说明
MongoDB中文社区

版本

mongodb-linux-x86_64-ubuntu1804-5.0.4.tgz 免安装压缩包版本。

启动命令

# 属于副本集 rs0端口为 27018 的mongodb 服务 ./bin/mongod --replSet=rs0 --port=27018 --bind_ip=127.0.0.1 --dbpath=/home/public/Soft/mongodb-5.0.4/primary27018db/ --logpath=/home/public/Soft/mongodb-5.0.4/primary27018db/db.log --directoryperdb --fork > /dev/null 2>&1 &# 属于副本集 rs0端口为 27019 的mongodb 服务 ./bin/mongod --replSet=rs0 --port=27019 --bind_ip=127.0.0.1 --dbpath=/home/public/Soft/mongodb-5.0.4/slave27019db/ --logpath=/home/public/Soft/mongodb-5.0.4/slave27019db/db.log --directoryperdb --fork > /dev/null 2>&1 &# 属于副本集 rs0端口为 27020 的mongodb 服务 ./bin/mongod --replSet=rs0 --port=27020 --bind_ip=127.0.0.1 --dbpath=/home/public/Soft/mongodb-5.0.4/arbiter27020db/ --logpath=/home/public/Soft/mongodb-5.0.4/arbiter27020db/db.log --directoryperdb --fork > /dev/null 2>&1 &

初始化集群

连接27018 端口的MongoDB服务：

./bin/mongo --host=127.0.0.1 --port=27018

连接成功，控制台输出：

MongoDB shell version v5.0.3 connecting to: mongodb://127.0.0.1:27018/?compressors=disabled&gssapiServiceName=mongodb Implicit session: session { "id" : UUID("c9296cbb-8005-4398-8c4c-83a11d3723cc") } MongoDB server version: 5.0.4 ================ Warning: the "mongo" shell has been superseded by "mongosh", which delivers improved usability and compatibility.The "mongo" shell has been deprecated and will be removed in an upcoming release. We recommend you begin using "mongosh". For installation instructions, see https://docs.mongodb.com/mongodb-shell/install/ ================ --- The server generated these startup warnings when booting: 2021-12-03T18:44:52.516+08:00: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine. See http://dochub.mongodb.org/core/prodnotes-filesystem 2021-12-03T18:44:53.247+08:00: Access control is not enabled for the database. Read and write access to data and configuration is unrestricted 2021-12-03T18:44:53.247+08:00: Soft rlimits for open file descriptors too low 2021-12-03T18:44:53.247+08:00: currentValue: 1024 2021-12-03T18:44:53.247+08:00: recommendedMinimum: 64000 --- --- Enable MongoDB's free cloud-based monitoring service, which will then receive and display metrics about your deployment (disk utilization, CPU, operation statistics, etc). The monitoring data will be available on a MongoDB website with a unique URL accessible to you and anyone you share the URL with. MongoDB may use this information to make product improvements and to suggest MongoDB products and deployment options to you. To enable free monitoring, run the following command: db.enableFreeMonitoring() To permanently disable this reminder, run the following command: db.disableFreeMonitoring() ---

执行初始化命令：

rs.initiate( { _id : "rs0", members: [ { _id: 0, host: "127.0.0.1:27018" }, { _id: 1, host: "127.0.0.1:27019" }, { _id: 2, host: "127.0.0.1:27020" } ] })

初始化成功，控制台输出：

> rs.initiate( { ... _id : "rs0", ... members: [ ... { _id: 0, host: "127.0.0.1:27018" }, ... { _id: 1, host: "127.0.0.1:27019" }, ... { _id: 2, host: "127.0.0.1:27020" } ... ] ... }) { "ok" : 1 } rs0:SECONDARY> rs.config() { "_id" : "rs0", "version" : 1, "term" : 0, "members" : [ { "_id" : 0, "host" : "127.0.0.1:27018", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 1, "tags" : { }, "secondaryDelaySecs" : NumberLong(0), "votes" : 1 }, { "_id" : 1, "host" : "127.0.0.1:27019", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 1, "tags" : { }, "secondaryDelaySecs" : NumberLong(0), "votes" : 1 }, { "_id" : 2, "host" : "127.0.0.1:27020", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 1, "tags" : { }, "secondaryDelaySecs" : NumberLong(0), "votes" : 1 } ], "protocolVersion" : NumberLong(1), "writeConcernMajorityJournalDefault" : true, "settings" : { "chainingAllowed" : true, "heartbeatIntervalMillis" : 2000, "heartbeatTimeoutSecs" : 10, "electionTimeoutMillis" : 10000, "catchUpTimeoutMillis" : -1, "catchUpTakeoverDelayMillis" : 30000, "getLastErrorModes" : { }, "getLastErrorDefaults" : { "w" : 1, "wtimeout" : 0 }, "replicaSetId" : ObjectId("61ad7b2d1b25049ef7a3b260") } }

分别查看，发现 27018 是主节点，27019和27020是从节点：

至此一主两从搭建完成。

验证

连接 27018 主节点，新增数据库和集合，并插入一条记录。

# 连接 27018 端口 mongodb 服务 ./bin/mongo --host=127.0.0.1 --port=27018 # 连接成功，选择 replicat_db 数据库 use replicat_db # creplicat_db 数据库下创建 replica_tb 集合 db.createCollection("replica_tb") # replica_tb 集合中插入2条数据 db.replica_tb.insert({name:"black",age:18,high:180.00}) db.replica_tb.insert({name:"black_01",age:20,high:180.00})

控制台输出：

分别连接 27019 和 27020，查看数据库：
执行 show dbs 命令时报错：

rs0:SECONDARY> show dbs uncaught exception: Error: listDatabases failed:{ "topologyVersion" : { "processId" : ObjectId("61ad7ad0873960731110e289"), "counter" : NumberLong(4) }, "ok" : 0, "errmsg" : "not master and slaveOk=false", "code" : 13435, "codeName" : "NotPrimaryNoSecondaryOk", "$clusterTime" : { "clusterTime" : Timestamp(1638760184, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } }, "operationTime" : Timestamp(1638760184, 1) } : _getErrorWithCode@src/mongo/shell/utils.js:25:13 Mongo.prototype.getDBs/<@src/mongo/shell/mongo.js:145:19 Mongo.prototype.getDBs@src/mongo/shell/mongo.js:97:12 shellHelper.show@src/mongo/shell/utils.js:956:13 shellHelper@src/mongo/shell/utils.js:838:15 @(shellhelp2):1:1