Linux-MongoDB复制集的部署与管理

MongoDB复制集部署:
    1.配置复制集
        创建数据文件和日志文件存储路径:
        [root@localhost ~]# mkdir /data/mongodb{1,2,3,4}
        [root@localhost ~]# touch /data/logs/mongodb/mongodb{1,2,3,4}.log
        [root@localhost ~]# chmod 777 /data/logs/mongodb/mongodb*
    2.编辑4个MongoDB实例的配置文件,配置replSet参数都设置为kgcrs,复制3份,操作如下:
        vim /usr/local/mongodb/bin/mongodb1.conf
            port=27017
            dbpath=/data/mongodb1
            logpath=/data/logs/mongodb/mongodb1.log
            logappend=true
            fork=true
            maxConns=5000
            storageEngine=mmapv1
            httpinterface=true
            replSet=kgcrs
        [root@localhost ~]# cp /usr/local/mongodb/bin/mongodb1.conf /usr/local/mongodb/bin/mongodb2.conf
        [root@localhost ~]# cp /usr/local/mongodb/bin/mongodb1.conf /usr/local/mongodb/bin/mongodb3.conf
        [root@localhost ~]# cp /usr/local/mongodb/bin/mongodb1.conf /usr/local/mongodb/bin/mongodb4.conf
        修改各个配置文件的端口,数据存储路径和日志存放路径
    3.编写启动停止MongoDB脚本,启动4个MongoDB节点实例
        脚本如下:
            [root@localhost ~]# vim mongodb.sh
            #!/bin/bash
            INSTANCE=$1
            ACTION=$2
            case "$ACTION" in
            start)
                    mongod -f /usr/local/mongodb/bin/${INSTANCE}.conf
                    ;;
            stop)
                    mongod -f /usr/local/mongodb/bin/${INSTANCE}.conf --shutdown
                    ;;
            restart)
                    mongod -f /usr/local/mongodb/bin/${INSTANCE}.conf --shutdown
                    mongod -f /usr/local/mongodb/bin/${INSTANCE}.conf
                    ;;
            *)
                    echo "Usage : mongod INSTANCE_NAME(Example:mongodb1) ACTION(start|stop|restart)"
                    ;;
            esac
        [root@localhost ~]# chmod +x mongodb.sh
        [root@localhost ~]# ./mongodb.sh mongodb1 start
        about to fork child process, waiting until server is ready for connections.
        forked process: 4698
        child process started successfully, parent exiting
        [root@localhost ~]# ./mongodb.sh mongodb2 start
        about to fork child process, waiting until server is ready for connections.
        forked process: 4726
        child process started successfully, parent exiting
        [root@localhost ~]# ./mongodb.sh mongodb3 start
        about to fork child process, waiting until server is ready for connections.
        forked process: 4753
        child process started successfully, parent exiting
        [root@localhost ~]# ./mongodb.sh mongodb4 start
        about to fork child process, waiting until server is ready for connections.
        forked process: 4780
        child process started successfully, parent exiting
        [root@localhost ~]# ps -aux | grep mongod
        root       4698  2.7  5.8 1643528 109736 ?      Sl   23:24   0:00 mongod -f /usr/local/mongodb/bin/mongodb1.conf
        root       4726 10.3  4.7 1479580 88616 ?       Sl   23:24   0:01 mongod -f /usr/local/mongodb/bin/mongodb2.conf
        root       4753  4.4  3.2 1151996 60996 ?       Sl   23:24   0:00 mongod -f /usr/local/mongodb/bin/mongodb3.conf
        root       4780  6.6  2.9 1151992 54344 ?       Sl   23:24   0:00 mongod -f /usr/local/mongodb/bin/mongodb4.conf
        root       4805  0.0  0.0 112648   960 pts/0    S+   23:24   0:00 grep --color=auto mongod
        [root@localhost ~]#
    4.初始化配置复制集
        [root@localhost ~]# mongo
        >
        > show dbs
        2020-07-10T23:29:52.190+0800 E QUERY    [thread1] Error: listDatabases failed:{
            "ok" : 0,
            "errmsg" : "not master and slaveOk=false",
            "code" : 13435,
            "codeName" : "NotMasterNoSlaveOk"
        } :
        _getErrorWithCode@src/mongo/shell/utils.js:25:13
        Mongo.prototype.getDBs@src/mongo/shell/mongo.js:62:1
        shellHelper.show@src/mongo/shell/utils.js:814:19
        shellHelper@src/mongo/shell/utils.js:704:15
        @(shellhelp2):1:1
        >
        > rs.status()
        {
            "info" : "run rs.initiate(...) if not yet done for the set",
            "ok" : 0,
            "errmsg" : "no replset config has been received",
            "code" : 94,
            "codeName" : "NotYetInitialized"
        }
        > cfg={"_id":"kgcrs","members":[{"_id":"0","host":"192.168.1.101:27017"},{"id":1,"host":"192.168.1.101:27018"},{"id":2,"host":"192.168.1.101:27019"},{"id":3,"host":"192.168.1.101:27020"}];
        ... }
        2020-07-10T23:33:51.985+0800 E QUERY    [thread1] SyntaxError: missing } after property list @(shell):1:185
        >
        >
        > cfg={"_id":"kgcrs","members":[{"_id":0,"host":"192.168.1.101:27017"},{"_id":2,"host":"192.168.1.101:27019"},{"_id":3,"host":"192.168.1.101:27020"}]}
        {
            "_id" : "kgcrs",
            "members" : [
                {
                    "_id" : 0,
                    "host" : "192.168.1.101:27017"
                },
                {
                    "_id" : 2,
                    "host" : "192.168.1.101:27019"
                },
                {
                    "_id" : 3,
                    "host" : "192.168.1.101:27020"
                }
            ]
        }
        >
        > rs.initiate(cfg)
        { "ok" : 1 }
        kgcrs:OTHER>
        kgcrs:PRIMARY>
            这里先通过rs.status()命令来查看复制集的状态信息,提示复制集还未配置,按着定义cfg初始化参数,最后通过rs.initiate(cfg)命令启动复制集
    5.查看复制集状态
        kgcrs:PRIMARY> rs.status()
        {
            "set" : "kgcrs",
            "date" : ISODate("2020-07-10T15:43:53.841Z"),
            "myState" : 1,
            "term" : NumberLong(1),
            "syncingTo" : "",
            "syncSourceHost" : "",
            "syncSourceId" : -1,
            "heartbeatIntervalMillis" : NumberLong(2000),
            "optimes" : {
                "lastCommittedOpTime" : {
                    "ts" : Timestamp(1594395831, 1),
                    "t" : NumberLong(1)
                },
                "appliedOpTime" : {
                    "ts" : Timestamp(1594395831, 1),
                    "t" : NumberLong(1)
                },
                "durableOpTime" : {
                    "ts" : Timestamp(1594395831, 1),
                    "t" : NumberLong(1)
                }
            },
            "members" : [
                {
                    "_id" : 0,
                    "name" : "192.168.1.101:27017",
                    "health" : 1,
                    "state" : 1,
                    "stateStr" : "PRIMARY",
                    "uptime" : 1171,
                    "optime" : {
                        "ts" : Timestamp(1594395831, 1),
                        "t" : NumberLong(1)
                    },
                    "optimeDate" : ISODate("2020-07-10T15:43:51Z"),
                    "syncingTo" : "",
                    "syncSourceHost" : "",
                    "syncSourceId" : -1,
                    "infoMessage" : "",
                    "electionTime" : Timestamp(1594395640, 1),
                    "electionDate" : ISODate("2020-07-10T15:40:40Z"),
                    "configVersion" : 1,
                    "self" : true,
                    "lastHeartbeatMessage" : ""
                },
                {
                    "_id" : 2,
                    "name" : "192.168.1.101:27019",
                    "health" : 1,
                    "state" : 2,
                    "stateStr" : "SECONDARY",
                    "uptime" : 204,
                    "optime" : {
                        "ts" : Timestamp(1594395831, 1),
                        "t" : NumberLong(1)
                    },
                    "optimeDurable" : {
                        "ts" : Timestamp(1594395831, 1),
                        "t" : NumberLong(1)
                    },
                    "optimeDate" : ISODate("2020-07-10T15:43:51Z"),
                    "optimeDurableDate" : ISODate("2020-07-10T15:43:51Z"),
                    "lastHeartbeat" : ISODate("2020-07-10T15:43:52.367Z"),
                    "lastHeartbeatRecv" : ISODate("2020-07-10T15:43:53.649Z"),
                    "pingMs" : NumberLong(0),
                    "lastHeartbeatMessage" : "",
                    "syncingTo" : "192.168.1.101:27017",
                    "syncSourceHost" : "192.168.1.101:27017",
                    "syncSourceId" : 0,
                    "infoMessage" : "",
                    "configVersion" : 1
                },
                {
                    "_id" : 3,
                    "name" : "192.168.1.101:27020",
                    "health" : 1,
                    "state" : 2,
                    "stateStr" : "SECONDARY",
                    "uptime" : 204,
                    "optime" : {
                        "ts" : Timestamp(1594395831, 1),
                        "t" : NumberLong(1)
                    },
                    "optimeDurable" : {
                        "ts" : Timestamp(1594395831, 1),
                        "t" : NumberLong(1)
                    },
                    "optimeDate" : ISODate("2020-07-10T15:43:51Z"),
                    "optimeDurableDate" : ISODate("2020-07-10T15:43:51Z"),
                    "lastHeartbeat" : ISODate("2020-07-10T15:43:52.367Z"),
                    "lastHeartbeatRecv" : ISODate("2020-07-10T15:43:52.071Z"),
                    "pingMs" : NumberLong(0),
                    "lastHeartbeatMessage" : "",
                    "syncingTo" : "192.168.1.101:27019",
                    "syncSourceHost" : "192.168.1.101:27019",
                    "syncSourceId" : 2,
                    "infoMessage" : "",
                    "configVersion" : 1
                }
            ],
            "ok" : 1
        }
        kgcrs:PRIMARY>
        其中,health为1代表健康,0代表宕机,state为1代表主节点,为2代表从节点
        注意:
            在复制集初始化配置时要保证从节点上没有数据
    6.增加和删除节点:
        复制集启动完了之后,可以通过rs.add()和rs.remove()命令添加和删除节点
        kgcrs:PRIMARY> rs.add("192.168.1.101:27018")
        { "ok" : 1 }
        kgcrs:PRIMARY> rs.remove("192.168.1.101:27020");
        { "ok" : 1 }
        kgcrs:PRIMARY> rs.status()

MongoDB复制集切换:
    1.模拟故障:
        [root@localhost ~]# ps -aux | grep mongod
        root       3413  0.4  2.1 5930868 39876 ?       Sl   18:41   0:01 mongod --config /usr/local/mongodb/bin/mongodb1.conf
        root       3435  0.4  2.1 5866320 40068 ?       Sl   18:41   0:01 mongod --config /usr/local/mongodb/bin/mongodb2.conf
        root       3456  0.4  2.1 5903200 40136 ?       Sl   18:41   0:01 mongod --config /usr/local/mongodb/bin/mongodb3.conf
        root       3477  0.4  3.0 5867348 56704 ?       Sl   18:41   0:01 mongod --config /usr/local/mongodb/bin/mongodb4.conf
        root       3779  0.0  0.0 112652   960 pts/0    S+   18:47   0:00 grep --color=auto mongod
        [root@localhost ~]# kill -2 3413
        [root@localhost ~]# ps -aux | grep mongod
        root       3435  0.4  2.1 5866320 40100 ?       Sl   18:41   0:01 mongod --config /usr/local/mongodb/bin/mongodb2.conf
        root       3456  0.4  2.1 5903200 40140 ?       Sl   18:41   0:01 mongod --config /usr/local/mongodb/bin/mongodb3.conf
        root       3477  0.4  2.9 5867348 55508 ?       Sl   18:41   0:01 mongod --config /usr/local/mongodb/bin/mongodb4.conf
        root       3789  0.0  0.0 112652   960 pts/0    S+   18:47   0:00 grep --color=auto mongod
        关闭实例1(mongodb1):
            可以查看到主节点切换到192.168.1.101:27019即实例3(mongodb3)
                        "_id" : 2,
                        "name" : "192.168.1.101:27019",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
    2.手动进行主从切换:
        再次启动实例1(mongodb1)
            [root@localhost ~]#
            [root@localhost ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf
            about to fork child process, waiting until server is ready for connections.
            forked process: 3829
            child process started successfully, parent exiting
            [root@localhost ~]#
            [root@localhost ~]# ps -aux | grep mongod
            root       3435  0.5  2.1 5866320 40708 ?       Sl   18:41   0:02 mongod --config /usr/local/mongodb/bin/mongodb2.conf
            root       3456  0.5  3.0 5944168 57640 ?       Sl   18:41   0:02 mongod --config /usr/local/mongodb/bin/mongodb3.conf
            root       3477  0.4  2.9 5867348 55800 ?       Sl   18:41   0:02 mongod --config /usr/local/mongodb/bin/mongodb4.conf
            root       3829  1.0  3.8 5866912 71356 ?       Sl   18:49   0:00 mongod -f /usr/local/mongodb/bin/mongodb1.conf
            root       3912  0.0  0.0 112652   960 pts/0    S+   18:49   0:00 grep --color=auto mongod
        登录实例3(mongdb3)
            [root@localhost ~]# mongo --port 27019
            kgcrs:PRIMARY> rs.freeze(30);
            {
                "ok" : 0,
                "errmsg" : "cannot freeze node when primary or running for election. state: Primary",
                "code" : 95,
                "codeName" : "NotSecondary"
            }
            kgcrs:PRIMARY> rs.stepDown(60,30);
            输入以上两条命令后发现主节点转移为实例2(mongodb2):
                "_id" : 1,
                "name" : "192.168.1.101:27018",
                "health" : 1,
                "state" : 1,
                "stateStr" : "PRIMARY",
            注:
                rs.freeze(30)为暂停30秒不参加选举
                rs.stepDown(60,30):告诉主节点交出主节点位置,然后维持从节点状态不少于60秒,同时等待30秒以使主节点和从节点日志同步
MongoDB复制选举原理:
    复制原理:
        复制是基于oplog,相当于MySQL数据库的二进制日志,只记录发生该表的记录。复制是将主节点的oplog日志同步并应用到其它从节点的过程
    选举原理:
        节点类型分为标准节点(host),被动节点(passive),仲裁节点(arbiter)
        1.只有标准节点可能被选举为活跃节点(primary),有选举权。被动节点有完整副本,不可能成为活跃节点,有选举权。仲裁节点不复制数据,不可能成为活跃节点,只有选举权
        2.标准节点和被动节点的区别:priority值高者是标准节点,低者则为被动节点。
        3.选举规则是票数高者获胜,priority是优先权为0~1000的值,相当于额外增加0~1000的票数。选举结果:票数高者获胜,若票数相同,数据新者获胜:
            如图所示:

    验证复制集的选举原理:
        1.查看oplog日志:
            [root@localhost ~]# mongo --port 27018
            kgcrs:PRIMARY>
            kgcrs:PRIMARY> show dbs;
            admin  0.078GB
            local  2.077GB
            kgcrs:PRIMARY> use kgc;
            switched to db kgc
            kgcrs:PRIMARY> db.t1.insert({"id":1,"name":"Tome"})
            WriteResult({ "nInserted" : 1 })
            kgcrs:PRIMARY> db.t1.insert({"id":2,"name":"Jerry"})
            WriteResult({ "nInserted" : 1 })
            kgcrs:PRIMARY> db.t1.find()
            { "_id" : ObjectId("5f09a1951ad8248fd8a53d49"), "id" : 1, "name" : "Tome" }
            { "_id" : ObjectId("5f09a1b51ad8248fd8a53d4a"), "id" : 2, "name" : "Jerry" }
            kgcrs:PRIMARY> db.t1.update({"id":2},{"$set":{"name":"Bob"}})
            WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
            kgcrs:PRIMARY> use local
            switched to db local
            kgcrs:PRIMARY> use kgc
            switched to db kgc
            kgcrs:PRIMARY> db.t1.remove({"id":2})
            WriteResult({ "nRemoved" : 1 })
            kgcrs:PRIMARY> use local
            switched to db local
            kgcrs:PRIMARY> show collections
            me
            oplog.rs
            replset.election
            replset.minvalid
            startup_log
            system.indexes
            system.replset
            kgcrs:PRIMARY> db.oplog.rs.find()
            { "ts" : Timestamp(1594464303, 1), "h" : NumberLong("7752197714819355477"), "v" : 2, "op" : "n", "ns" : "", "o" : { "msg" : "initiating set" } }
            { "ts" : Timestamp(1594464315, 1), "t" : NumberLong(1), "h" : NumberLong("2460754299542242563"), "v" : 2, "op" : "n", "ns" : "", "o" : { "msg" : "new primary" } }
            { "ts" : Timestamp(1594464325, 1), "t" : NumberLong(1), "h" : NumberLong("-5883241644124023360"), "v" : 2, "op" : "n", "ns" : "", "o" : { "msg" : "periodic noop" } }
            其中每个文档都代表主节点上执行的一个操作,oplog会包含所有对数据有修改的操作(查询操作不会记录)
        2.配置复制集的优先级:
            kgcrs:PRIMARY> cfg={"_id":"kgcrs","members":[{"_id":0,"host":"192.168.1.101:27017","priority":100},{"_id":1,"host":"192.168.1.101:27018","priority":100},{"_id":2,"host":"192.168.1.101:27019","priority":0},{"_id":3,"host":"192.168.1.101:27020","arbiterOnly":true}]}
            {
                "_id" : "kgcrs",
                "members" : [
                    {
                        "_id" : 0,
                        "host" : "192.168.1.101:27017",
                        "priority" : 100
                    },
                    {
                        "_id" : 1,
                        "host" : "192.168.1.101:27018",
                        "priority" : 100
                    },
                    {
                        "_id" : 2,
                        "host" : "192.168.1.101:27019",
                        "priority" : 0
                    },
                    {
                        "_id" : 3,
                        "host" : "192.168.1.101:27020",
                        "arbiterOnly" : true
                    }
                ]
            }
            kgcrs:PRIMARY>
            kgcrs:PRIMARY>
            kgcrs:PRIMARY> rs.reconfig(cfg)
            { "ok" : 1 }
            kgcrs:PRIMARY> rs.isMaster()
            {
                "hosts" : [
                    "192.168.1.101:27017",
                    "192.168.1.101:27018"
                ],
                "passives" : [
                    "192.168.1.101:27019"
                ],
                "arbiters" : [
                    "192.168.1.101:27020"
                ],
                "setName" : "kgcrs",
                "setVersion" : 4,
                "ismaster" : true,
                "secondary" : false,
                "primary" : "192.168.1.101:27018",
                "me" : "192.168.1.101:27018",
                "electionId" : ObjectId("7fffffff0000000000000003"),
                "lastWrite" : {
                    "opTime" : {
                        "ts" : Timestamp(1594467801, 1),
                        "t" : NumberLong(3)
                    },
                    "lastWriteDate" : ISODate("2020-07-11T11:43:21Z")
                },
                "maxBsonObjectSize" : 16777216,
                "maxMessageSizeBytes" : 48000000,
                "maxWriteBatchSize" : 1000,
                "localTime" : ISODate("2020-07-11T11:43:26.967Z"),
                "maxWireVersion" : 5,
                "minWireVersion" : 0,
                "readOnly" : false,
                "ok" : 1
            }
            kgcrs:PRIMARY>
            其中,hosts包括标准节点,passive包含被动节点,arbiters包含仲裁节点
        3.模拟节点故障
            关闭主节点实例即mongdb2:
                [root@localhost ~]# ps -aux | grep mongod
                root       3435  0.5  3.2 6115928 59860 ?       Sl   18:41   0:20 mongod --config /usr/local/mongodb/bin/mongodb2.conf
                [root@localhost ~]# kill -2 3435
            查看当前master:
                "_id" : 0,
                "name" : "192.168.1.101:27017",
                "health" : 1,
                "state" : 1,
                "stateStr" : "PRIMARY",
        4.模拟所有标准节点都出现故障
            [root@localhost ~]# ps -axu | grep mongod
                root       3456  0.5  3.1 6109036 59308 ?       Sl   18:41   0:22 mongod --config /usr/local/mongodb/bin/mongodb3.conf
                root       3829  0.5  3.9 6066608 73388 ?       Sl   18:49   0:20 mongod -f /usr/local/mongodb/bin/mongodb1.conf
                root      43939  0.4  3.8 5504688 72616 ?       Sl   19:49   0:01 mongod -f /usr/local/mongodb/bin/mongodb4.conf
                root      44022  0.0  0.0 112656   956 pts/0    S+   19:54   0:00 grep --color=auto mongod
            [root@localhost ~]# kill -2 3829
            [root@localhost ~]# ps -axu | grep mongod
                root       3456  0.5  3.1 6109036 59604 ?       Sl   18:41   0:23 mongod --config /usr/local/mongodb/bin/mongodb3.conf
                root      43939  0.4  3.9 5504688 72992 ?       Sl   19:49   0:01 mongod -f /usr/local/mongodb/bin/mongodb4.conf
                root      44032  0.0  0.0 112656   960 pts/0    S+   19:54   0:00 grep --color=auto mongod
            [root@localhost ~]#
            [root@localhost ~]# mongo --port 27019
            kgcrs:SECONDARY>
            kgcrs:SECONDARY> rs.status()
                "_id" : 2,
                "name" : "192.168.1.101:27019",
                "health" : 1,
                "state" : 2,
                "stateStr" : "SECONDARY",
            结论:
                如果所有节点都出现故障,被动节点也不能成为主节点。
MongoDB复制集管理:
    1.配置允许在从节点读取数据
        默认MongoDB复制集的从节点不能读取数据,可以使用rs.slaveOk()命令允许能够在从节点读取数据
        [root@localhost ~]# ps -aux | grep mongod
            root       3456  0.5  3.2 6109036 59764 ?       Sl   18:41   0:24 mongod --config /usr/local/mongodb/bin/mongodb3.conf
            root      43939  0.4  3.9 5504688 73048 ?       Sl   19:49   0:02 mongod -f /usr/local/mongodb/bin/mongodb4.conf
            root      44074  0.0  0.0 112656   956 pts/0    S+   19:58   0:00 grep --color=auto mongod
        [root@localhost ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf
        about to fork child process, waiting until server is ready for connections.
        forked process: 44091
        child process started successfully, parent exiting
        [root@localhost ~]# mongod -f /usr/local/mongodb/bin/mongodb2.conf
        about to fork child process, waiting until server is ready for connections.
        forked process: 44158
        child process started successfully, parent exiting
        [root@localhost ~]# !ps
        ps -aux | grep mongod
            root       3456  0.5  3.2 6109036 59844 ?       Sl   18:41   0:24 mongod --config /usr/local/mongodb/bin/mongodb3.conf
            root      43939  0.4  3.9 5505716 73056 ?       Sl   19:49   0:02 mongod -f /usr/local/mongodb/bin/mongodb4.conf
            root      44091  1.8  4.5 6009536 85704 ?       Sl   19:59   0:00 mongod -f /usr/local/mongodb/bin/mongodb1.conf
            root      44158  3.6  4.5 6009536 85180 ?       Sl   19:59   0:00 mongod -f /usr/local/mongodb/bin/mongodb2.conf
            root      44229  0.0  0.0 112656   960 pts/0    S+   19:59   0:00 grep --color=auto mongod
        [root@localhost ~]# mongo
        kgcrs:PRIMARY> rs.status()
        kgcrs:PRIMARY> rs.help()
        kgcrs:PRIMARY> use kgc
        switched to db kgc
        kgcrs:PRIMARY> show collections
        system.indexes
        t1
        kgcrs:PRIMARY> exit
        bye

        [root@localhost ~]# mongo --port 27018
        kgcrs:SECONDARY> show dbs;
        2020-07-11T20:00:41.101+0800 E QUERY    [thread1] Error: listDatabases failed:{
            "ok" : 0,
            "errmsg" : "not master and slaveOk=false",
            "code" : 13435,
        "codeName" : "NotMasterNoSlaveOk"
        } :
        _getErrorWithCode@src/mongo/shell/utils.js:25:13
        Mongo.prototype.getDBs@src/mongo/shell/mongo.js:62:1
        shellHelper.show@src/mongo/shell/utils.js:814:19
        shellHelper@src/mongo/shell/utils.js:704:15
        @(shellhelp2):1:1
        kgcrs:SECONDARY> rs.slaveOk()
        kgcrs:SECONDARY> show dbs;
        admin  0.078GB
        kgc    0.078GB
        local  2.077GB
    2.查看复制状态信息
        可以使用rs.printReplicationInfo()和rs.printSlaveReplicationInfo()命令来查看复制集状态
            kgcrs:SECONDARY> rs.status()
            kgcrs:SECONDARY> rs.printSlaveReplicationInfo()
            source: 192.168.1.101:27018
                syncedTo: Sat Jul 11 2020 20:05:19 GMT+0800 (CST)
                0 secs (0 hrs) behind the primary
            source: 192.168.1.101:27019
                syncedTo: Sat Jul 11 2020 20:05:19 GMT+0800 (CST)
                0 secs (0 hrs) behind the primary
            kgcrs:SECONDARY> rs.printReplicationInfo()
            configured oplog size:   1229.484375MB
            log length start to end: 4866secs (1.35hrs)
            oplog first event time:  Sat Jul 11 2020 18:45:03 GMT+0800 (CST)
            oplog last event time:   Sat Jul 11 2020 20:06:09 GMT+0800 (CST)
            now:                     Sat Jul 11 2020 20:06:12 GMT+0800 (CST)
            kgcrs:SECONDARY> use local
            switched to db local
            kgcrs:SECONDARY> show collections
            me
            oplog.rs
            replset.election
            replset.minvalid
            startup_log
            system.indexes
            system.replset
            kgcrs:SECONDARY> db.system.replset.findOne()
    3.更改oplog大小
        oplog集operation log的简写,存储在local数据库中。oplog中新操作会自动替换旧的操作,以保证oplog不会超过预设的大小。默认情况下,oplog大小会占64位的实例5%的可用磁盘空间
            kgcrs:PRIMARY> use local
            kgcrs:PRIMARY> rs.printReplicationInfo()
            kgcrs:PRIMARY> db.oplog.rs.stats()
            {
                "ns" : "local.oplog.rs",
                "size" : 48676,
                "count" : 505,
                "avgObjSize" : 96,
                "numExtents" : 1,
                "storageSize" : 1512243200,
                "lastExtentSize" : 1512243200,
                "paddingFactor" : 1,
                "paddingFactorNote" : "paddingFactor is unused and unmaintained in 3.0. It remains hard coded to 1.0 for compatibility only.",
                "userFlags" : 1,
                "capped" : true,
                "max" : NumberLong("9223372036854775807"),
                "maxSize" : 1512243200,
                "nindexes" : 0,
                "totalIndexSize" : 0,
                "indexSizes" : {
                    
                },
                "ok" : 1
            }
            kgcrs:PRIMARY> db.runCommand({"convertToCapped":"oplog.rs","size":"1024000000"})
    4.部署认证的复制:
        [root@localhost ~]# mongo
        kgcrs:PRIMARY> use admin
        switched to db admin
        kgcrs:PRIMARY> db.createUser({"user":"root","pwd":"123","roles":["root"]})
        Successfully added user: { "user" : "root", "roles" : [ "root" ] }
        kgcrs:PRIMARY> exit
        bye
        [root@localhost ~]# vim /usr/local/mongodb/bin/mongodb1.conf
            添加以下内容:
                clusterAuthMode=keyFile
                keyFile=/usr/local/mongodb/bin/kgcrskey1
        [root@localhost ~]# vim /usr/local/mongodb/bin/mongodb2.conf
        [root@localhost ~]# vim /usr/local/mongodb/bin/mongodb3.conf
        [root@localhost ~]# vim /usr/local/mongodb/bin/mongodb4.conf
        [root@localhost ~]# cd /usr/local/mongodb/bin/  
        [root@localhost bin]# echo "kgcrs key" > kgcrskey1      # 生成4个实例的秘钥文件
        [root@localhost bin]# echo "kgcrs key" > kgcrskey2
        [root@localhost bin]# echo "kgcrs key" > kgcrskey3
        [root@localhost bin]# echo "kgcrs key" > kgcrskey4
        [root@localhost bin]# chmod 600 kgcrskey{1..4}
        [root@localhost ~]# ./sh_mongo.sh mongodb1 restart      # 重启四个实例
        [root@localhost ~]# ./sh_mongo.sh mongodb2 restart
        [root@localhost ~]# ./sh_mongo.sh mongodb3 restart
        [root@localhost ~]# ./sh_mongo.sh mongodb4 restart
        [root@localhost ~]# mongo
        kgcrs:PRIMARY> show dbs
        2020-07-11T20:34:54.075+0800 E QUERY    [thread1] Error: listDatabases failed:{
            "ok" : 0,
            "errmsg" : "not authorized on admin to execute command { listDatabases: 1.0 }",
            "code" : 13,
            "codeName" : "Unauthorized"
        } :
        _getErrorWithCode@src/mongo/shell/utils.js:25:13
        Mongo.prototype.getDBs@src/mongo/shell/mongo.js:62:1
        shellHelper.show@src/mongo/shell/utils.js:814:19
        shellHelper@src/mongo/shell/utils.js:704:15
        @(shellhelp2):1:1
        kgcrs:PRIMARY> rs.status()
        {
            "ok" : 0,
            "errmsg" : "not authorized on admin to execute command { replSetGetStatus: 1.0 }",
            "code" : 13,
            "codeName" : "Unauthorized"
        }
        kgcrs:PRIMARY> use admin
        switched to db admin
        kgcrs:PRIMARY> db.auth("root","123")
        1
        kgcrs:PRIMARY> rs.status()
        {
            "set" : "kgcrs",
            "date" : ISODate("2020-07-11T12:35:25.636Z"),
            "myState" : 1,
            "term" : NumberLong(9),
            "syncingTo" : "",
            "syncSourceHost" : "",
            "syncSourceId" : -1,
            "heartbeatIntervalMillis" : NumberLong(2000),
            "optimes" : {
                "lastCommittedOpTime" : {
                    "ts" : Timestamp(1594470917, 1),
                    "t" : NumberLong(9)
                },
                "appliedOpTime" : {
                    "ts" : Timestamp(1594470917, 1),
                    "t" : NumberLong(9)
                },
                "durableOpTime" : {
                    "ts" : Timestamp(1594470917, 1),
                    "t" : NumberLong(9)
                }
            },
            "members" : [
            ...
            ]
        }
        kgcrs:PRIMARY> show dbs;
        admin  0.078GB
        kgc    0.078GB
        local  2.077GB
        kgcrs:PRIMARY> exit
        bye

Linux-MongoDB复制集的部署与管理

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