centos7部署MongoDB数据库复制集(超详细) 重点:复制集概述;复制集实现原理;复制集的应用案例; 一、概述: 组成: Mongodb复制集(副本集replica set)由一组Mongod实例(进程)组成,包含一个Primary节点和多个Secondary节点,Mongodb Driver(客户端)的所有数据都写入Primary,Secondary通过oplog来同步Primary的数据,保证主节点和从节点数据的一致性,复制集在完成主从复制的基础上,通过心跳机制,一旦primary节点出现宕机,则触发选举一个新的主节点,剩下的secondary节点指向新的primary,时间应该在10-30s内完成感知primary节点故障,实现高可用数据库集群; 特点: 主是唯一的,但不是固定的; 由大多数据原则保证数据的一致性; 从库无法写入(默认情况下,不使用驱动连接时,也是不能查询的); 相对于传统的主从结构,复制集可以自动容灾;

二、原理: 角色(按是否存储数据划分): Primary:主节点,由选举产生,负责客户端的写操作,产生oplog日志文件; Secondary:从节点,负责客户端的读操作,提供数据的备份和故障的切换; Arbiter:仲裁节点,只参与选举的投票,不会成为primary,也不向Primary同步数据,若部署了一个2个节点的复制集,1个Primary,1个Secondary,任意节点宕机,复制集将不能提供服务了(无法选出Primary),这时可以给复制集添加一个Arbiter节点,即使有节点宕机,仍能选出Primary; 角色(按类型区分): Standard(标准):这种是常规节点,它存储一份完整的数据副本,参与投票选举,有可能成为主节点; Passive(被动):存储完整的数据副本,参与投票,不能成为活跃节点。 Arbiter(投票):仲裁节点只参与投票,不接收复制的数据,也不能成为活跃节点。 注:每个参与节点(非仲裁者)有个优先权(0-1000),优先权(priority)为0则是被动的,不能成为活跃节点,优先权不为0的,按照由大到小选出活跃节点,优先值一样的则看谁的数据比较新; 注:Mongodb 3.0里,复制集成员最多50个,参与Primary选举投票的成员最多7个;

选举: 每个节点通过优先级定义出节点的类型(标准、被动、投票); 标准节点通过对比自身数据进行选举出peimary节点或者secondary节点; 影响选举的因素: 1.心跳检测:复制集内成员每隔两秒向其他成员发送心跳检测信息,若10秒内无响应,则标记其为不可用; 2.连接:在多个节点中,最少保证两个节点为活跃状态,如果集群中共三个节点,挂掉两个节点,那么剩余的节点无论状态是primary还是处于选举过程中,都会直接被降权为secondary; 触发选举的情况: 1.初始化状态 2.从节点们无法与主节点进行通信 3.主节点辞职 主节点辞职的情况: 1.在接收到replSetStepDown命令后; 2.在现有的环境中,其他secondary节点的数据落后于本身10s内,且拥有更高优先级; 3.当主节点无法与群集中多数节点通信; 注:当主节点辞职后,主节点将关闭自身所有的连接,避免出现客户端在从节点进行写入操作;

三、应用案例: 异常处理:
当Primary宕机时,如果有数据未同步到Secondary,当Primary重新加入时,如果新的Primary上已经发生了写操作,则旧Primary需要回滚部分操作,以保证数据集与新的Primary一致。旧Primary将回滚的数据写到单独的rollback目录下,数据库管理员可根据需要使用mongorestore进行恢复。

环境: 系统 主机名 IP地址 软件 Centos 7.4 mongodb.benet.com 192.168.100.101 mongodb-linux-x86_64-rhel70-3.6.3.tgz

 实验步骤: 1.安装mongodb; 2.创建并启动四个实例; 3.配置实例; 4.创建复制集并添加节点; 5.模拟Primary节点出现故障,查看角色切换情况; 6.手动切换Primary角色; 7.指定节点的优先级,验证角色重选情况; 8.将标准节点统统停掉,被动节点也不会成为主节点; 9.查询复制集状态以及查看oplog日志文件的大小; 10. 部署用户认证登录(密钥对)的复制集;

 安装mongodb; 下载mongodb软件包; [root@mongodb ~]# tar zxvf mongodb-linux-x86_64-rhel70-3.6.3.tgz [root@mongodb ~]# mv mongodb-linux-x86_64-rhel70-3.6.3 /usr/local/mongodb
[root@mongodb ~]# echo "export PATH=/usr/local/mongodb/bin:$PATH" >>/etc/profile [root@mongodb ~]# source /etc/profile [root@mongodb ~]# ulimit -n 25000 [root@mongodb ~]# ulimit -u 25000 [root@mongodb ~]# echo 0 >/proc/sys/vm/zone_reclaim_mode [root@mongodb ~]# sysctl -w vm.zone_reclaim_mode=0 [root@mongodb ~]# echo never >/sys/kernel/mm/transparent_hugepage/enabled [root@mongodb ~]# echo never >/sys/kernel/mm/transparent_hugepage/defrag

 创建并启动四个实例; [root@mongodb ~]# cd /usr/local/mongodb/bin/ [root@mongodb bin]# mkdir {../mongodb1,../mongodb2,../mongodb3,../mongodb4} [root@mongodb bin]# mkdir ../logs [root@mongodb bin]# touch ../logs/mongodb{1..4}.log [root@mongodb bin]# chmod 777 ../logs/mongodb* [root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb1.conf bind_ip=192.168.100.101 port=27017 dbpath=/usr/local/mongodb/mongodb1/ logpath=/usr/local/mongodb/logs/mongodb1.log logappend=true fork=true maxConns=5000 replSet=haha #replication name END [root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb2.conf bind_ip=192.168.100.101 port=27018 dbpath=/usr/local/mongodb/mongodb2/ logpath=/usr/local/mongodb/logs/mongodb2.log logappend=true fork=true maxConns=5000 replSet=haha END [root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb3.conf bind_ip=192.168.100.101 port=27019 dbpath=/usr/local/mongodb/mongodb3/ logpath=/usr/local/mongodb/logs/mongodb3.log logappend=true fork=true maxConns=5000 replSet=haha END [root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb4.conf bind_ip=192.168.100.101 port=27020 dbpath=/usr/local/mongodb/mongodb4/ logpath=/usr/local/mongodb/logs/mongodb4.log logappend=true fork=true maxConns=5000 replSet=haha END [root@mongodb bin]# cd [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb2.conf [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb3.conf [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb4.conf [root@mongodb ~]# netstat -utpln |grep mongod tcp 0 0 192.168.100.101:27019 0.0.0.0:* LISTEN 2271/mongod
tcp 0 0 192.168.100.101:27020 0.0.0.0:* LISTEN 15260/mongod
tcp 0 0 192.168.100.101:27017 0.0.0.0:* LISTEN 2440/mongod
tcp 0 0 192.168.100.101:27018 0.0.0.0:* LISTEN 1412/mongod
[root@mongodb ~]# echo -e "/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb1.conf \n/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb2.conf\n/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb3.conf\n/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/mongodb4.conf">>/etc/rc.local [root@mongodb ~]# chmod +x /etc/rc.local [root@mongodb ~]# cat <<END >>/etc/init.d/mongodb #!/bin/bash INSTANCE=$1 ACTION=$2 case "$ACTION" in 'start') /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/"$INSTANCE".conf;; 'stop') /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/"$INSTANCE".conf --shutdown;; 'restart') /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/"$INSTANCE".conf --shutdown /usr/local/mongodb/bin/mongod -f /usr/local/mongodb/bin/"$INSTANCE".conf;; esac END [root@mongodb ~]# chmod +x /etc/init.d/mongodb [root@mongodb ~]# /etc/init.d/mongodb mongodb1 stop killing process with pid: 1301 [root@mongodb ~]# /etc/init.d/mongodb mongodb1 start about to fork child process, waiting until server is ready for connections. forked process: 1457 child process started successfully, parent exiting [root@mongodb ~]# mongo --port 27017 --host 192.168.100.101

 配置实例; [root@mongodb ~]# mongo --port 27017 --host 192.168.100.101

show dbs 2018-04-19T04:34:35.871+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:65:1 shellHelper.show@src/mongo/shell/utils.js:816:19 shellHelper@src/mongo/shell/utils.js:706:15 @(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" } rs.isMaster() ##查看复制集节点 { "ismaster" : false, "secondary" : false, "info" : "Does not have a valid replica set config", "isreplicaset" : true, "maxBsonObjectSize" : 16777216, "maxMessageSizeBytes" : 48000000, "maxWriteBatchSize" : 100000, "localTime" : ISODate("2018-04-18T20:36:31.698Z"), "minWireVersion" : 0, "maxWireVersion" : 6, "readOnly" : false, "ok" : 1 } exit [root@mongodb ~]# mongo --port 27018 --host 192.168.100.101 show dbs 2018-04-19T04:34:56.884+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:65:1 shellHelper.show@src/mongo/shell/utils.js:816:19 shellHelper@src/mongo/shell/utils.js:706:15 @(shellhelp2):1:1 exit

 创建复制集并添加节点; [root@mongodb ~]# mongo --port 27017 --host 192.168.100.101

cfg={"_id":"haha","members":[{"_id":0,"host":"192.168.100.101:27017"},{"_id":1,"host":"192.168.100.101:27018"},{"_id":2,"host":"192.168.100.101:27019"}]} ##添加节点 { "_id" : "haha", "members" : [ { "_id" : 0, "host" : "192.168.100.101:27017" }, { "_id" : 1, "host" : "192.168.100.101:27018" }, { "_id" : 2, "host" : "192.168.100.101:27019" } ] } rs.initiate(cfg) ##初始化节点 { "ok" : 1, "operationTime" : Timestamp(1524083843, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524083843, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } haha:OTHER> haha:PRIMARY> haha:PRIMARY> rs.status() { "set" : "haha", "date" : ISODate("2018-04-18T20:37:54.095Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) }, "readConcernMajorityOpTime" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) }, "appliedOpTime" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) } }, "members" : [ { "_id" : 0, "name" : "192.168.100.101:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 329, "optime" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:37:35Z"), "infoMessage" : "could not find member to sync from", "electionTime" : Timestamp(1524083854, 1), "electionDate" : ISODate("2018-04-18T20:37:34Z"), "configVersion" : 1, "self" : true }, { "_id" : 1, "name" : "192.168.100.101:27018", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 30, "optime" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:37:35Z"), "optimeDurableDate" : ISODate("2018-04-18T20:37:35Z"), "lastHeartbeat" : ISODate("2018-04-18T20:37:54.043Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T20:37:52.499Z"), "pingMs" : NumberLong(0), "syncingTo" : "192.168.100.101:27017", "configVersion" : 1 }, { "_id" : 2, "name" : "192.168.100.101:27019", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 30, "optime" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1524083855, 5), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:37:35Z"), "optimeDurableDate" : ISODate("2018-04-18T20:37:35Z"), "lastHeartbeat" : ISODate("2018-04-18T20:37:54.043Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T20:37:52.500Z"), "pingMs" : NumberLong(0), "syncingTo" : "192.168.100.101:27017", "configVersion" : 1 } ], "ok" : 1, "operationTime" : Timestamp(1524083855, 5), "$clusterTime" : { "clusterTime" : Timestamp(1524083855, 5), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } haha:PRIMARY> rs.addArb("192.168.100.101:27020") ##添加仲裁节点 { "ok" : 1, "operationTime" : Timestamp(1524083905, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524083905, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } haha:PRIMARY> rs.status() { "set" : "haha", "date" : ISODate("2018-04-18T20:38:41.468Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1524083915, 1), "t" : NumberLong(1) }, "readConcernMajorityOpTime" : { "ts" : Timestamp(1524083915, 1), "t" : NumberLong(1) }, "appliedOpTime" : { "ts" : Timestamp(1524083915, 1), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1524083915, 1), "t" : NumberLong(1) } }, "members" : [ { "_id" : 0, "name" : "192.168.100.101:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 376, "optime" : { "ts" : Timestamp(1524083915, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:38:35Z"), "infoMessage" : "could not find member to sync from", "electionTime" : Timestamp(1524083854, 1), "electionDate" : ISODate("2018-04-18T20:37:34Z"), "configVersion" : 2, "self" : true }, { "_id" : 1, "name" : "192.168.100.101:27018", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 78, "optime" : { "ts" : Timestamp(1524083905, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1524083905, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:38:25Z"), "optimeDurableDate" : ISODate("2018-04-18T20:38:25Z"), "lastHeartbeat" : ISODate("2018-04-18T20:38:41.134Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T20:38:40.134Z"), "pingMs" : NumberLong(0), "configVersion" : 2 }, { "_id" : 2, "name" : "192.168.100.101:27019", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 78, "optime" : { "ts" : Timestamp(1524083905, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1524083905, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:38:25Z"), "optimeDurableDate" : ISODate("2018-04-18T20:38:25Z"), "lastHeartbeat" : ISODate("2018-04-18T20:38:41.134Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T20:38:40.136Z"), "pingMs" : NumberLong(0), "configVersion" : 2 }, { "_id" : 3, "name" : "192.168.100.101:27020", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 16, "lastHeartbeat" : ISODate("2018-04-18T20:38:41.137Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T20:38:40.140Z"), "pingMs" : NumberLong(0), "configVersion" : 2 } ], "ok" : 1, "operationTime" : Timestamp(1524083915, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524083915, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } 注:rs.add()和rs.remove()命令分别用于添加和删除标准节点 haha:PRIMARY> show dbs admin 0.000GB config 0.000GB local 0.000GB haha:PRIMARY> use cloud switched to db cloud haha:PRIMARY> db.users.insert({"id":"1","name":"xiaoming"}) WriteResult({ "nInserted" : 1 }) haha:PRIMARY> db.users.find() { "_id" : ObjectId("5ad7b245f6308759d4605b5c"), "id" : "1", "name" : "xiaoming" } haha:PRIMARY> show dbs admin 0.000GB cloud 0.000GB config 0.000GB local 0.000GB haha:PRIMARY> exit [root@mongodb ~]# mongo --port 27018 --host 192.168.100.101 haha:SECONDARY> rs.status() { "set" : "haha", "date" : ISODate("2018-04-18T20:50:50.975Z"), "myState" : 2, "term" : NumberLong(1), "syncingTo" : "192.168.100.101:27017", "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) }, "readConcernMajorityOpTime" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) }, "appliedOpTime" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) } }, "members" : [ { "_id" : 0, "name" : "192.168.100.101:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 805, "optime" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:50:45Z"), "optimeDurableDate" : ISODate("2018-04-18T20:50:45Z"), "lastHeartbeat" : ISODate("2018-04-18T20:50:49.966Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T20:50:49.997Z"), "pingMs" : NumberLong(0), "electionTime" : Timestamp(1524083854, 1), "electionDate" : ISODate("2018-04-18T20:37:34Z"), "configVersion" : 2 }, { "_id" : 1, "name" : "192.168.100.101:27018", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 1497, "optime" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:50:45Z"), "syncingTo" : "192.168.100.101:27017", "configVersion" : 2, "self" : true }, { "_id" : 2, "name" : "192.168.100.101:27019", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 805, "optime" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1524084645, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-04-18T20:50:45Z"), "optimeDurableDate" : ISODate("2018-04-18T20:50:45Z"), "lastHeartbeat" : ISODate("2018-04-18T20:50:49.811Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T20:50:49.965Z"), "pingMs" : NumberLong(0), "syncingTo" : "192.168.100.101:27017", "configVersion" : 2 }, { "_id" : 3, "name" : "192.168.100.101:27020", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 745, "lastHeartbeat" : ISODate("2018-04-18T20:50:49.966Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T20:50:50.378Z"), "pingMs" : NumberLong(0), "configVersion" : 2 } ], "ok" : 1, "operationTime" : Timestamp(1524084645, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524084645, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } haha:SECONDARY> show dbs ##secondary节点默认无法读取,可以通过以下方式或者驱动方式实现 2018-04-19T04:52:42.813+0800 E QUERY [thread1] Error: listDatabases failed:{ "operationTime" : Timestamp(1524084755, 1), "ok" : 0, "errmsg" : "not master and slaveOk=false", "code" : 13435, "codeName" : "NotMasterNoSlaveOk", "$clusterTime" : { "clusterTime" : Timestamp(1524084755, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } : _getErrorWithCode@src/mongo/shell/utils.js:25:13 Mongo.prototype.getDBs@src/mongo/shell/mongo.js:65:1 shellHelper.show@src/mongo/shell/utils.js:816:19 shellHelper@src/mongo/shell/utils.js:706:15 @(shellhelp2):1:1 haha:SECONDARY> db.getMongo().setSlaveOk(); haha:SECONDARY> show dbs admin 0.000GB cloud 0.000GB config 0.000GB local 0.000GB haha:SECONDARY> use cloud switched to db cloud haha:SECONDARY> db.users.insert({"id":"2","name":"xiaohong"}) ##secondary节点无法写入 WriteResult({ "writeError" : { "code" : 10107, "errmsg" : "not master" } }) haha:SECONDARY> db.users.find() { "_id" : ObjectId("5ad7b245f6308759d4605b5c"), "id" : "1", "name" : "xiaoming" } haha:SECONDARY> exit

 模拟Primary节点出现故障,查看角色切换情况; [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf --shutdown killing process with pid: 1457 [root@mongodb ~]# mongo --port 27018 --host 192.168.100.101 haha:SECONDARY> rs.status() { "set" : "haha", "date" : ISODate("2018-04-18T21:16:22.623Z"), "myState" : 2, "term" : NumberLong(2), "syncingTo" : "192.168.100.101:27019", "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1524086155, 1), "t" : NumberLong(1) }, "readConcernMajorityOpTime" : { "ts" : Timestamp(1524086155, 1), "t" : NumberLong(1) }, "appliedOpTime" : { "ts" : Timestamp(1524086174, 1), "t" : NumberLong(2) }, "durableOpTime" : { "ts" : Timestamp(1524086174, 1), "t" : NumberLong(2) } }, "members" : [ { "_id" : 0, "name" : "192.168.100.101:27017", "health" : 0, "state" : 8, "stateStr" : "(not reachable/healthy)", "uptime" : 0, "optime" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "optimeDurable" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "optimeDate" : ISODate("1970-01-01T00:00:00Z"), "optimeDurableDate" : ISODate("1970-01-01T00:00:00Z"), "lastHeartbeat" : ISODate("2018-04-18T21:16:19.030Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T21:16:03.344Z"), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "Connection refused", "configVersion" : -1 }, { "_id" : 1, "name" : "192.168.100.101:27018", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 3029, "optime" : { "ts" : Timestamp(1524086174, 1), "t" : NumberLong(2) }, "optimeDate" : ISODate("2018-04-18T21:16:14Z"), "syncingTo" : "192.168.100.101:27019", "infoMessage" : "syncing from: 192.168.100.101:27019", "configVersion" : 2, "self" : true }, { "_id" : 2, "name" : "192.168.100.101:27019", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 2337, "optime" : { "ts" : Timestamp(1524086174, 1), "t" : NumberLong(2) }, "optimeDurable" : { "ts" : Timestamp(1524086174, 1), "t" : NumberLong(2) }, "optimeDate" : ISODate("2018-04-18T21:16:14Z"), "optimeDurableDate" : ISODate("2018-04-18T21:16:14Z"), "lastHeartbeat" : ISODate("2018-04-18T21:16:19.030Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T21:16:21.575Z"), "pingMs" : NumberLong(0), "electionTime" : Timestamp(1524086173, 1), "electionDate" : ISODate("2018-04-18T21:16:13Z"), "configVersion" : 2 }, { "_id" : 3, "name" : "192.168.100.101:27020", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 2277, "lastHeartbeat" : ISODate("2018-04-18T21:16:19.030Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T21:16:20.894Z"), "pingMs" : NumberLong(0), "configVersion" : 2 } ], "ok" : 1, "operationTime" : Timestamp(1524086174, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524086174, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } haha:SECONDARY> exit [root@mongodb ~]# mongo --port 27019 --host 192.168.100.101 haha:PRIMARY> exit [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf

 手动切换Primary角色; [root@mongodb ~]# mongo --port 27019 --host 192.168.100.101 haha:PRIMARY> rs.stepDown(60,30) haha:SECONDARY> exit [root@mongodb ~]# mongo --port 27018 --host 192.168.100.101 haha:PRIMARY> exit

 指定节点的优先级,验证角色重选情况; [root@mongodb ~]# mongo --port 27018 --host 192.168.100.101 haha:PRIMARY> cfg={"_id":"haha","members":[{"_id":0,"host":"192.168.100.101:27017","priority":100},{"_id":1,"host":"192.168.100.101:27018","priority":100},{"_id":2,"host":"192.168.100.101:27019","priority":10}]} { "_id" : "haha", "members" : [ { "_id" : 0, "host" : "192.168.100.101:27017", "priority" : 100 }, { "_id" : 1, "host" : "192.168.100.101:27018", "priority" : 100 }, { "_id" : 2, "host" : "192.168.100.101:27019", "priority" : 10 } ] } haha:PRIMARY> rs.reconfig(cfg) { "ok" : 1, "operationTime" : Timestamp(1524086716, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524086716, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } haha:PRIMARY> rs.isMaster() { "hosts" : [ "192.168.100.101:27017", "192.168.100.101:27018", "192.168.100.101:27019" ], "setName" : "haha", "setVersion" : 3, "ismaster" : true, "secondary" : false, "primary" : "192.168.100.101:27018", "me" : "192.168.100.101:27018", "electionId" : ObjectId("7fffffff0000000000000003"), "lastWrite" : { "opTime" : { "ts" : Timestamp(1524086733, 1), "t" : NumberLong(3) }, "lastWriteDate" : ISODate("2018-04-18T21:25:33Z"), "majorityOpTime" : { "ts" : Timestamp(1524086733, 1), "t" : NumberLong(3) }, "majorityWriteDate" : ISODate("2018-04-18T21:25:33Z") }, "maxBsonObjectSize" : 16777216, "maxMessageSizeBytes" : 48000000, "maxWriteBatchSize" : 100000, "localTime" : ISODate("2018-04-18T21:25:42.122Z"), "logicalSessionTimeoutMinutes" : 30, "minWireVersion" : 0, "maxWireVersion" : 6, "readOnly" : false, "ok" : 1, "operationTime" : Timestamp(1524086733, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524086733, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } haha:PRIMARY> exit [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb2.conf --shutdown [root@mongodb ~]# mongo --port 27017 --host 192.168.100.101 haha:PRIMARY> exit

 将标准节点统统停掉,被动节点也不会成为主节点; [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf --shutdown [root@mongodb ~]# mongo --port 27019 --host 192.168.100.101 haha:SECONDARY> rs.status() { "set" : "haha", "date" : ISODate("2018-04-18T21:29:42.973Z"), "myState" : 2, "term" : NumberLong(5), "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1524086961, 1), "t" : NumberLong(5) }, "readConcernMajorityOpTime" : { "ts" : Timestamp(1524086961, 1), "t" : NumberLong(5) }, "appliedOpTime" : { "ts" : Timestamp(1524086961, 1), "t" : NumberLong(5) }, "durableOpTime" : { "ts" : Timestamp(1524086961, 1), "t" : NumberLong(5) } }, "members" : [ { "_id" : 0, "name" : "192.168.100.101:27017", "health" : 0, "state" : 8, "stateStr" : "(not reachable/healthy)", "uptime" : 0, "optime" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "optimeDurable" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "optimeDate" : ISODate("1970-01-01T00:00:00Z"), "optimeDurableDate" : ISODate("1970-01-01T00:00:00Z"), "lastHeartbeat" : ISODate("2018-04-18T21:29:38.566Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T21:29:26.484Z"), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "Connection refused", "configVersion" : -1 }, { "_id" : 1, "name" : "192.168.100.101:27018", "health" : 0, "state" : 8, "stateStr" : "(not reachable/healthy)", "uptime" : 0, "optime" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "optimeDurable" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "optimeDate" : ISODate("1970-01-01T00:00:00Z"), "optimeDurableDate" : ISODate("1970-01-01T00:00:00Z"), "lastHeartbeat" : ISODate("2018-04-18T21:29:38.566Z"), "lastHeartbeatRecv" : ISODate("2018-04-18T21:26:42.249Z"), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "Connection refused", "configVersion" : -1 }, { "_id" : 2, "name" : "192.168.100.101:27019", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 3826, "optime" : { "ts" : Timestamp(1524086961, 1), "t" : NumberLong(5) }, "optimeDate" : ISODate("2018-04-18T21:29:21Z"), "infoMessage" : "could not find member to sync from", "configVersion" : 3, "self" : true } ], "ok" : 1, "operationTime" : Timestamp(1524086961, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524086961, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } haha:SECONDARY> exit [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf [root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb2.conf [root@mongodb ~]# netstat -utpln |grep mongod tcp 0 0 192.168.100.101:27019 0.0.0.0:* LISTEN 1357/mongod
tcp 0 0 192.168.100.101:27020 0.0.0.0:* LISTEN 1385/mongod
tcp 0 0 192.168.100.101:27017 0.0.0.0:* LISTEN 14363/mongod
tcp 0 0 192.168.100.101:27018 0.0.0.0:* LISTEN 14442/mongod

 查询复制集状态以及查看oplog日志文件的大小; [root@mongodb ~]# mongo --port 27018 --host 192.168.100.101 haha:PRIMARY> use local haha:PRIMARY> rs.printSlaveReplicationInfo() ##查看节点信息 source: 192.168.100.101:27017 syncedTo: Thu Apr 19 2018 05:34:37 GMT+0800 (CST) 0 secs (0 hrs) behind the primary source: 192.168.100.101:27019 syncedTo: Thu Apr 19 2018 05:34:37 GMT+0800 (CST) 0 secs (0 hrs) behind the primary haha:PRIMARY> rs.printReplicationInfo() configured oplog size: 990MB log length start to end: 3464secs (0.96hrs) oplog first event time: Thu Apr 19 2018 04:37:23 GMT+0800 (CST) oplog last event time: Thu Apr 19 2018 05:35:07 GMT+0800 (CST) now: Thu Apr 19 2018 05:35:16 GMT+0800 (CST) haha:PRIMARY> db.oplog.rs.stats() { "ns" : "local.oplog.rs", "size" : 50356, "count" : 450, "avgObjSize" : 111, "storageSize" : 61440, "capped" : true, "max" : -1, "maxSize" : 1038090240, ##单位是KB ...

 部署用户认证登录(密钥对)的复制集; [root@mongodb ~]# mongo --port 27018 --host 192.168.100.101 haha:PRIMARY> use admin switched to db admin haha:PRIMARY> db.createUser({"user":"root","pwd":"123","roles":["root"]}) Successfully added user: { "user" : "root", "roles" : [ "root" ] } haha:PRIMARY> exit [root@mongodb ~]# echo -e "clusterAuthMode=keyFile\nkeyFile=/usr/local/mongodb/bin/cloudkey1" >>/usr/local/mongodb/bin/mongodb1.conf [root@mongodb ~]# echo -e "clusterAuthMode=keyFile\nkeyFile=/usr/local/mongodb/bin/cloudkey2" >>/usr/local/mongodb/bin/mongodb2.conf [root@mongodb ~]# echo -e "clusterAuthMode=keyFile\nkeyFile=/usr/local/mongodb/bin/cloudkey3" >>/usr/local/mongodb/bin/mongodb3.conf [root@mongodb ~]# echo "haha key" >/usr/local/mongodb/bin/cloudkey1 [root@mongodb ~]# echo "haha key" >/usr/local/mongodb/bin/cloudkey2 [root@mongodb ~]# echo "haha key" >/usr/local/mongodb/bin/cloudkey3 [root@mongodb ~]# chmod 600 /usr/local/mongodb/bin/cloudkey* [root@mongodb ~]# /etc/init.d/mongodb mongodb1 restart [root@mongodb ~]# /etc/init.d/mongodb mongodb2 restart [root@mongodb ~]# /etc/init.d/mongodb mongodb3 restart [root@mongodb ~]# mongo --port 27018 --host 192.168.100.101 haha:PRIMARY> show dbs 2018-04-19T12:02:57.720+0800 E QUERY [thread1] Error: listDatabases failed:{ "operationTime" : Timestamp(1524110569, 1), "ok" : 0, "errmsg" : "not authorized on admin to execute command { listDatabases: 1.0, $clusterTime: { clusterTime: Timestamp(1524110569, 1), signature: { hash: BinData(0, 85A5B587BFFE4B2FB534789EA87032CB263D8121), keyId: 6545890313586606081 } }, $db: "admin" }", ... haha:PRIMARY> use admin switched to db admin haha:PRIMARY> db.auth("root","123") 1 haha:PRIMARY> show dbs admin 0.000GB cloud 0.000GB config 0.000GB local 0.000GB haha:PRIMARY> exit