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；
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.confbind_ip=192.168.100.101port=27017dbpath=/usr/local/mongodb/mongodb1/logpath=/usr/local/mongodb/logs/mongodb1.loglogappend=truefork=truemaxConns=5000replSet=haha#replication nameEND[root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb2.confbind_ip=192.168.100.101port=27018dbpath=/usr/local/mongodb/mongodb2/logpath=/usr/local/mongodb/logs/mongodb2.loglogappend=truefork=truemaxConns=5000replSet=hahaEND[root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb3.confbind_ip=192.168.100.101port=27019dbpath=/usr/local/mongodb/mongodb3/logpath=/usr/local/mongodb/logs/mongodb3.loglogappend=truefork=truemaxConns=5000replSet=hahaEND[root@mongodb bin]# cat <<END >>/usr/local/mongodb/bin/mongodb4.confbind_ip=192.168.100.101port=27020dbpath=/usr/local/mongodb/mongodb4/logpath=/usr/local/mongodb/logs/mongodb4.loglogappend=truefork=truemaxConns=5000replSet=hahaEND[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 mongodtcp 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/bashINSTANCE=\$1ACTION=\$2case "\$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;;esacEND[root@mongodb ~]# chmod +x /etc/init.d/mongodb[root@mongodb ~]# /etc/init.d/mongodb mongodb1 stopkilling process with pid: 1301[root@mongodb ~]# /etc/init.d/mongodb mongodb1 startabout to fork child process, waiting until server is ready for connections.forked process: 1457child 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 dbs2018-04-19T04:34:35.871+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:25:13br/>_getErrorWithCode@src/mongo/shell/utils.js:25:13
shellHelper.show@src/mongo/shell/utils.js:816:19
@(shellhelp2):1:1
_getErrorWithCode@src/mongo/shell/utils.js:25:13
shellHelper.show@src/mongo/shell/utils.js:816:19
@(shellhelp2):1:1
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 dbsadmin 0.000GBconfig 0.000GBlocal 0.000GBhaha:PRIMARY> use cloudswitched to db cloudhaha: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 dbsadmin 0.000GBcloud 0.000GBconfig 0.000GBlocal 0.000GBhaha:PRIMARY> exit[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101haha: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:25:13br/>_getErrorWithCode@src/mongo/shell/utils.js:25:13
shellHelper.show@src/mongo/shell/utils.js:816:19
@(shellhelp2):1:1
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 --shutdownkilling 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),"$clusterTime" : {"clusterTime" : Timestamp(1524086174, 1),"signature" : {"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),"keyId" : NumberLong(0)}}}haha:SECONDARY> exit[root@mongodb ~]# mongo --port 27019 --host 192.168.100.101haha:PRIMARY> exit[root@mongodb ~]# mongod -f /usr/local/mongodb/bin/mongodb1.conf
手动切换Primary角色；[root@mongodb ~]# mongo --port 27019 --host 192.168.100.101haha:PRIMARY> rs.stepDown(60,30)haha:SECONDARY> exit[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101haha:PRIMARY> exit
指定节点的优先级，验证角色重选情况；[root@mongodb ~]# mongo --port 27018 --host 192.168.100.101haha:PRIMARY> cfg={"_id":"haha","members":[{"_id":0,"host":"192.168.100.101:27017","priority":100},{"_id":1,"host":"192.168.100.101:27018","priority":100},{"_id":2,"host":"192.168.100.101:27019","priority":10}]}{"_id" : "haha","members" : [{"_id" : 0,"host" : "192.168.100.101:27017","priority" : 100},{"_id" : 1,"host" : "192.168.100.101:27018","priority" : 100},{"_id" : 2,"host" : "192.168.100.101:27019","priority" : 10}]}haha:PRIMARY> rs.reconfig(cfg){"ok" : 1,"operationTime" : Timestamp(1524086716, 1),"$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 mongodtcp 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 192.168.100.101haha:PRIMARY> use localhaha:PRIMARY> rs.printSlaveReplicationInfo() ##查看节点信息source: 192.168.100.101:27017syncedTo: Thu Apr 19 2018 05:34:37 GMT+0800 (CST)0 secs (0 hrs) behind the primary source: 192.168.100.101:27019syncedTo: Thu Apr 19 2018 05:34:37 GMT+0800 (CST)0 secs (0 hrs) behind the primary haha:PRIMARY> rs.printReplicationInfo()configured oplog size: 990MBlog 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 192.168.100.101haha:PRIMARY> use adminswitched to db adminhaha: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 192.168.100.101haha:PRIMARY> show dbs2018-04-19T12:02:57.720+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 adminswitched to db adminhaha:PRIMARY> db.auth("root","123")1haha:PRIMARY> show dbsadmin 0.000GBcloud 0.000GBconfig 0.000GBlocal 0.000GBhaha:PRIMARY> exit