mongodb3.2replicasets-创新互联
一、配置文件 /etc/mongod.conf
注意：arbiter.conf文件的属主、属组为mongod
二、启动服务，配置副本集
service mongod start /data/mongodb/startaribiter.sh启动第二个节点，然后在primary上操作如下：
rs.initiate() rs.add("mongodb2.example.net") rs.add("mongodb3.example.net") rs.addArb("mongodb1.example.net:27029")如果希望降低primary的优先级：
cfg = rs.conf() cfg.members[2].priority = 0.5 rs.reconfig(cfg) rs.status()实现复制后，在从节点上查看数据如下：
SECONDARY> rs.slaveOk() SECONDARY> show collections三、 使用keyFile实现复制验证
在主节点上创建群集用户及密码如下：
admin = db.getSiblingDB("admin") admin.createUser( { user: “clusteradmin”, pwd: “clusterpwd”, roles: [ { role: "userAdminAnyDatabase", db: "admin" }, { role: “clusterAdmin”, db: "admin" }, { role: “root”, db: "admin" } ] } )测试用户：
db.getSiblingDB("admin").auth(“clusteradmin”, “clusterpwd” )在各从节点上关闭服务：
use admin
db.shutdownServer()
包括arbiter节点也要关闭服务，最后再关闭primary节点的服务。
在各配置文件mongod.conf文件中添加auth相关的文件，配置如下所示：
security: keyFile: /data/mongodb/conf/keyfile.key [root@mongo01 ~]# cat /data/mongodb/conf/keyfile.key abcdefgh 该文件的权限必须是600或400，并把该文件复制到各节点上（保持内容相同），该文件也可以使用以下命令生成： openssl rand -base64 755 > path-to-keyfile最后再新启动各节点的mongodb服务，并重新login，测试。
参考：
https://docs.mongodb.com/manual/tutorial/deploy-replica-set/
https://docs.mongodb.com/manual/tutorial/enforce-keyfile-access-control-in-existing-replica-set/
四、补充 CentOS7上部署mongodb 3.6的 RS
(1) 在vm2主机上配置mongod如下所示：
[root@vm2 ~]# mkdir -p /data/mongodb/{conf,run,logs,data} [root@vm2 ~]# chown -R mongod.mongod /data/mongodb [root@vm2 ~]# vim /etc/mongod.conf [root@vm2 ~]# grep -Pv "^(#|$)" /etc/mongod.conf systemLog: destination: file logAppend: true path: /data/mongodb/logs/mongod.log storage: dbPath: /data/mongodb/data/ directoryPerDB: true journal: enabled: true processManagement: fork: true # fork and run in background pidFilePath: /data/mongodb/run/mongod.pid # location of pidfile timeZoneInfo: /usr/share/zoneinfo net: port: 27027 bindIp: 0.0.0.0 # Listen to local interface only, comment to listen on all interfaces. security: authorization: enabled keyFile: /data/mongodb/conf/keyFile replication: replSetName: rs0 [root@vm2 ~]# 注：必须保证 mongod.conf文件与mongod.service文件中的各路径设置一致，否则会导致启动失败 [root@vm2 ~]# cd /usr/lib/systemd/system/ [root@vm2 system]# head -15 mongod.service [Unit] Description=High-performance, schema-free document-oriented database After=network.target Documentation=https://docs.mongodb.org/manual [Service] User=mongod Group=mongod Environment="OPTIONS=-f /etc/mongod.conf" ExecStart=/usr/bin/mongod $OPTIONS ExecStartPre=/usr/bin/mkdir -p /data/mongodb/run ExecStartPre=/usr/bin/chown mongod:mongod /data/mongodb/run ExecStartPre=/usr/bin/chmod 0755 /data/mongodb/run PermissionsStartOnly=true PIDFile=/data/mongodb/run/mongod.pid [root@vm2 system]# [root@vm2 ~]# openssl rand -base64 755 > /data/mongodb/conf/keyFile [root@vm2 ~]# chown mongod.mongod /data/mongodb/conf/keyFile [root@vm2 ~]# chmod 400 /data/mongodb/conf/keyFile（2）在vm2主机上配置arbiter 如下所示：
[root@vm2 data]# mkdir arbiter/{conf,data,logs,run} -p [root@vm2 data]# cp mongodb/conf/keyFile arbiter/conf/ [root@vm2 data]# chmod 400 /data/arbiter/conf/ [root@vm2 data]# cp /etc/mongod.conf arbiter/conf/ [root@vm2 data]# mv conf/mongod.conf conf/arbiter.conf [root@vm2 data]# vim arbiter/conf/arbiter.conf [root@vm2 data]# chown -R mongod.mongod arbiter [root@vm2 data]# grep -Pv "^(#|$)" arbiter/conf/arbiter.conf systemLog: destination: file logAppend: true path: /data/arbiter/logs/arbiter.log storage: dbPath: /data/arbiter/data/ directoryPerDB: true journal: enabled: true processManagement: fork: true # fork and run in background pidFilePath: /data/arbiter/run/arbiter.pid # location of pidfile timeZoneInfo: /usr/share/zoneinfo net: port: 37027 bindIp: 0.0.0.0 # Listen to local interface only, comment to listen on all interfaces. security: authorization: enabled keyFile: /data/arbiter/conf/keyFile replication: replSetName: rs0 [root@vm2 data]# [root@vm2 data]# cd /usr/lib/systemd/system [root@vm2 system]# cp mongod.service arbiter.service [root@vm2 system]# vim arbiter.service [root@vm2 system]# head -15 arbiter.service [Unit] Description=High-performance, schema-free document-oriented database After=network.target Documentation=https://docs.mongodb.org/manual [Service] User=mongod Group=mongod Environment="OPTIONS=-f /data/arbiter/conf/arbiter.conf" ExecStart=/usr/bin/mongod $OPTIONS ExecStartPre=/usr/bin/mkdir -p /data/arbiter/run ExecStartPre=/usr/bin/chown mongod:mongod /data/arbiter/run ExecStartPre=/usr/bin/chmod 0755 /data/arbiter/run PermissionsStartOnly=true PIDFile=/data/arbiter/run/arbiter.pid [root@vm2 system]# [root@vm2 system]# systemctl daemon-reload [root@vm2 arbiter]# tree . ├── conf │ ├── arbiter.conf │ └── keyFile ├── data ├── logs └── run 4 directories, 2 files [root@vm2 arbiter]# [root@vm2 data]# echo never > /sys/kernel/mm/transparent_hugepage/enabled [root@vm2 data]# systemctl restart mongod [root@vm2 data]# systemctl restart arbiter [root@vm2 data]# ps -ef | grep mongod mongod 130256 1 8 12:46 ? 00:00:01 /usr/bin/mongod -f /etc/mongod.conf mongod 130354 1 14 12:46 ? 00:00:01 /usr/bin/mongod -f /data/arbiter/conf/arbiter.conf root 130387 125564 0 12:46 pts/0 00:00:00 grep --color=auto mongod [root@vm2 data]#（3）在另一台mongodb server上安装并配置mongodb，配置内容与vm2上完全相同。然后添加rs，操作如下：
[root@meteor ~]# cat /sys/kernel/mm/transparent_hugepage/enabled [always] madvise never [root@meteor ~]# echo never > /sys/kernel/mm/transparent_hugepage/enabled [root@meteor ~]# systemctl restart mongod [root@meteor ~]# mongo localhost:27027/admin -uroot -p MongoDB shell version v3.6.5 Enter password: connecting to: mongodb://localhost:27027/admin MongoDB server version: 3.6.5 > show dbs 2018-05-26T20:41:42.392+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:849:19 shellHelper@src/mongo/shell/utils.js:739:15 @(shellhelp2):1:1 > rs.slaveOk() > 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" } > config={"_id":"rs0","members":[ ... {"_id":0,"host":"192.168.20.221:27027","priority":100}, ... {"_id":1,"host":"192.168.40.206:27027","priority":1}, ... {"_id":2,"host":"192.168.40.206:37027","priority":0,"arbiterOnly":true} ... ] } { "_id" : "rs0", "members" : [ { "_id" : 0, "host" : "192.168.20.221:27027", "priority" : 100 }, { "_id" : 1, "host" : "192.168.40.206:27027", "priority" : 1 }, { "_id" : 2, "host" : "192.168.40.206:37027", "priority" : 0, "arbiterOnly" : true } ] } > rs.initiate(config) { "ok" : 1 } rs0:SECONDARY> rs0:SECONDARY> rs0:PRIMARY> rs0:PRIMARY> rs.status() { "set" : "rs0", "date" : ISODate("2018-05-26T12:49:29.987Z"), "myState" : 1, "term" : NumberLong(1), "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1527338963, 1), "t" : NumberLong(1) }, "readConcernMajorityOpTime" : { "ts" : Timestamp(1527338963, 1), "t" : NumberLong(1) }, "appliedOpTime" : { "ts" : Timestamp(1527338963, 1), "t" : NumberLong(1) }, "durableOpTime" : { "ts" : Timestamp(1527338963, 1), "t" : NumberLong(1) } }, "members" : [ { "_id" : 0, "name" : "192.168.20.221:27027", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 503, "optime" : { "ts" : Timestamp(1527338963, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-05-26T12:49:23Z"), "infoMessage" : "could not find member to sync from", "electionTime" : Timestamp(1527338942, 1), "electionDate" : ISODate("2018-05-26T12:49:02Z"), "configVersion" : 1, "self" : true }, { "_id" : 1, "name" : "192.168.40.206:27027", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 38, "optime" : { "ts" : Timestamp(1527338963, 1), "t" : NumberLong(1) }, "optimeDurable" : { "ts" : Timestamp(1527338963, 1), "t" : NumberLong(1) }, "optimeDate" : ISODate("2018-05-26T12:49:23Z"), "optimeDurableDate" : ISODate("2018-05-26T12:49:23Z"), "lastHeartbeat" : ISODate("2018-05-26T12:49:28.268Z"), "lastHeartbeatRecv" : ISODate("2018-05-26T12:49:28.274Z"), "pingMs" : NumberLong(1), "syncingTo" : "192.168.20.221:27027", "configVersion" : 1 }, { "_id" : 2, "name" : "192.168.40.206:37027", "health" : 1, "state" : 7, "stateStr" : "ARBITER", "uptime" : 38, "lastHeartbeat" : ISODate("2018-05-26T12:49:28.266Z"), "lastHeartbeatRecv" : ISODate("2018-05-26T12:49:29.107Z"), "pingMs" : NumberLong(1), "configVersion" : 1 } ], "ok" : 1, "operationTime" : Timestamp(1527338963, 1), "$clusterTime" : { "clusterTime" : Timestamp(1527338963, 1), "signature" : { "hash" : BinData(0,"xxW1WBNE99FOs8BNdAanWKOhFUk="), "keyId" : NumberLong("6559870810092208129") } } } rs0:PRIMARY>（4）在secondary节点上登录，并查看状态，验证数据一致性。
说明：
priority：表示一个成员被选举为Primary节点的优先级，默认值是1，取值范围是从0到100，将priority设置为0有特殊含义：Priority为0的成员永远不能成为Primary 节点。Replica Set中，Priority高的成员，会优先被选举为Primary 节点，只要其满足条件。
hidden：将成员配置为隐藏成员，要求Priority 为0。Client不会向隐藏成员发送请求，因此隐藏成员不会收到Client的Request。
slaveDelay：单位是秒，将Secondary 成员配置为延迟备份节点，要求Priority 为0，表示该成员比Primary 成员滞后指定的时间，才能将Primary上进行的写操作同步到本地。为了数据读取的一致性，应将延迟备份节点的hidden设置为true，避免用户读取到明显滞后的数据。Delayed members maintain a copy of the data that reflects the state of the data at some time in the past.
votes：有效值是0或1，默认值是1，如果votes是1，表示该成员（voting member）有权限选举Primary 成员。在一个Replica Set中，最多有7个成员，其votes 属性的值是1。
arbiterOnly：表示该成员是仲裁者，arbiter的唯一作用是就是参与选举，其votes属性是1，arbiter不保存数据，也不会为client提供服务。
总结：本内容前半部分是使用rs.add("....")的方法添加副本集，而后半部分是使用 先定义config ，然后再 rs.initiate(config)的方法 添加副本集。各位朋友可根据需要各自选用不同的方法
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