MongoDB中怎么实现副本集

MongoDB中怎么实现副本集，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。 1、环境

2、分别在3个节点安装配置和启动MongoDB
[root@D2-POMS15 ~]# rpm -qa | grep openssl
openssl098e-0.9.8e-17.el6_2.2.x86_64
openssl-1.0.1e-15.el6.x86_64
[root@D2-POMS15 ~]# mkdir /usr/local/mongodb
[root@D2-POMS15 ~]# tar -xvzf mongodb-linux-x86_64-rhel62-3.4.7.tgz
[root@D2-POMS15 ~]# mv mongodb-linux-x86_64-rhel62-3.4.7/* /usr/local/mongodb/
[root@D2-POMS15 ~]# vim .bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH=$PATH:/usr/local/mongodb/bin/
export PATH
[root@D2-POMS15 ~]# . .bash_profile
[root@D2-POMS15 ~]# mkdir /usr/local/mongodb/db
[root@D2-POMS15 ~]# mkdir /usr/local/mongodb/log
[root@D2-POMS15 ~]# touch /usr/local/mongodb/log/mongodb.log
[root@D2-POMS15 ~]# vim /usr/local/mongodb/mongodb.conf
dbpath=/usr/local/mongodb/db
logpath=/usr/local/mongodb/log/mongodb.log
logappend=true
noauth=true
port=27017
fork=true
replSet=stoners
[root@D2-POMS15 ~]# mongod -f /usr/local/mongodb/mongodb.conf
about to fork child process, waiting until server is ready for connections.
forked process: 11580
child process started successfully, parent exiting
[root@D2-POMS15 ~]# mongo
MongoDB shell version v3.4.7
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.7
Welcome to the MongoDB shell.

[root@D2-POMS15 ~]# mongod -f /usr/local/mongodb/mongodb.conf
[root@D2-POMS16 ~]# mongod -f /usr/local/mongodb/mongodb.conf
[root@D2-POMS17 ~]# mongod -f /usr/local/mongodb/mongodb.conf

3、在任一节点进行副本集配置
初始化副本集配置。
语法：
{
_id : ,
members : [
{_id : 0, host : },
{_id : 1, host : },
{_id : 2, host : },
]
}
配置其中一个节点为仲裁的语法：
{
_id : “my_replica_set”,
members : [
{_id : 0, host : “rs1.example.net:27017”},
{_id : 1, host : “rs2.example.net:27017”},
{_id : 2, host : “rs3.example.net”, arbiterOnly: true},
]
}

> rs.initiate({_id:”stoners”,members:[{_id:0,host:”10.163.97.15:27017″}]})
{ “ok” : 1 }
stoners:SECONDARY> rs.conf()
{
“_id” : “stoners”,
“version” : 1,
“protocolVersion” : NumberLong(1),
“members” : [
{
“_id” : 0,
“host” : “10.163.97.15:27017”,
“arbiterOnly” : false,
“buildIndexes” : true,
“hidden” : false,
“priority” : 1,
“tags” : {

},
“slaveDelay” : NumberLong(0),
“votes” : 1
}
],
“settings” : {
“chainingAllowed” : true,
“heartbeatIntervalMillis” : 2000,
“heartbeatTimeoutSecs” : 10,
“electionTimeoutMillis” : 10000,
“catchUpTimeoutMillis” : 60000,
“getLastErrorModes” : {

},
“getLastErrorDefaults” : {
“w” : 1,
“wtimeout” : 0
},
“replicaSetId” : ObjectId(“5996b49a33625594149428f2”)
}
}

添加节点：
stoners:PRIMARY> rs.add(“10.163.97.16”)
{ “ok” : 1 }
stoners:PRIMARY> rs.add(“10.163.97.17”)
{ “ok” : 1 }

查看状态：
stoners:PRIMARY> rs.status()
{
“set” : “stoners”,
“date” : ISODate(“2017-08-18T09:49:18.307Z”),
“myState” : 1,
“term” : NumberLong(1),
“heartbeatIntervalMillis” : NumberLong(2000),
“optimes” : {
“lastCommittedOpTime” : {
“ts” : Timestamp(1503049755, 1),
“t” : NumberLong(1)
},
“appliedOpTime” : {
“ts” : Timestamp(1503049755, 1),
“t” : NumberLong(1)
},
“durableOpTime” : {
“ts” : Timestamp(1503049755, 1),
“t” : NumberLong(1)
}
},
“members” : [
{
“_id” : 0,
“name” : “10.163.97.15:27017”,
“health” : 1,
“state” : 1,
“stateStr” : “PRIMARY”,
“uptime” : 144,
“optime” : {
“ts” : Timestamp(1503049755, 1),
“t” : NumberLong(1)
},
“optimeDate” : ISODate(“2017-08-18T09:49:15Z”),
“infoMessage” : “could not find member to sync from”,
“electionTime” : Timestamp(1503049643, 2),
“electionDate” : ISODate(“2017-08-18T09:47:23Z”),
“configVersion” : 3,
“self” : true
},
{
“_id” : 1,
“name” : “10.163.97.16:27017”,
“health” : 1,
“state” : 2,
“stateStr” : “SECONDARY”,
“uptime” : 86,
“optime” : {
“ts” : Timestamp(1503049755, 1),
“t” : NumberLong(1)
},
“optimeDurable” : {
“ts” : Timestamp(1503049755, 1),
“t” : NumberLong(1)
},
“optimeDate” : ISODate(“2017-08-18T09:49:15Z”),
“optimeDurableDate” : ISODate(“2017-08-18T09:49:15Z”),
“lastHeartbeat” : ISODate(“2017-08-18T09:49:17.787Z”),
“lastHeartbeatRecv” : ISODate(“2017-08-18T09:49:16.774Z”),
“pingMs” : NumberLong(0),
“syncingTo” : “10.163.97.15:27017”,
“configVersion” : 3
},
{
“_id” : 2,
“name” : “10.163.97.17:27017”,
“health” : 1,
“state” : 2,
“stateStr” : “SECONDARY”,
“uptime” : 52,
“optime” : {
“ts” : Timestamp(1503049755, 1),
“t” : NumberLong(1)
},
“optimeDurable” : {
“ts” : Timestamp(1503049755, 1),
“t” : NumberLong(1)
},
“optimeDate” : ISODate(“2017-08-18T09:49:15Z”),
“optimeDurableDate” : ISODate(“2017-08-18T09:49:15Z”),
“lastHeartbeat” : ISODate(“2017-08-18T09:49:17.787Z”),
“lastHeartbeatRecv” : ISODate(“2017-08-18T09:49:16.883Z”),
“pingMs” : NumberLong(0),
“syncingTo” : “10.163.97.15:27017”,
“configVersion” : 3
}
],
“ok” : 1
}

4、测试数据写入
主节点写入数据：
stoners:PRIMARY> use hr
switched to db hr
stoners:PRIMARY> db.emp.insert({“num”:1})
WriteResult({ “nInserted” : 1 })
stoners:PRIMARY> db.emp.find();
{ “_id” : ObjectId(“5996b96ca4ca3f4911a83ae8”), “num” : 1 }

直接查询副本节点报错：
stoners:SECONDARY> use hr
switched to db hr
stoners:SECONDARY> db.emp.find();
Error: error: {
“ok” : 0,
“errmsg” : “not master and slaveOk=false”,
“code” : 13435,
“codeName” : “NotMasterNoSlaveOk”
}

设置副本节点可读：
stoners:SECONDARY> db.getMongo().setSlaveOk();
stoners:SECONDARY> db.emp.find();
{ “_id” : ObjectId(“5996b96ca4ca3f4911a83ae8”), “num” : 1 }

另一个副本节点：
stoners:SECONDARY> db.getMongo().setSlaveOk();
stoners:SECONDARY> use hr
switched to db hr
stoners:SECONDARY> db.emp.find();
{ “_id” : ObjectId(“5996b96ca4ca3f4911a83ae8”), “num” : 1 }

5、测试故障切换
先关闭主节点：
stoners:PRIMARY> use admin
switched to db admin
stoners:PRIMARY> db.shutdownServer();
server should be down…

其中一个副本节点变为了主节点：
stoners:SECONDARY>
stoners:PRIMARY>
stoners:PRIMARY> rs.status()
{
“set” : “stoners”,
“date” : ISODate(“2017-08-18T10:03:49.050Z”),
“myState” : 1,
“term” : NumberLong(2),
“heartbeatIntervalMillis” : NumberLong(2000),
“optimes” : {
“lastCommittedOpTime” : {
“ts” : Timestamp(1503050624, 1),
“t” : NumberLong(2)
},
“appliedOpTime” : {
“ts” : Timestamp(1503050624, 1),
“t” : NumberLong(2)
},
“durableOpTime” : {
“ts” : Timestamp(1503050624, 1),
“t” : NumberLong(2)
}
},
“members” : [
{
“_id” : 0,
“name” : “10.163.97.15:27017”,
“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(“2017-08-18T10:03:47.314Z”),
“lastHeartbeatRecv” : ISODate(“2017-08-18T10:01:03.792Z”),
“pingMs” : NumberLong(0),
“lastHeartbeatMessage” : “Connection refused”,
“configVersion” : -1
},
{
“_id” : 1,
“name” : “10.163.97.16:27017”,
“health” : 1,
“state” : 1,
“stateStr” : “PRIMARY”,
“uptime” : 929,
“optime” : {
“ts” : Timestamp(1503050624, 1),
“t” : NumberLong(2)
},
“optimeDate” : ISODate(“2017-08-18T10:03:44Z”),
“electionTime” : Timestamp(1503050473, 1),
“electionDate” : ISODate(“2017-08-18T10:01:13Z”),
“configVersion” : 3,
“self” : true
},
{
“_id” : 2,
“name” : “10.163.97.17:27017”,
“health” : 1,
“state” : 2,
“stateStr” : “SECONDARY”,
“uptime” : 845,
“optime” : {
“ts” : Timestamp(1503050624, 1),
“t” : NumberLong(2)
},
“optimeDurable” : {
“ts” : Timestamp(1503050624, 1),
“t” : NumberLong(2)
},
“optimeDate” : ISODate(“2017-08-18T10:03:44Z”),
“optimeDurableDate” : ISODate(“2017-08-18T10:03:44Z”),
“lastHeartbeat” : ISODate(“2017-08-18T10:03:47.252Z”),
“lastHeartbeatRecv” : ISODate(“2017-08-18T10:03:47.998Z”),
“pingMs” : NumberLong(0),
“syncingTo” : “10.163.97.16:27017”,
“configVersion” : 3
}
],
“ok” : 1
}

在主节点插入数据：
stoners:PRIMARY> use hr
switched to db hr
stoners:PRIMARY> db.emp.insert({“num”:2})
WriteResult({ “nInserted” : 1 })
stoners:PRIMARY> db.emp.find();
{ “_id” : ObjectId(“5996b96ca4ca3f4911a83ae8”), “num” : 1 }
{ “_id” : ObjectId(“5996bbcb5945237d11f3052d”), “num” : 2 }

在另一个副本节点查看：
stoners:SECONDARY> use hr
switched to db hr
stoners:SECONDARY> db.emp.find();
{ “_id” : ObjectId(“5996b96ca4ca3f4911a83ae8”), “num” : 1 }
{ “_id” : ObjectId(“5996bbcb5945237d11f3052d”), “num” : 2 }

现在启动关闭的节点：
[root@D2-POMS15 ~]# mongod -f /usr/local/mongodb/mongodb.conf
启动后自动成为副本节点：
stoners:SECONDARY> rs.status()
{
“set” : “stoners”,
“date” : ISODate(“2017-08-18T10:08:25.401Z”),
“myState” : 2,
“term” : NumberLong(2),
“syncingTo” : “10.163.97.17:27017”,
“heartbeatIntervalMillis” : NumberLong(2000),
“optimes” : {
“lastCommittedOpTime” : {
“ts” : Timestamp(1503050974, 1),
“t” : NumberLong(2)
},
“appliedOpTime” : {
“ts” : Timestamp(1503050974, 1),
“t” : NumberLong(2)
},
“durableOpTime” : {
“ts” : Timestamp(1503050974, 1),
“t” : NumberLong(2)
}
},
“members” : [
{
“_id” : 0,
“name” : “10.163.97.15:27017”,
“health” : 1,
“state” : 2,
“stateStr” : “SECONDARY”,
“uptime” : 49,
“optime” : {
“ts” : Timestamp(1503050974, 1),
“t” : NumberLong(2)
},
“optimeDate” : ISODate(“2017-08-18T10:09:34Z”),
“syncingTo” : “10.163.97.17:27017”,
“configVersion” : 3,
“self” : true
},
{
“_id” : 1,
“name” : “10.163.97.16:27017”,
“health” : 1,
“state” : 1,
“stateStr” : “PRIMARY”,
“uptime” : 48,
“optime” : {
“ts” : Timestamp(1503050974, 1),
“t” : NumberLong(2)
},
“optimeDurable” : {
“ts” : Timestamp(1503050974, 1),
“t” : NumberLong(2)
},
“optimeDate” : ISODate(“2017-08-18T10:09:34Z”),
“optimeDurableDate” : ISODate(“2017-08-18T10:09:34Z”),
“lastHeartbeat” : ISODate(“2017-08-18T10:08:24.973Z”),
“lastHeartbeatRecv” : ISODate(“2017-08-18T10:08:23.753Z”),
“pingMs” : NumberLong(0),
“electionTime” : Timestamp(1503050473, 1),
“electionDate” : ISODate(“2017-08-18T10:01:13Z”),
“configVersion” : 3
},
{
“_id” : 2,
“name” : “10.163.97.17:27017”,
“health” : 1,
“state” : 2,
“stateStr” : “SECONDARY”,
“uptime” : 48,
“optime” : {
“ts” : Timestamp(1503050974, 1),
“t” : NumberLong(2)
},
“optimeDurable” : {
“ts” : Timestamp(1503050974, 1),
“t” : NumberLong(2)
},
“optimeDate” : ISODate(“2017-08-18T10:09:34Z”),
“optimeDurableDate” : ISODate(“2017-08-18T10:09:34Z”),
“lastHeartbeat” : ISODate(“2017-08-18T10:08:24.973Z”),
“lastHeartbeatRecv” : ISODate(“2017-08-18T10:08:23.520Z”),
“pingMs” : NumberLong(0),
“syncingTo” : “10.163.97.16:27017”,
“configVersion” : 3
}
],
“ok” : 1
}

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH=$PATH:/usr/local/mongodb/bin/
export PATH
[root@D2-POMS15 ~]# . .bash_profile
[root@D2-POMS15 ~]# mkdir /usr/local/mongodb/db
[root@D2-POMS15 ~]# mkdir /u免费云主机域名sr/local/mongodb/log
[root@D2-POMS15 ~]# touch /usr/local/mongodb/log/mongodb.log
[root@D2-POMS15 ~]# vim /usr/local/mongodb/mongodb.conf
dbpath=/usr/local/mongodb/db
logpath=/usr/local/mongodb/log/mongodb.log
logappend=true
noauth=true
port=27017
fork=true
replSet=stoners
[root@D2-POMS15 ~]# mongod -f /usr/local/mongodb/mongodb.conf
about to fork child process, waiting until server is ready for connections.
forked process: 11580
child process started successfully, parent exiting
[root@D2-POMS15 ~]# mongo
MongoDB shell version v3.4.7
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.7
Welcome to the MongoDB shell.

[root@D2-POMS15 ~]# mongod -f /usr/local/mongodb/mongodb.conf
[root@D2-POMS16 ~]# mongod -f /usr/local/mongodb/mongodb.conf
[root@D2-POMS17 ~]# mongod -f /usr/local/mongodb/mongodb.conf

},
“getLastErrorDefaults” : {
“w” : 1,
“wtimeout” : 0
},
“replicaSetId” : ObjectId(“5996b49a33625594149428f2”)
}
}

添加节点：
stoners:PRIMARY> rs.add(“10.163.97.16”)
{ “ok” : 1 }
stoners:PRIMARY> rs.add(“10.163.97.17”)
{ “ok” : 1 }

设置副本节点可读：
stoners:SECONDARY> db.getMongo().setSlaveOk();
stoners:SECONDARY> db.emp.find();
{ “_id” : ObjectId(“5996b96ca4ca3f4911a83ae8”), “num” : 1 }

5、测试故障切换
先关闭主节点：
stoners:PRIMARY> use admin
switched to db admin
stoners:PRIMARY> db.shutdownServer();
server should be down…

数据也同步过来了。
stoners:SECONDARY> db.getMongo().setSlaveOk();
stoners:SECONDARY> use hr
switched to db hr
stoners:SECONDARY> db.emp.find();
{ “_id” : ObjectId(“5996b96ca4ca3f4911a83ae8”), “num” : 1 }
{ “_id” : ObjectId(“5996bbcb5945237d11f3052d”), “num” : 2 }关于MongoDB中怎么实现副本集问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注百云行业资讯频道了解更多相关知识。

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