详解mongodb搭建Replica Set的方法
1.创建数据文件夹：
mkdir-p/data/master mkdir-p/data/slaver mkdir-p/data/arbiter
效果：
data文件夹包含arbiter master slaver三个文件夹
2.创建日志存放文件
vi/log/master.log vi/log/slaver.log vi/log/arbiter.log
效果：
log文件夹包含master.log slaver.log arbiter.log三个文件（注意，data文件夹和lon文件夹均无上级文件夹，可自行创建不同名称不同位置的文件夹，注意路径与下文中的配置文件一致即可）
3.创建配置文件
在第一步创建的三个文件中创建文件夹同名.conf后缀文件，即：master文件夹中应有master.conf文件，slaver文件夹中应有slaver.conf文件，arbiter文件夹中应有arbiter.conf文件。
各配置文件内容如下：
master.conf
dbpath=/data/master logpath=/log/master.log pidfilepath=/data/master.pid directoryperdb=true logappend=true replSet=away bind_ip=localhost port=27018 #fork=true
slaver.conf
dbpath=/data/slaver logpath=/log/slaver.log pidfilepath=/data/slaver.pid directoryperdb=true logappend=true replSet=away bind_ip=localhost port=27019 #fork=true
arbiter.conf
dbpath=/data/arbiter logpath=/log/arbiter.log pidfilepath=arbiter.pid directoryperdb=true logappend=true replSet=away bind_ip=localhost port=27020 #fork=true
replSet、bind_ip、port三个属性可根据自己情况进行更改。
属性大致解释如下：
dbpath：数据存放目录
logpath：日志存放路径
pidfilepath：进程文件，方便停止mongodb
directoryperdb：为每一个数据库按照数据库名建立文件夹存放
logappend：以追加的方式记录日志
replSet：replicaset的名字
bind_ip：mongodb所绑定的ip地址
port：mongodb进程所使用的端口号，默认为27017
oplogSize：mongodb操作日志文件的最大大小。单位为Mb，默认为硬盘剩余空间的5%
fork：以后台方式运行进程
noprealloc：不预先分配存储
4.启动mongod程序
mongod--config<配置路径>
例如：
lhd@lhd:~$sudomongod--config/data/master/master.conf [sudo]lhd的密码：
输入密码即可，此出应注意启动权限。
5.主从配置
1).启动mongo客户端：
mongolocalhost:27018
运行结果如下：
mongolocalhost:27018
MongoDBshellversionv4.4.2
connectingto:mongodb://localhost:27018/test?compressors=disabled&gssapiServiceName=mongodb
Implicitsession:session{"id":UUID("0078e025-5485-4967-85c8-160755ac3d58")}
MongoDBserverversion:4.4.2
---
Theservergeneratedthesestartupwarningswhenbooting:
2020-12-22T09:39:40.347+08:00:UsingtheXFSfilesystemisstronglyrecommendedwiththeWiredTigerstorageengine.Seehttp://dochub.mongodb.org/core/prodnotes-filesystem
2020-12-22T09:39:41.093+08:00:Accesscontrolisnotenabledforthedatabase.Readandwriteaccesstodataandconfigurationisunrestricted
2020-12-22T09:39:41.094+08:00:Youarerunningthisprocessastherootuser,whichisnotrecommended
2020-12-22T09:39:41.095+08:00:Softrlimitstoolow
2020-12-22T09:39:41.095+08:00: currentValue:1024
2020-12-22T09:39:41.095+08:00: recommendedMinimum:64000
---
---
EnableMongoDB'sfreecloud-basedmonitoringservice,whichwillthenreceiveanddisplay
metricsaboutyourdeployment(diskutilization,CPU,operationstatistics,etc).
ThemonitoringdatawillbeavailableonaMongoDBwebsitewithauniqueURLaccessibletoyou
andanyoneyousharetheURLwith.MongoDBmayusethisinformationtomakeproduct
improvementsandtosuggestMongoDBproductsanddeploymentoptionstoyou.
Toenablefreemonitoring,runthefollowingcommand:db.enableFreeMonitoring()
Topermanentlydisablethisreminder,runthefollowingcommand:db.disableFreeMonitoring()
---
2).设置主，从，仲裁点
useadmin switchedtodbadmin
zjd={_id:"one",members:[{_id:0,host:"localhost:27018",priority:2},{_id:1,host:"localhost:27019",priority:1},{_id:2,host:"localhost:27020",arbiterOnly:true}]};
zjd是可以任意的名字，不要用mongodb的关键字，conf，config都可以。
第一个_id表示replicaset的名字，这个数据必须和第三步配置文件中的replicaset一致，不然会报错。
members里包含的是所有节点的地址以及优先级，优先级最高的即成为主节点，值为0则不会参加选举成为主节点，对于仲裁节点，需要有个特别的配置——arbiterOnly:true。这个千万不能少了，不然主备模式就不能生效。
配置的生效时间根据不同的机器配置会有长有短，配置不错的话基本上十几秒内就能生效，有的配置需要一两分钟。
3).使配置生效
rs.initiate(zjd)
显示：
{
"operationTime":Timestamp(0,0),
"ok":0,
"errmsg":"Rejectinginitiatewithasetnamethatdiffersfromcommandlinesetname,initiatesetname:one,commandlinesetname:away",
"code":93,
"codeName":"InvalidReplicaSetConfig",
"$clusterTime":{
"clusterTime":Timestamp(0,0),
"signature":{
"hash":BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId":NumberLong(0)
}
}
}
4).查看状态
>rs.status()
显示：
{
"set":"away",
"date":ISODate("2020-12-22T02:07:27.058Z"),
"myState":2,
"term":NumberLong(0),
"syncSourceHost":"",
"syncSourceId":-1,
"heartbeatIntervalMillis":NumberLong(2000),
"majorityVoteCount":2,
"writeMajorityCount":2,
"votingMembersCount":3,
"writableVotingMembersCount":2,
"optimes":{
"lastCommittedOpTime":{
"ts":Timestamp(0,0),
"t":NumberLong(-1)
},
"lastCommittedWallTime":ISODate("1970-01-01T00:00:00Z"),
"appliedOpTime":{
"ts":Timestamp(1608602837,1),
"t":NumberLong(-1)
},
"durableOpTime":{
"ts":Timestamp(1608602837,1),
"t":NumberLong(-1)
},
"lastAppliedWallTime":ISODate("2020-12-22T02:07:17.467Z"),
"lastDurableWallTime":ISODate("2020-12-22T02:07:17.467Z")
},
"lastStableRecoveryTimestamp":Timestamp(0,0),
"members":[
{
"_id":0,
"name":"localhost:27018",
"health":1,
"state":2,
"stateStr":"SECONDARY",
"uptime":1667,
"optime":{
"ts":Timestamp(1608602837,1),
"t":NumberLong(-1)
},
"optimeDate":ISODate("2020-12-22T02:07:17Z"),
"syncSourceHost":"",
"syncSourceId":-1,
"infoMessage":"Couldnotfindmembertosyncfrom",
"configVersion":1,
"configTerm":0,
"self":true,
"lastHeartbeatMessage":""
},
{
"_id":1,
"name":"localhost:27019",
"health":1,
"state":2,
"stateStr":"SECONDARY",
"uptime":9,
"optime":{
"ts":Timestamp(1608602837,1),
"t":NumberLong(-1)
},
"optimeDurable":{
"ts":Timestamp(1608602837,1),
"t":NumberLong(-1)
},
"optimeDate":ISODate("2020-12-22T02:07:17Z"),
"optimeDurableDate":ISODate("2020-12-22T02:07:17Z"),
"lastHeartbeat":ISODate("2020-12-22T02:07:26.714Z"),
"lastHeartbeatRecv":ISODate("2020-12-22T02:07:26.768Z"),
"pingMs":NumberLong(0),
"lastHeartbeatMessage":"",
"syncSourceHost":"",
"syncSourceId":-1,
"infoMessage":"",
"configVersion":1,
"configTerm":0
},
{
"_id":2,
"name":"localhost:27020",
"health":1,
"state":7,
"stateStr":"ARBITER",
"uptime":9,
"lastHeartbeat":ISODate("2020-12-22T02:07:26.713Z"),
"lastHeartbeatRecv":ISODate("2020-12-22T02:07:25.991Z"),
"pingMs":NumberLong(0),
"lastHeartbeatMessage":"",
"syncSourceHost":"",
"syncSourceId":-1,
"infoMessage":"",
"configVersion":1,
"configTerm":0
}
],
"ok":1,
"$clusterTime":{
"clusterTime":Timestamp(1608602837,1),
"signature":{
"hash":BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId":NumberLong(0)
}
},
"operationTime":Timestamp(1608602837,1)
}
配置完成！
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