时间：2021-07-01 10:21:17 帮助过：28人阅读
搭建副本集一般需要三台机器，也是三个角色，主节点、从节点、仲裁节点仲裁节点不存储数据，主从节点都存储数据。
我这里使用了一台机器，安装了三个mongodb，使用了不同的端口，分别为
192.168.0.134:27017
192.168.0.134:27018
192.168.0.134:27019
我这里使用的压缩包安装，去官网下载适合自己系统的安装包https://www.mongodb.com/download-center/community?tck=docs_server，我这里使用的是rhel4.2.6版本
tar -zxvf mongodb-linux-x86_64-rhel70-4.2.6.tgz
mv mongodb-linux-x86_64-rhel70-4.2.6 /usr/local/mongodb
然后去/usr/local/mongodb 目录里面新创建db和logs两个目录
dbpath = /usr/local/mongodb/db #数据文件存放目录
logpath = /usr/local//mongodb/logs/mongodb.log #日志文件存放目录
port = 27018 #端口
fork = true #以守护程序的方式启用，即在后台运行
replSet=rs001 # 集群名字
bind_ip=0.0.0.0
./mongod -f mongodb.conf
这样一个mongodb就完成了安装，然后把mongodb的安装目录复制一份
cp -r /usr/local/mongodb /usr/local/mongodb2
然后需要修改的文件有mongodb.conf
mongodb.conf的配置：
dbpath = /usr/local/mongodb2/db #数据文件存放目录
logpath = /usr/local//mongodb2/logs/mongodb.log #日志文件存放目录
port = 27019 #端口 （端口不能一样）
fork = true #以守护程序的方式启用，即在后台运行
最后再次启动即可。
节点1
dbpath = /usr/local/mongodb/db #数据文件存放目录
logpath = /usr/local//mongodb/logs/mongodb.log #日志文件存放目录
port = 27018 #端口
fork = true #以守护程序的方式启用，即在后台运行
replSet=rs001 # 相同的集群副本集名称要一致
bind_ip=0.0.0.0
节点二
dbpath = /usr/local/mongodb2/db #数据文件存放目录
logpath = /usr/local//mongodb2/logs/mongodb.log #日志文件存放目录
port = 27019 #端口
fork = true #以守护程序的方式启用，即在后台运行
bind_ip=0.0.0.0
replSet=rs001
节点三
dbpath = /usr/local/mongodb3/db #数据文件存放目录
logpath = /usr/local//mongodb3/logs/mongodb.log #日志文件存放目录
port = 27017 #端口
fork = true #以守护程序的方式启用，即在后台运行
bind_ip=0.0.0.0
replSet=rs001
副本集有两个模式一种是有仲裁角色的，一种是没有仲裁角色的。两者的优缺点如下：
优点: 主如果宕机，仲裁节点会选举从作为新的主 如果副本集中没有仲裁节点，那么集群的主从切换依然可以进行。缺点: 如果副本集中拥有仲裁节点，那么一旦仲裁节点挂了，集群中就不能进行主从切换了。
我这里设置的无仲裁的类型
需要先登录一个mongodb，这里我选择27017
mongo --port 27017
use admin #选择数据库
cfg={_id:"rs001",members: [
{_id:0,host:"192.168.0.134:27017"},
{_id:1,host:"192.168.0.134:27018"},
{_id:2,host:"192.168.0.134:27019"}
执行完上面的最后一条命令，提示如下：
{
"_id" : "rs001",
"members" : [
{
"_id" : 0,
"host" : "192.168.0.134:27017"
},
{
"_id" : 1,
"host" : "192.168.0.134:27018"
},
{
"_id" : 2,
"host" : "192.168.0.134:27019"
}
]
}
然后进行初始化操作
rs.initiate(cfg)
rs.initiate(cfg);
{
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1589512443, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1589512443, 1)
}
最后验证 rs.status()
rs001:SECONDARY> rs.status()
{
"set" : "rs001",
"date" : ISODate("2020-05-15T03:14:21.861Z"),
"myState" : 1,
"term" : NumberLong(1),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"heartbeatIntervalMillis" : NumberLong(2000),
"majorityVoteCount" : 2,
"writeMajorityCount" : 2,
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"lastCommittedWallTime" : ISODate("2020-05-15T03:14:15.356Z"),
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"readConcernMajorityWallTime" : ISODate("2020-05-15T03:14:15.356Z"),
"appliedOpTime" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"lastAppliedWallTime" : ISODate("2020-05-15T03:14:15.356Z"),
"lastDurableWallTime" : ISODate("2020-05-15T03:14:15.356Z")
},
"lastStableRecoveryTimestamp" : Timestamp(1589512454, 3),
"lastStableCheckpointTimestamp" : Timestamp(1589512454, 3),
"electionCandidateMetrics" : {
"lastElectionReason" : "electionTimeout",
"lastElectionDate" : ISODate("2020-05-15T03:14:14.596Z"),
"electionTerm" : NumberLong(1),
"lastCommittedOpTimeAtElection" : {
"ts" : Timestamp(0, 0),
"t" : NumberLong(-1)
},
"lastSeenOpTimeAtElection" : {
"ts" : Timestamp(1589512443, 1),
"t" : NumberLong(-1)
},
"numVotesNeeded" : 2,
"priorityAtElection" : 1,
"electionTimeoutMillis" : NumberLong(10000),
"numCatchUpOps" : NumberLong(0),
"newTermStartDate" : ISODate("2020-05-15T03:14:14.759Z"),
"wMajorityWriteAvailabilityDate" : ISODate("2020-05-15T03:14:15.344Z")
},
"members" : [
{
"_id" : 0,
"name" : "192.168.0.134:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 214,
"optime" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-05-15T03:14:15Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "could not find member to sync from",
"electionTime" : Timestamp(1589512454, 1),
"electionDate" : ISODate("2020-05-15T03:14:14Z"),
"configVersion" : 1,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "192.168.0.134:27018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 18,
"optime" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-05-15T03:14:15Z"),
"optimeDurableDate" : ISODate("2020-05-15T03:14:15Z"),
"lastHeartbeat" : ISODate("2020-05-15T03:14:20.723Z"),
"lastHeartbeatRecv" : ISODate("2020-05-15T03:14:20.237Z"),
"pingMs" : NumberLong(11),
"lastHeartbeatMessage" : "",
"syncingTo" : "192.168.0.134:27019",
"syncSourceHost" : "192.168.0.134:27019",
"syncSourceId" : 2,
"infoMessage" : "",
"configVersion" : 1
},
{
"_id" : 2,
"name" : "192.168.0.134:27019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 18,
"optime" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1589512455, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-05-15T03:14:15Z"),
"optimeDurableDate" : ISODate("2020-05-15T03:14:15Z"),
"lastHeartbeat" : ISODate("2020-05-15T03:14:20.726Z"),
"lastHeartbeatRecv" : ISODate("2020-05-15T03:14:21.346Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "192.168.0.134:27017",
"syncSourceHost" : "192.168.0.134:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 1
}
],
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1589512455, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1589512455, 1)
}
cfg={_id:"rs001",members: [
{_id:0,host:"192.168.0.134:27017",priority:2},
{_id:1,host:"192.168.0.134:27018",priority:1},
{_id:2,host:"192.168.0.134:27019",arbiterOnly:true}
]}
其余配置都不变。
登录到主上面，建立一个新集合
use mydb
db.acc.insert({AccountID:1,UserName:"123",password:"123456"})
show tables
然后登录到从上面去查看
mongo --port 27018
show dbs 查看数据库
admin 0.000GB
config 0.000GB
local 0.000GB
mydb 0.000GB
查看表acc是否存在
use mydb
show tables
如果show dbs的时候报错，需要执行rs.slaveOk()即可。
mongodb 副本集搭建
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