在本地机器上运行3个实例来搭建一个最简单的复制集。
准备
- 安装最新的 MongoDB 版本
- Windows 系统请事先配置好 MongoDB 可执行文件的环境变量
- Linux 和 Mac 系统请配置 PATH 变量
- 确保有 10GB 以上的硬盘空间
创建数据目录
-
MongoDB 启动时将使用一个数据目录存放所有数据文件。我们将为3个复制集节 点创建各自的数据目录。
-
Linux/MacOS:
mkdir -p ~/data/db{1,2,3}
准备配置文件
复制集的每个mongod进程应该位于不同的服务器。我们现在在一台机器上运行3个进程，因此要 为它们各自配置:
-
不同的端口。示例中将使用28017/28018/28019
-
不同的数据目录
~/data/db1 ~/data/db2 ~/data/db3 -
不同日志文件路径。
~/data/db1/mongod.log ~/data/db2/mongod.log ~/data/db3/mongod.log
配置文件如下：
# ~/data/db1/mongod.conf
systemLog:
destination: file
path: /Users/bo.liang/data/db1/mongod.log # log path
logAppend: true
storage:
dbPath: /Users/bo.liang/data/db1 # data directory
net:
bindIp: 127.0.0.1
port: 28017 # port
replication:
replSetName: rs0
processManagement:
fork: true
启动MongoDB进程
mongod -f ~/data/db1/mongod.conf
mongod -f ~/data/db2/mongod.conf
mongod -f ~/data/db3/mongod.conf
查看MongoDB进程
bo.liang 8911 0.1 0.2 5576252 27356 ?? S 7:21PM 0:00.56 mongod -f /Users/bo.liang/data/db3/mongod.conf
bo.liang 8760 0.1 0.2 5601200 30796 ?? S 7:19PM 0:00.96 mongod -f /Users/bo.liang/data/db1/mongod.conf
bo.liang 8889 0.1 0.2 5593800 27668 ?? S 7:21PM 0:00.58 mongod -f /Users/bo.liang/data/db2/mongod.conf
配置复制集
方法1
mongo localhost:28017
rs.initiate()
rs.add("HOSTNAME:28018")
rs.add("HOSTNAME:28019")
注意:此方式hostname 需要能被解析
> hostname -f
CNbo.liang
所以：
rs.add("CNbo.liang:28018")
rs.add("CNbo.liang:28019")
或者
rs.add("127.0.0.1:28018")
rs.add("127.0.0.1:28019")
rs0:PRIMARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2020-03-10T11:29:47.821Z"),
"myState" : 1,
"term" : NumberLong(1),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"heartbeatIntervalMillis" : NumberLong(2000),
"majorityVoteCount" : 2,
"writeMajorityCount" : 2,
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"lastCommittedWallTime" : ISODate("2020-03-10T11:29:45.024Z"),
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"readConcernMajorityWallTime" : ISODate("2020-03-10T11:29:45.024Z"),
"appliedOpTime" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"lastAppliedWallTime" : ISODate("2020-03-10T11:29:45.024Z"),
"lastDurableWallTime" : ISODate("2020-03-10T11:29:45.024Z")
},
"lastStableRecoveryTimestamp" : Timestamp(1583839762, 1),
"lastStableCheckpointTimestamp" : Timestamp(1583839762, 1),
"electionCandidateMetrics" : {
"lastElectionReason" : "electionTimeout",
"lastElectionDate" : ISODate("2020-03-10T11:23:21.032Z"),
"electionTerm" : NumberLong(1),
"lastCommittedOpTimeAtElection" : {
"ts" : Timestamp(0, 0),
"t" : NumberLong(-1)
},
"lastSeenOpTimeAtElection" : {
"ts" : Timestamp(1583839400, 1),
"t" : NumberLong(-1)
},
"numVotesNeeded" : 1,
"priorityAtElection" : 1,
"electionTimeoutMillis" : NumberLong(10000),
"newTermStartDate" : ISODate("2020-03-10T11:23:22.079Z"),
"wMajorityWriteAvailabilityDate" : ISODate("2020-03-10T11:23:22.136Z")
},
"members" : [
{
"_id" : 0,
"name" : "127.0.0.1:28017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 607,
"optime" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-03-10T11:29:45Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1583839401, 1),
"electionDate" : ISODate("2020-03-10T11:23:21Z"),
"configVersion" : 3,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "127.0.0.1:28018",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 8,
"optime" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-03-10T11:29:45Z"),
"optimeDurableDate" : ISODate("2020-03-10T11:29:45Z"),
"lastHeartbeat" : ISODate("2020-03-10T11:29:47.027Z"),
"lastHeartbeatRecv" : ISODate("2020-03-10T11:29:47.031Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "127.0.0.1:28017",
"syncSourceHost" : "127.0.0.1:28017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 3
},
{
"_id" : 2,
"name" : "127.0.0.1:28019",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 2,
"optime" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1583839785, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2020-03-10T11:29:45Z"),
"optimeDurableDate" : ISODate("2020-03-10T11:29:45Z"),
"lastHeartbeat" : ISODate("2020-03-10T11:29:47.027Z"),
"lastHeartbeatRecv" : ISODate("2020-03-10T11:29:47.325Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"configVersion" : 3
}
],
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1583839785, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1583839785, 1)
}
方法2
mongo localhost:28017
rs.initiate({
_id: "rs0",
members: [{
_id: 0,
host: "localhost:28017"
},{
_id: 1,
host: "localhost:28018"
},{
_id: 2,
host: "localhost:28019"
}]
})
验证
MongoDB 主节点进行写入
mongo localhost:28017
db.test.insert({ a:1 })
db.test.insert({ a:2 })
MongoDB 从节点进行读
mongo localhost:28018
rs.slaveOk()
db.test.find()
总结
- MongoDB 的生产环境要求搭建复制集
- MongoDB 复制集的搭建非常简单
- 实际环境要分三个物理(虚拟机)节点 (或以上
「真诚赞赏，手留余香」
请我喝杯咖啡？
使用微信扫描二维码完成支付
