mongoDB副本集搭建

准备三台服务器：

　　10.175.120.131(主节点)

　　10.175.121.134(副本节点)

　　10.175.121.136(副本节点)

1.分别在每台服务器上安装MongoDB，并通过配置文件启动服务，配置文件如下：

dbpath=/data/db               #指定数据库路径logpath=/data/mongodb.log     #指定日志文件路径logappend=true                #在日志文件持续添加port=27017                    #端口号bind_ip=0.0.0.0               #允许远程访问fork=true                     #后台运行replSet=admin                 #设置副本集名称

2.进入MongoDB后台管理 Shell　

./momgo

3.使用admin数据库

> use admin

4. 定义副本集配置变量，这里的 _id:”admin” 和配置文件中的“replSet=admin” 要保持一致

> config = { _id:"admin",members:[{_id:0,host:"10.175.120.131:27017"},{_id:1,host:"10.175.121.134:27017"},{_id:2,host:"10.175.121.136:27017"}]}

5.初始化副本集配置

> rs.initiate(config)

6.查看集群节点的状态

> rs.status()

输出：

{        "set" : "admin",        "date" : ISODate("2018-09-21T08:52:24.064Z"),        "myState" : 1,        "term" : NumberLong(3),        "heartbeatIntervalMillis" : NumberLong(2000),        "optimes" : {                "lastCommittedOpTime" : {                        "ts" : Timestamp(1537519943, 1),                        "t" : NumberLong(3)},                "readConcernMajorityOpTime" : {                        "ts" : Timestamp(1537519943, 1),                        "t" : NumberLong(3)},                "appliedOpTime" : {                        "ts" : Timestamp(1537519943, 1),                        "t" : NumberLong(3)},                "durableOpTime" : {                        "ts" : Timestamp(1537519943, 1),                        "t" : NumberLong(3)}},        "members" : [{                        "_id" : 1,                        "name" : "10.175.120.131:27017",                        "health" : 1, "state" : 1,                        "stateStr" : "PRIMARY",                        "uptime" : 5874,                        "optime" : {                                "ts" : Timestamp(1537519943, 1),                                "t" : NumberLong(3)},                        "optimeDate" : ISODate("2018-09-21T08:52:23Z"),                        "electionTime" : Timestamp(1537514082, 1),                        "electionDate" : ISODate("2018-09-21T07:14:42Z"),                        "configVersion" : 1,                        "self" : true},{                        "_id" : 2,                        "name" : "10.175.121.134:27017",                        "health" : 1,                        "state" : 2,                        "stateStr" : "SECONDARY",                        "uptime" : 5861,                        "optime" : {                                "ts" : Timestamp(1537519933, 1),                                "t" : NumberLong(3)},                        "optimeDurable" : {                                "ts" : Timestamp(1537519933, 1),                                "t" : NumberLong(3)},                        "optimeDate" : ISODate("2018-09-21T08:52:13Z"),                        "optimeDurableDate" : ISODate("2018-09-21T08:52:13Z"),                        "lastHeartbeat" : ISODate("2018-09-21T08:52:23.012Z"),                        "lastHeartbeatRecv" : ISODate("2018-09-21T08:52:23.584Z"),                        "pingMs" : NumberLong(0),                        "syncingTo" : "10.175.120.131:27017",                        "configVersion" : 1},{                        "_id" : 3,                        "name" : "10.175.121.136:27017",                        "health" : 1,                        "state" : 2,                        "stateStr" : "SECONDARY",                        "uptime" : 5866,                        "optime" : {                                "ts" : Timestamp(1537519933, 1),                                "t" : NumberLong(3)},                        "optimeDurable" : {                                "ts" : Timestamp(1537519933, 1),                                "t" : NumberLong(3)},                        "optimeDate" : ISODate("2018-09-21T08:52:13Z"),                        "optimeDurableDate" : ISODate("2018-09-21T08:52:13Z"),                        "lastHeartbeat" : ISODate("2018-09-21T08:52:23.013Z"),                        "lastHeartbeatRecv" : ISODate("2018-09-21T08:52:23.558Z"),                        "pingMs" : NumberLong(0),                        "syncingTo" : "10.175.120.131:27017",                        "configVersion" : 1}],        "ok" : 1,        "operationTime" : Timestamp(1537519943, 1),        "$clusterTime" : {                "clusterTime" : Timestamp(1537519943, 1),                "signature" : {                        "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),                        "keyId" : NumberLong(0)}}
}

输出部分参数说明：

"health" : 1,              #代表机器正常 "stateStr" : "PRIMARY",    #代表是主节点，可读写，其中有以下几下状态1. STARTUP：刚加入到复制集中，配置还未加载
2. STARTUP2：配置已加载完，初始化状态
3. RECOVERING：正在恢复，不适用读
4. ARBITER: 仲裁者
5. DOWN：节点不可到达
6. UNKNOWN：未获取其他节点状态而不知是什么状态，一般发生在只有两个成员的架构，脑裂
7. REMOVED：移除复制集
8. ROLLBACK：数据回滚，在回滚结束时，转移到RECOVERING或SECONDARY状态
9. FATAL：出错。查看日志grep “replSet FATAL”找出错原因，重新做同步
10. PRIMARY：主节点
11. SECONDARY：备份节点