准备工作
环境：CentOS6.564位
MongoDB3.0.164位
一、启动mongod服务
[root@localhost data]# /usr/local/mongodb3.0.1/bin/mongod –port 40144 –dbpath=/data/mongodb3.0.1/data/ –logpath=/data/mongodb3.0.1/log/mongodb.log –directoryperdb –maxConns 100 –logappend –replSet repl/192.168.66.89:50144 –fork[root@localhost data]# /usr/local/mongodb3.0.1/bin/mongod –port 50144 –dbpath=/data/mongodb3.0.1/db_50144/ –logpath=/data/mongodb3.0.1/db_50144/mongodb.log –directoryperdb –maxConns 100 –logappend –replSet repl/192.168.66.89:40144 –fork[root@localhost data]# /usr/local/mongodb3.0.1/bin/mongod –port 60144 –dbpath=/data/mongodb3.0.1/db_60144/ –logpath=/data/mongodb3.0.1/db_60144/mongodb.log –directoryperdb –maxConns 100 –logappend –replSet repl/192.168.66.89:40144 –fork
参数：
–oplogSize 日志操作文件的大（默认磁盘剩余空间的5%）
–dbpath 数据文件路径
–logpath 日志文件路径
–port 端口号，默认是27017
–replSet 复制集的名字，一个replica sets中的每个节点的这个参数都要用一个复制集名字，这里是test.
–replSet test/ 这个后面跟的是其他standard节点的ip和端口
–maxConns 最大连接数
–fork后台运行
–logappend 日志文件循环使用，如果日志文件已满，那么新日志覆盖最久日志。
任选一个节点登录mongodb数据库
[root@localhost data]# /usr/local/mongodb3.0.1/bin/mongo –port 40144MongoDB shell version: 3.0.1connecting to: 127.0.0.1:40144/testServer has startup warnings:2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten]2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten]2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is ‘always’.2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten] ** We suggest setting it to ‘never’2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten]2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is ‘always’.2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten] ** We suggest setting it to ‘never’2015-05-08T09:06:42.270+0800 I CONTROL [initandlisten]#使用admin数据库> use admin;switched to db admin#定义副本集配置变量并初始化，这里的 _id:”replSet” 和上面命令参数“–replSet repl” 要保持一样> db.runCommand({"replSetInitiate":{"_id":"repl","members":[{"_id":1,"host":"192.168.66.89:40144"},{"_id":2,"host":"192.168.66.89:50144"},{"_id":3,"host":"192.168.66.89:60144"}]}});{ "ok" : 1 }#查看副本集信息repl:OTHER> db._adminCommand("replSetGetStatus");{"set" : "repl","date" : ISODate("2015-05-08T01:18:55.619Z"),"myState" : 1,"members" : [{"_id" : 1,"name" : "192.168.66.89:40144","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 776,"optime" : Timestamp(1431047920, 1),"optimeDate" : ISODate("2015-05-08T01:18:40Z"),"electionTime" : Timestamp(1431047923, 1),"electionDate" : ISODate("2015-05-08T01:18:43Z"),"configVersion" : 1,"self" : true},{"_id" : 2,"name" : "192.168.66.89:50144","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 15,"optime" : Timestamp(1431047920, 1),"optimeDate" : ISODate("2015-05-08T01:18:40Z"),"lastHeartbeat" : ISODate("2015-05-08T01:18:53.650Z"),"lastHeartbeatRecv" : ISODate("2015-05-08T01:18:53.650Z"),"pingMs" : 0,"lastHeartbeatMessage" : "could not find member to sync from","configVersion" : 1},{"_id" : 3,"name" : "192.168.66.89:60144","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 15,"optime" : Timestamp(1431047920, 1),"optimeDate" : ISODate("2015-05-08T01:18:40Z"),"lastHeartbeat" : ISODate("2015-05-08T01:18:53.650Z"),"lastHeartbeatRecv" : ISODate("2015-05-08T01:18:53.649Z"),"pingMs" : 0,"lastHeartbeatMessage" : "could not find member to sync from","configVersion" : 1}],"ok" : 1}二、测试1、主节点写入数据，其他节点查询repl:PRIMARY> use mtdamai;switched to db mtdamairepl:PRIMARY> db.user.insert({name:"wangxiuli"});WriteResult({ "nInserted" : 1 })repl:PRIMARY> db.user.find();{ "_id" : ObjectId("554c237123db30ab1a233e4b"), "name" : "wangxiuli" }#备节点查询发现已有数据repl:SECONDARY> use mtdamai;switched to db mtdamairepl:SECONDARY> db.user.find();{ "_id" : ObjectId("554c237123db30ab1a233e4b"), "name" : "wangxiuli" }2、停止主节点repl:SECONDARY> rs.status();{"set" : "repl","date" : ISODate("2015-05-08T02:51:25.273Z"),"myState" : 2,"members" : [{"_id" : 1,"name" : "192.168.66.89:40144","health" : 0,"state" : 8,"stateStr" : "(not reachable/healthy)","uptime" : 0,"optime" : Timestamp(0, 0),"optimeDate" : ISODate("1970-01-01T00:00:00Z"),"lastHeartbeat" : ISODate("2015-05-08T02:51:23.984Z"),"lastHeartbeatRecv" : ISODate("2015-05-08T02:50:55.975Z"),"pingMs" : 0,"lastHeartbeatMessage" : "Failed attempt to connect to 192.168.66.89:40144; couldn’t connect to server 192.168.66.89:40144 (192.168.66.89), connection attempt failed","configVersion" : -1},{"_id" : 2,"name" : "192.168.66.89:50144","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 5563,"optime" : Timestamp(1431053169, 2),"optimeDate" : ISODate("2015-05-08T02:46:09Z"),"lastHeartbeat" : ISODate("2015-05-08T02:51:24.227Z"),"lastHeartbeatRecv" : ISODate("2015-05-08T02:51:24.120Z"),"pingMs" : 0,"electionTime" : Timestamp(1431053458, 1),"electionDate" : ISODate("2015-05-08T02:50:58Z"),"configVersion" : 1},{"_id" : 3,"name" : "192.168.66.89:60144","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 5733,"optime" : Timestamp(1431053169, 2),"optimeDate" : ISODate("2015-05-08T02:46:09Z"),"configVersion" : 1,"self" : true}],"ok" : 1}#发现主节点已经重新被选出再来插入数据验证repl:PRIMARY> db.user.insert({name:"chenglong"});WriteResult({ "nInserted" : 1 })repl:PRIMARY> db.user.find();{ "_id" : ObjectId("554c237123db30ab1a233e4b"), "name" : "wangxiuli" }{ "_id" : ObjectId("554c25202dcdffb154643e56"), "name" : "chenglong" }#验证备节点不可写repl:SECONDARY> db.user.insert({name:"liudehua"});WriteResult({ "writeError" : { "code" : undefined, "errmsg" : "not master" } })#查询数据已存在，，说明数据已同步到其他节点repl:SECONDARY> use mtdamai;switched to db mtdamairepl:SECONDARY> db.user.find();Error: error: { "$err" : "not master and slaveOk=false", "code" : 13435 }repl:SECONDARY> rs.slaveOk();repl:SECONDARY> db.user.find();{ "_id" : ObjectId("554c237123db30ab1a233e4b"), "name" : "wangxiuli" }{ "_id" : ObjectId("554c25202dcdffb154643e56"), "name" : "chenglong" }#再次启动被关闭的节点，该节点变为secondaryrepl:SECONDARY> rs.status();{"set" : "repl","date" : ISODate("2015-05-08T07:54:20.607Z"),"myState" : 2,"syncingTo" : "192.168.66.89:50144","members" : [{"_id" : 1,"name" : "192.168.66.89:40144","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 19,"optime" : Timestamp(1431053600, 1),"optimeDate" : ISODate("2015-05-08T02:53:20Z"),"lastHeartbeat" : ISODate("2015-05-08T07:54:19.079Z"),"lastHeartbeatRecv" : ISODate("2015-05-08T07:54:20.557Z"),"pingMs" : 0,"syncingTo" : "192.168.66.89:60144","configVersion" : 1},{"_id" : 2,"name" : "192.168.66.89:50144","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 23738,"optime" : Timestamp(1431053600, 1),"optimeDate" : ISODate("2015-05-08T02:53:20Z"),"lastHeartbeat" : ISODate("2015-05-08T07:54:20.152Z"),"lastHeartbeatRecv" : ISODate("2015-05-08T07:54:20.105Z"),"pingMs" : 0,"electionTime" : Timestamp(1431053458, 1),"electionDate" : ISODate("2015-05-08T02:50:58Z"),"configVersion" : 1},{"_id" : 3,"name" : "192.168.66.89:60144","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 23908,"optime" : Timestamp(1431053600, 1),"optimeDate" : ISODate("2015-05-08T02:53:20Z"),"syncingTo" : "192.168.66.89:50144","configVersion" : 1,"self" : true}],"ok" : 1}#数据也同步过来了repl:SECONDARY> use mtdamai;switched to db mtdamairepl:SECONDARY> db.user.find();{ "_id" : ObjectId("554c237123db30ab1a233e4b"), "name" : "wangxiuli" }{ "_id" : ObjectId("554c25202dcdffb154643e56"), "name" : "chenglong" }
问候不一定要慎重其事，但一定要真诚感人
