#简述：副本集合（Replica Sets)，是一个基于主/从复制机制的复制功能，但增加了自动故障转移和恢复特性，一个集群最多
可以支持7个服务器，并且任意节点都可以是主节点。所有的写操作都被分发到主节点，而读操作可以在任何节点上进行;
#系统环境
OS CentOS6.5
server1 192.168.3.100:27017
server1 192.168.3.100:27018
node1 192.168.3.101:27017
node2 192.168.3.102:27017
#配置副本集方法之一（自动选定某一台数据库为主数据库）
#server1启动节点
mkdir /application/mongodb/database /application/mongodb/logs
/application/mongodb/bin/mongod --rest --replSet fuben/192.168.3.100:27017 --port 27017 --dbpath=/application/mongodb/database --logpath=/application/mongodb/logs/mongodb.log --fork
#node1启动节点
mkdir /application/mongodb/database /application/mongodb/logs
/application/mongodb/bin/mongod --rest --replSet fuben/192.168.3.101:27017 --port 27017 --dbpath=/application/mongodb/database --logpath=/application/mongodb/logs/mongodb.log --fork
#node2启动节点
mkdir /application/mongodb/database /application/mongodb/logs
/application/mongodb/bin/mongod --rest --replSet fuben/192.168.3.102:27017 --port 27017 --dbpath=/application/mongodb/database --logpath=/application/mongodb/logs/mongodb.log --fork
#server1启动仲裁节点
mkdir /application/mongodb/arb
/application/mongodb/bin/mongod --rest --replSet fuben --dbpath=/application/mongodb/arb --port 27018 --logpath=/application/mongodb/logs/arb.log --fork
#Server1登陆mongo
/application/mongodb/bin/mongo --port 27017
#初始化节点（server1上操作）
> rs.initiate({_id:"fuben",members:[{_id:1,host:"192.168.3.100:27017"},{_id:2,host:"192.168.3.101:27017"},{_id:3,host:"192.168.3.102:27017"},{_id:4,host:"192.168.3.100:27018","arbiterOnly":true}]});
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
#查看副本集状态
fuben:PRIMARY> rs.status()
{
"set" : "fuben",
"date" : ISODate("2015-05-18T13:27:21Z"),
"myState" : 1,
"members" : [
{
"_id" : 1,
"name" : "192.168.3.100:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY", #主
"uptime" : 352,
"optime" : Timestamp(1431955576, 1),
"optimeDate" : ISODate("2015-05-18T13:26:16Z"),
"electionTime" : Timestamp(1431955587, 1),
"electionDate" : ISODate("2015-05-18T13:26:27Z"),
"self" : true
},
{
"_id" : 2,
"name" : "192.168.3.101:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY", #从
"uptime" : 64,
"optime" : Timestamp(1431955576, 1),
"optimeDate" : ISODate("2015-05-18T13:26:16Z"),
"lastHeartbeat" : ISODate("2015-05-18T13:27:21Z"),
"lastHeartbeatRecv" : ISODate("2015-05-18T13:27:20Z"),
"pingMs" : 0,
"syncingTo" : "192.168.3.100:27017"
},
{
"_id" : 3,
"name" : "192.168.3.102:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY", #从
"uptime" : 62,
"optime" : Timestamp(1431955576, 1),
"optimeDate" : ISODate("2015-05-18T13:26:16Z"),
"lastHeartbeat" : ISODate("2015-05-18T13:27:21Z"),
"lastHeartbeatRecv" : ISODate("2015-05-18T13:27:21Z"),
"pingMs" : 0,
"syncingTo" : "192.168.3.100:27017"
},
{
"_id" : 4,
"name" : "192.168.3.100:27018",
"health" : 1,
"state" : 7,
"stateStr" : "ARBITER", #仲裁
"uptime" : 62,
"lastHeartbeat" : ISODate("2015-05-18T13:27:21Z"),
"lastHeartbeatRecv" : ISODate("2015-05-18T13:27:21Z"),
"pingMs" : 0
}
],
"ok" : 1
}
#在PRIMARY上面操作，建库建表，从数据库只有读的权限
fuben:PRIMARY> show dbs;
local 1.078125GB
fuben:PRIMARY> use testdb;
switched to db testsb
fuben:PRIMARY> db.document01.insert({"name":"wsq","sex":"M","age":"20"});
fuben:PRIMARY> show tables;
document01
system.indexes
fuben:PRIMARY> db.document01.find();
{ "_id" : ObjectId("5511551aa51f85ff07b6df0c"), "name" : "wsq", "sex" : "M", "age" : "20" }
#node1登陆mongo
/application/mongodb/bin/mongo --port 27017
#设置从库可读（从库上执行）
fuben:SECONDARY> show dbs;
local 1.078125GB
testdb 0.203125GB
fuben:SECONDARY> use testdb;
switched to db testdb
fuben:SECONDARY> show tables;
Tue Mar 24 19:53:32.513 error: { "$err" : "not master and slaveOk=false", "code" : 13435 } at src/mongo/shell/query.js:128 #因为没有读的权限
fuben:SECONDARY> rs.slaveOk(); #如果不执行该步骤从库上不可读数据
fuben:SECONDARY> show tables;
document01
system.indexes
fuben:SECONDARY> db.document01.find();
{ "_id" : ObjectId("5511551aa51f85ff07b6df0c"), "name" : "wsq", "sex" : "M", "age" : "20" }
#配置副本集方法之二（手动选定某一台数据库为主数据库）
#server1启动节点
mkdir -p /mongodb/data/db /mongodb/data/logs
mongod --rest --replSet fuben/192.168.3.171:27017 --master --port 27017 --dbpath=/mongodb/data/db --logpath=/mongodb/data/logs/mongodb.log --fork
#node1启动节点
mkdir -p /mongodb/data/db /mongodb/data/logs
mongod --rest --replSet fuben/192.168.3.204:27017 --port 27017 --dbpath=/mongodb/data/db --logpath=/mongodb/data/logs/mongodb.log --fork
#node2启动节点
mkdir -p /mongodb/data/db /mongodb/data/logs
mongod --rest --replSet fuben/192.168.3.108:27017 --port 27017 --dbpath=/mongodb/data/db --logpath=/mongodb/data/logs/mongodb.log --fork
#初始化节点：（登陆其中任何一个节点操作皆可）
[root@server1 /]# mongo --port 27017
MongoDB shell version: 2.4.12
connecting to: 127.0.0.1:27017/test
> rs.initiate({_id:"fuben",members:[{_id:1,host:"192.168.3.171:27017",priority:2},{_id:2,host:"192.168.3.204:27017",priority:3},{_id:3,host:"192.168.3.108:27017",priority:4}]});
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
#priority 是设置优先级的，默认优先级为1,可以是1-1000的数字
#验证
fuben:PRIMARY> rs.status();
{
"set" : "fuben",
"date" : ISODate("2015-03-24T12:12:14Z"),
"myState" : 1,
"members" : [
{
"_id" : 1,
"name" : "192.168.10.171:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY", #从
"uptime" : 195,
"optime" : Timestamp(1427198934, 1),
"optimeDate" : ISODate("2015-03-24T12:08:54Z"),
"lastHeartbeat" : ISODate("2015-03-24T12:12:13Z"),
"lastHeartbeatRecv" : ISODate("2015-03-24T12:12:13Z"),
"pingMs" : 0,
"syncingTo" : "192.168.10.108:27017"
},
{
"_id" : 2,
"name" : "192.168.10.204:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY", #从
"uptime" : 195,
"optime" : Timestamp(1427198934, 1),
"optimeDate" : ISODate("2015-03-24T12:08:54Z"),
"lastHeartbeat" : ISODate("2015-03-24T12:12:13Z"),
"lastHeartbeatRecv" : ISODate("2015-03-24T12:12:13Z"),
"pingMs" : 0,
"syncingTo" : "192.168.10.171:27017"
},
{
"_id" : 3,
"name" : "192.168.10.108:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY", #主
"uptime" : 498,
"optime" : Timestamp(1427198934, 1),
"optimeDate" : ISODate("2015-03-24T12:08:54Z"),
"self" : true
}
],
"ok" : 1
}
#查看当前主库
fuben:SECONDARY> rs.isMaster();
{
"setName" : "fuben",
"setVersion" : 1,
"ismaster" : false,
"secondary" : true,
"hosts" : [
"192.168.3.102:27017",
"192.168.3.101:27017",
"192.168.3.100:27017"
],
"arbiters" : [
"192.168.3.100:27018"
],
"primary" : "192.168.3.100:27017",
"me" : "192.168.3.102:27017",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"maxWriteBatchSize" : 1000,
"localTime" : ISODate("2015-05-18T13:36:41.854Z"),
"maxWireVersion" : 2,
"minWireVersion" : 0,
"ok" : 1
}
