Replica Sets（复制集）是在mongodDB1.6版本开始新增的功能，它可以实现故障自动切换和自动修复功能成员节点的功能，各个DB之间的数据完全一致，大大降低了单点故障的风险。 【】 以上图示是三个节点的Replica Set架构。该图来源于红丸编写的《Mongodb管理与
Replica Sets（复制集）是在mongodDB1.6版本开始新增的功能，它可以实现故障自动切换和自动修复功能成员节点的功能，各个DB之间的数据完全一致，大大降低了单点故障的风险。
【】
以上图示是三个节点的Replica Set架构。该图来源于红丸编写的《Mongodb管理与开发精要》这本书。从上图可以看出，结构类似与一个集群，其实完全可以当做一个集群。因为它确实和集群实现的作用是相同的。
一、部署Replica Sets.
接下来显示如何在一台服务器上面演示部署3个节点的Replica Sets
二、启动Replica服务
分别打开三个命令窗口，然后分别执行下面三句话。
mongod.exe --replSet rs1 --keyFile "D:\Program Files\mongodb\data\replica\key\r0" --port 28010 --dbpath "D:\Program Files\mongodb\data\replica\data\r0" --logpath "D:\Program Files\mongodb\data\replica\log\r0.log" --logappend mongod.exe --replSet rs1 --keyFile "D:\Program Files\mongodb\data\replica\key\r1" --port 28011 --dbpath "D:\Program Files\mongodb\data\replica\data\r1" --logpath "D:\Program Files\mongodb\data\replica\log\r1.log" --logappend cd /d D:\Program Files\mongodb\bin mongod.exe --replSet rs1 --keyFile "D:\Program Files\mongodb\data\replica\key\r2" --port 28012 --dbpath "D:\Program Files\mongodb\data\replica\data\r2" --logpath "D:\Program Files\mongodb\data\replica\log\r2.log" --logappend
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