wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.2.3.tgz
tar vxzf mongodb-linux-x86_64-2.2.3.tgz
cd mongodb-linux-x86_64-2.2.3
三台机器：一台主节点，两台副节点
1.在每一台上创建文件夹
2.每一台都启动mongodb配置文件形式
配置文件：storageEngine = wiredTiger
wiredTigerCacheSizeGB = 2
syncdelay = 30
wiredTigerCollectionBlockCompressor = snappy
port=27017
dbpath=/home/trs/mongodb_test/mongo/data/
oplogSize=2048
logpath=/home/trs/mongodb_test/mongo/data/mongodb.log
logappend=true
fork=true
rest=true
journal = true
replSet=rs0/192.168.106.222:27017
启动命令：bin/mongod --config /配置的路径
3.进入任意一台mongodb
进入命令：bin/mongo --port 27017
rsconf = { _id: "rs0", members: [ { _id: 0, host: "192.168.106.220:27017" } ] }
rs.initiate( rsconf )
rs.add("192.168.106.221:27017")
rs.add("192.168.106.222:27017")
rs.conf()