1.在三个不同服务器上，分别建立副本集：
202服务器：
192.8.123.202:27017 replSet = r202
192.8.123.202:27018 replSet = r202
192.8.123.202:27019 replSet = r202
203服务器：
192.8.124.203:27017 replSet = r203
192.8.124.203:27018 replSet = r203
192.8.124.203:27019 replSet = r203
204服务器：
192.8.125.204:27017 replSet = r204
192.8.125.204:27018 replSet = r204
192.8.125.204:27019 replSet = r204
2.在202服务器上启动configsvr:
./bin/mongo --help | grep config
启动mongs:
进入mongos:
