环境角色规划如下，7台服务器hosts文件统一配置：
vim /etc/hosts
10.12.237.103 orderer0.example.com
10.12.236.210 orderer1.example.com
10.12.237.112 orderer2.example.com
10.12.237.114 peer0.org1.example.com
10.12.237.120 peer1.org1.example.com
10.12.237.127 peer0.org2.example.com
10.12.237.132
