2. use ssh to login remote server. Look this. https://help.github.com/articles/generating-an-ssh-key/
3. download this repp, in tool.sh, you can define your server ips. etc. You can see the example in cli.sh. The you can login any server that you want free.
thx all!
2. 用ssh无密码登录本地和跳板机。ssh 免密码登录
over.