SSH相关

1. 配置云服务器登陆信息，可快速登陆，不用每次手动输入IP地址和密码

Host server1
    HostName xxx.xxx.xxx.xxx
    User root
    IdentityFile ~/.ssh/id_rsa

Host server2
    HostName xxx.xxx.xxx.xxx
    User user2
    IdentityFile ~/.ssh/id_rsa

Host server3
    HostName xxx.xxx.xxx.xxx
    User ubuntu
    IdentityFile ~/.ssh/id_rsa
    Port 2222