1. 安装openssh-server ``` sudo apt-get install openssh-server ``` 2. 查看服务是否开启 ``` ps -ef|grep sshd ``` 3. 修改配置 ``` sudo vi /etc/ssh/sshd_config ```  注掉`PermitRootLogin prohibit-password`，增加`PermitRootLogin yes` 4.重启sshd ``` service sshd restart ```