1. 安裝openssh-server
```
sudo apt-get install openssh-server
```
2. 查看服務是否開啟
```
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.重啟sshd
```
service sshd restart
```
