1. 修改SSH配置文件/etc/ssh/sshd_config

vi /etc/ssh/sshd_config

# Authentication:
PermitRootLogin yes

# Change to no to disable tunnelled clear text passwords
PasswordAuthentication yes

2. 给root用户设置密码(谷歌云)

passwd root

3. 重启SSH服务使修改生效

/etc/init.d/ssh restart