切换到root角色

sudo -i

修改SSH配置文件/etc/ssh/sshd_config

vi /etc/ssh/sshd_config
修改PermitRootLogin和PasswordAuthentication为yes
# Authentication:
PermitRootLogin yes //默认为no，需要开启root用户访问改为yes
# Change to no to disable tunnelled clear text passwords
PasswordAuthentication yes //默认为no，改为yes开启密码登陆

重启SSH服务使修改生效

/etc/init.d/ssh restart