树莓派系统（基于Deibian）启用root账户

为root设置密码

pi@raspberrypi:~ $ sudo passwd root
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

解锁root账户

pi@raspberrypi:~ $ sudo passwd --unlock root
passwd: password expiry information changed.

去/etc下

pi@raspberrypi:/etc/ssh $ ls
moduli            ssh_host_dsa_key.pub    ssh_host_ed25519_key.pub
ssh_config        ssh_host_ecdsa_key      ssh_host_rsa_key
sshd_config       ssh_host_ecdsa_key.pub  ssh_host_rsa_key.pub
ssh_host_dsa_key  ssh_host_ed25519_key

修改ssh配置文件的读写属性

pi@raspberrypi:/etc/ssh $ sudo chmod a+wx sshd_config

搜索关键字Permit

:/Permit

修改PermitRootLogin的属性

# Authentication:
LoginGraceTime 120
PermitRootLogin yes