亚马逊光帆lightsail 开启账号密码登录

root为用户名，passwd为root用户密码，可以自定义修改密码

echo root:passwd |sudo chpasswd root
sudo sed -i 's/^#\?PermitRootLogin.*/PermitRootLogin yes/g' /etc/ssh/sshd_config;
sudo sed -i 's/^#\?PasswordAuthentication.*/PasswordAuthentication yes/g' /etc/ssh/sshd_config;
sudo reboot