本文详细介绍了如何修改SSH配置文件sshd_config，将root用户的密码登录改为使用SSH密钥登录，避免了直接输入密码的安全风险，并提供了创建SSH密钥和添加到root用户目录的方法。
By default, the SSH server denies password-based login for root. In /etc/ssh/sshd_config, change:
PermitRootLogin without-password
to
PermitRootLogin yes
And restart SSH:
sudo service ssh restart
Or, you can use SSH keys. If you don't have one, create one using ssh-keygen (stick to the default for the key, and skip the password if you feel like it). Then do sudo -s (or whatever your preferred method of becoming root is), and add an SSH key to /root/.ssh/authorized_keys:
cat /home/user/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
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