如果使用自带的openssh-server会报错：
-> # service ssh restartCould not load host key: /etc/ssh/ssh_host_rsa_keyCould not load host key: /etc/ssh/ssh_host_ecdsa_keyCould not load host key: /etc/ssh/ssh_host_ed25519_key* Restarting OpenBSD Secure Shell server sshdCould not load host key: /etc/ssh/ssh_host_rsa_keyCould not load host key: /etc/ssh/ssh_host_ecdsa_keyCould not load host key: /etc/ssh/ssh_host_ed25519_key
解决方法是重新安装一遍ssh:
apt remove openssh-serverapt install openssh-server
安装完成后会帮您自动生成key：
Creating SSH2 RSA key; this may take some time ...2048 SHA256:SXW3I76yinDKanRfoqoU7wYaGVE4O16OzJjXeqcYb0Q root@sidanzhang-PC0 (RSA)Creating SSH2 ECDSA key; this may take some time ...256 SHA256:0CBWETIqv1r2fV5gvTgoIAbKGUWZxHpv7jUOW+g+jhw root@sidanzhang-PC0 (ECDSA)Creating SSH2 ED25519 key; this may take some time ...256 SHA256:wpLX9XLMf8YtvFv7Bud6ZdaW0syZ15En5MDH/P654dQ root@sidanzhang-PC0 (ED25519)invoke-rc.d: could not determine current runlevel
然后启动服务就可以使用了：
-> # service ssh start* Starting OpenBSD Secure Shell server sshd
