检查问题
sshd -t
问题1：
Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_ecdsa_key
Could not load host key: /etc/ssh/ssh_host_ed25519_key
解决方式
ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
ssh-keygen -t ecdsa -P '' -f /etc/ssh/ssh_host_ecdsa_key
ssh-keygen -t ed25519 -P '' -f /etc/ssh/ssh_host_ed25519_key
