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 sshd: no hostkeys available – exiting.

1、檢查主機密鑰文件是否存在

ls -l /etc/ssh/ssh_host_*

2、生成主機密鑰

sudo ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''
sudo ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key