本文介绍了在尝试启动SSHD服务时遇到的错误及其解决方法。主要错误包括无法加载主机密钥，导致协议版本被禁用和服务无法启动。通过使用ssh-keygen命令为不同的密钥类型生成新的主机密钥文件来解决问题。
在开启SSHD服务时报错.
sshd re-exec requires execution with an absolute path
用绝对路径启动,也报错如下:
Could not load host key: /etc/ssh/ssh_host_key
Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_dsa_key
Disabling protocol version 1. Could not load host key
Disabling protocol version 2. Could not load host key
sshd: no hostkeys available — exiting
sshd re-exec requires execution with an absolute path
用绝对路径启动,也报错如下:
Could not load host key: /etc/ssh/ssh_host_key
Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_dsa_key
Disabling protocol version 1. Could not load host key
Disabling protocol version 2. Could not load host key
sshd: no hostkeys available — exiting
解决过程:
#ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
#ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
#/usr/sbin/sshd
#ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
#ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
#/usr/sbin/sshd
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