移植ssh：WARNING: Your password has expired.

问题1
Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_dsa_key
Could not load host key: /etc/ssh/ssh_host_ecdsa_key
Could not load host key: /etc/ssh/ssh_host_ed25519_key
Disabling protocol version 2. Could not load host key
sshd: no hostkeys available -- exiting.
解决办法：
ssh-keygen -t rsa -f /etc/ssh/ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key  -N ""
ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key  -N ""
ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key  -N ""
ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key  -N ""


问题2
WARNING: Your password has expired. You must change your password now and login again!
# cat /etc/shadow

root:$1$m.jegaqA$vA.rBTVryyUAcRvyZ2gOL1:0:0:99999:7:::

telnetd:$1$N4uZUEcU$yotoDExxgGXs6PE7PQuIR1:0:0:99999:7:::

honey:$1$SwtHyL/h$MsEX6Vnqz/qhwDsivDqD20:0:0:99999:7:::

sshd:$1$elylgRon$FOHgkwpPMcNI5s.iL8ZS/.:0:0:99999:7:::

这样的话，使用SSH登录就会出现用户登录失败，提示诸如“WARNING: Your password has expired. You must change your password now and login again!”等等。

需要手工修改，大致如下： 

# cat /etc/shadow

root:$1$m.jegaqA$vA.rBTVryyUAcRvyZ2gOL1:15695:5:99999:7:5:20000:

telnetd:$1$N4uZUEcU$yotoDExxgGXs6PE7PQuIR1:15695:5:99999:7:5:20000:

honey:$1$SwtHyL/h$MsEX6Vnqz/qhwDsivDqD20:15695:5:99999:7:5:20000:

sshd:$1$elylgRon$FOHgkwpPMcNI5s.iL8ZS/.:15695:5:99999:7:5:20000: