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I have a ssh server, and some clients have login it via key login. So the host identity of server has been stored in the known_host of clients.

I want to reinstall the server, but I hope it never impact the experience of client. I'm wondering whether it's possible to backup the host identity of server, then restore it.

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  • You can backup those keys from /etc/ssh/ssh_host*
  • You can also backup all in /etc/ssh directory so that you keep all config and keys.
  • And to restore put your keys back in the same location /etc/ssh

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    for posterity- pay attention to the permissions. All the /etc/ssh/* files should be owned by root:root, with 644 permissions except for those that end in *key, which should be 600.
    – tedder42
    Apr 3, 2015 at 18:21
  • Afterwards, you probably need a sudo service ssh restart
    – nealmcb
    Jul 26, 2021 at 1:57

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