Warning: remote host identification has changed

ssh-updatehost.sh

#!/usr/bin/env sh

HOST=$1

ssh-keygen -R "${HOST}"
ssh-keyscan -H "${HOST}" >> ~/.ssh/known_hosts

Warning: remote host identification has changed.md

Remove the host from known_hosts

If you trust the server and already know that server fingerprint changed due to re-install for example; you could just remove the previous identification from the known_hosts file.

ssh-keygen -R "remote.host.ip"

You can then add the new fingerprint if you don't want ssh to prompt you to do so.

ssh-keyscan -H remote.host.ip >> ~/.ssh/known_hosts

Automate the process

If you would like to automate this process, a simple shell script could ease the task

#!/usr/bin/env sh

HOST=$1

ssh-keygen -R "${HOST}"
ssh-keyscan -H "${HOST}" >> ~/.ssh/known_hosts