Fix SSH warning "Remote host identification has changed" after server move.

fix-ssh-warning.sh

# Remove all old entries for my.example.com
ssh-keygen -R my.example.com

# Scan all supported fingerprints from the new server and insert them in your known_hosts file
ssh-keyscan my.example.com >> ~/.ssh/known_hosts

Issue:

If you have moved to a new server and want to access it with SSH via domain name, you will get the warning "Remote host identification has changed" due to changed SSH fingerprints in your `~/.ssh/known_host` file.

The code snippet addresses the challenge of updating SSH fingerprints in the known_hosts file for a server, particularly in cases where the server's keys have been changed, or there are discrepancies with the existing entries.

Solution:

Remove all old entries from the `~/.ssh/known_host` file and insert the new fingerprint(s). Hint: Only do this if you are sure that the new server is under your control.

This code snippet provides a solution to update the SSH fingerprints in the known_hosts file. It first removes any old entries related to a specific hostname (my.example.com) using the ssh-keygen command with the -R option. Then, it scans and appends all supported fingerprints from the new server to the known_hosts file using the ssh-keyscan command.

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