What is SSH key revocation and how do I do it?

What is SSH key revocation and how do I do it?

SSH key revocation is the process of invalidating an SSH key so it can no longer be used for authentication. You can do this by removing the key from the authorized_keys file on the server or by using a certificate authority to revoke the key.

Why would I need to revoke an SSH key?

You might need to revoke an SSH key if it has been compromised, if an employee leaves your organization, or if you no longer need access to a server.

How do I remove a key from the authorized_keys file?

To remove a key, you can open the authorized_keys file in a text editor and delete the line containing the key you want to revoke. Make sure to save the changes afterward.

Is there a way to automate SSH key revocation?

Yes, you can automate SSH key revocation using configuration management tools like Ansible or Puppet, which can manage authorized_keys files across multiple servers.