In this episode of Linux Server Admin with Fexingo, Lucas and Luna dive into SSH key-based authentication and server hardening. They walk through generating Ed25519 key pairs, disabling password authentication, configuring sshd for key-only access, and implementing fail2ban to block brute-force attacks. The discussion covers practical steps like using ssh-copy-id, setting proper permissions on ~/.ssh, and testing configurations safely. Lucas explains why Ed25519 keys are preferred over RSA for modern servers, and Luna shares a real-world case where a client's server was compromised due to weak SSH passwords. The episode also touches on advanced topics like SSH certificate authorities for fleet management and the principle of least privilege. Perfect for sysadmins looking to lock down Linux servers against unauthorized access. No prior episode has covered SSH hardening in this depth.

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