In episode 73 of Linux Server Admin with Fexingo, Lucas and Luna dive deep into AIDE (Advanced Intrusion Detection Environment) for Linux server file integrity monitoring. They explain how AIDE creates a baseline database of file checksums, permissions, and metadata, then compares current state to detect unauthorized changes. Using a real-world example of a compromised web server, Lucas walks through initializing the AIDE database, running manual checks, and automating daily scans with systemd timers. They discuss tuning AIDE for performance on large filesystems, excluding noisy directories like /tmp and /proc, and integrating alerts with syslog or email. Luna raises the challenge of database drift during legitimate updates and how to handle re-initialization securely. The episode closes with a comparison of AIDE vs. Tripwire, and a practical recommendation for lean security monitoring on production servers.

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