21CTO

Mar 5, 2021 · Information Security

Essential Linux Security Hardening: Account, Service, and Rootkit Defense

This guide walks operations engineers through comprehensive Linux hardening techniques—including account and login protection, unnecessary service removal, password and key authentication policies, proper use of sudo, system welcome message sanitization, file‑system safeguards, and practical rootkit detection with chkrootkit and RKHunter—plus a step‑by‑step response plan for compromised servers.