Dedicated Server Security Checklist: Complete Linux Server Hardening Guide
A practical guide to SSH hardening, firewalls, intrusion prevention, eBPF monitoring, WAF protection, integrity monitoring, and disaster recovery for Linux servers.
A newly deployed Linux server can start receiving automated scans and attack attempts within minutes of being exposed to the public internet.
While performance and scalability often receive the most attention, security misconfigurations remain one of the most common causes of server compromise.
A modern Linux hardening strategy should include:
SSH Hardening
Disable password authentication, prevent direct root logins, and implement multi-factor authentication for administrative access.
Network Security
Adopt a default-deny firewall policy and expose only the services required by your applications.
Intrusion Prevention
Leverage tools such as CrowdSec and Fail2Ban to mitigate brute-force attacks and block known malicious actors.
Runtime Threat Detection
Modern security monitoring is increasingly powered by eBPF technologies such as Falco, Tetragon, and Tracee, enabling kernel-level observability with minimal overhead.
Web Application Protection
Deploy a Web Application Firewall (WAF) such as ModSecurity or Coraza to defend against SQL injection, XSS, and other application-layer attacks.
File Integrity Monitoring
Solutions such as AIDE, Wazuh, and Lynis help detect unauthorized changes and security weaknesses before they become major incidents.
Backup & Disaster Recovery
Encrypted, off-site backups and regular restoration testing are critical components of any security strategy.
I've covered each of these areas in detail, along with practical implementation guidance for Ubuntu, AlmaLinux, and production Linux environments.
Read the complete guide: Dedicated Server Security Checklist: Complete Linux Server Hardening Guide
