How to fully harden a Linux Server against attacks

Configurare noua (How To)

Situatie

Solutie

Phase 1: Access Control

  1. Disable password login

  2. Enforce SSH key authentication

  3. Change SSH port

  4. Limit login attempts

Phase 2: System Hardening

  1. Remove unused services

  2. Enable AppArmor

  3. Configure auditd

Phase 3: Network Security

  1. Advanced firewall rules

  2. Intrusion detection (Fail2Ban)

  3. Port scanning protection

Phase 4: Monitoring & Logging

  1. Centralized logging

  2. File integrity monitoring

  3. Automated alerts

Phase 5: Maintenance

  1. Automatic updates

  2. Backup configs

  3. Incident response testing

 Result: hardened server comparable to enterprise setups.

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