Linux Host Hardening Stack Patterns
This note compares practical hardening stack patterns by organizational scale.
Small environment pattern
- Baseline controls: OpenSSH, nftables, fail2ban.
- Service hygiene: systemd unit hardening and least privilege.
- Logging: local plus lightweight central forwarding with rsyslog.
Medium environment pattern
- Baseline from small environments, plus regular host checks via Lynis.
- Endpoint telemetry with osquery.
- Mandatory access controls with either AppArmor or SELinux.
- Better incident traceability with auditd.
Enterprise environment pattern
- Centralized security monitoring with Wazuh and SIEM workflows.
- Coordinated threat response augmentation with CrowdSec.
- Strong policy/governance controls for config drift, key rotation, and evidence retention.
- Standardized fleet baselines linked to automation MOCs and change management.
Selection guidance
- Start simple, but design for staged maturity.
- Prefer predictable controls before advanced tooling.
- Treat detection quality and operational response as one system.