Essential Linux Server Security Checklist

Linux servers are powerful for hosting, email, databases and custom applications. But a server left with default settings can become risky over time. Basic hardening steps should be applied and reviewed regularly.

Harden SSH access

Use strong authentication, limit root access where possible and monitor failed login attempts. Changing the SSH port may reduce automated noise, but it is not a complete security solution.

Firewall and services

Only required ports should remain open. Unused services should be disabled and firewall rules should stay simple and documented.

Updates, monitoring and backups

Keep packages and applications updated, monitor logs and resource usage, and maintain restorable backups. Security is strongest when prevention, detection and recovery work together.