Linux Server Hardening & Enterprise Administration
Scope: Ubuntu/Debian, SSH Key Authentication, UFW Firewall, Fail2ban & Web Services
Deployment Overview
Deployed and hardened self-hosted Linux server instances designed for enterprise web hosting and secure administrative access. The configuration enforces strict attack-surface reduction by disabling root login, replacing password-based access with cryptographic SSH keys, establishing stateful UFW firewall boundaries, and isolating reverse-proxy web services behind encrypted network layers.
Server Architecture & Source Diagram
Hardened Edge & Service Isolation Layer
Core Security & Administration Pillars
Cryptographic Access Controls
Enforced public key-based SSH authentication while explicitly disabling password authentication and root user SSH access. Custom port bindings and strict cipher suites mitigate automated brute-force attempts.
Stateful Firewall & Rate Limiting
Configured UFW firewall policies adhering to default-deny inbound rules. Integrated Fail2ban log monitoring to dynamically block malicious IP addresses triggering repeated connection failures.
Nginx Web Services & TLS
Deployed Nginx as an optimized reverse proxy handling HTTP-to-HTTPS redirection, Let's Encrypt TLS certificate auto-renewals, and HTTP security header hardening (HSTS, CSP, X-Frame-Options).
Systemd & Resource Auditing
Configured automated systemd service recovery daemons, centralized journalctl logging, and disk usage alerting to maintain operational availability and system health.