Patrick Tierney
Systems Administration | Networking | Infrastructure
B.S. Computer Information Systems Candidate (3.9 GPA)
Professional Portfolio
This site documents personal infrastructure projects and software tools developed as part of my work in information technology and system administration. This portfolio is hosted on a self-hosted Linux server and is deployed through a containerized web server as part of a broader environment used for testing and operating self-hosted services.
Homelab Infrastructure
A central project I maintain is a self-hosted Linux server used to run multiple services in a containerized environment.
Systems Administration & Storage
The server environment is built on Ubuntu Server and utilizes Logical Volume Management (LVM) to provide modularity and data isolation across the physical storage layer. This setup allows for dedicated volumes for different service tiers:
- NAS Storage: Dedicated drive for general network assets and internal file sharing.
- Private Vault: An isolated volume specifically allocated for sensitive data synchronization via Nextcloud.
Network & Container Security
Security is managed through a "Least Privilege" model, focusing on reducing the attack surface of the internal network.
- Firewall Hardening (iptables): I specifically implemented
iptablesfor host-level traffic filtering because Docker ignores UFW. By default, Docker manipulates the kernel'sPREROUTINGchain, allowing container traffic to bypass standard UFW rules. Using iptables directly ensures firewall policies are enforced at the kernel level. - Zero-Trust Remote Access: External access is handled through an encrypted Cloudflare Tunnel rather than NAT port forwarding. This allows services to be accessed through a domain while the host remains inaccessible from the public internet.
- DNS Filtering: A Pi-hole instance provides network-wide DNS-level filtering to block malicious domains and telemetry.
Current Self-Hosted Services
- Nextcloud: Private cloud storage
- Rocket.Chat & Jitsi: Private messaging and video conferencing
- Netdata: Real-time system monitoring
- Nginx: High-performance web server hosting this portfolio
Software Projects
SecurePassGen
A Python password generation utility designed to produce randomized passwords using configurable character sets.
- Developed with Tkinter for a graphical user interface.
- Features adjustable length and complexity algorithms.
- Repository: github.com/Mauserman98/SecurePassGen
Education & Credentials
Associate of Applied Science – IT & Networking
DeVry University | Graduated with Honors – August 30, 2025
Bachelor of Science – Computer Information Systems
Concentration: Information Systems Security
Expected Graduation 2027 | Current GPA: 3.9 / 4.0