Infrastructure, Security & Digital Engineering

I am Dan Fry, a Systems Administrator and Cybersecurity Engineer based in the UK with over two decades of hands-on experience keeping production servers online, hardening networks, and building practical automation tools. This site is my open technical workbook — documenting real-world fixes, infrastructure postmortems, and engineering build logs from my homelab and enterprise environments.

The core focus here centres on Linux server administration (Debian, Ubuntu, and Proxmox virtualization), hosting infrastructure, containerized deployments, and mail deliverability setups using Postfix, SPF, DKIM, and DMARC. When services break, mail queues back up, or background daemon processes fail, I document the exact terminal commands, configuration files, and debugging steps used to fix them.

You will also find practical guides on cybersecurity auditing (SSH security, intrusion detection, firewall automation, and vulnerability scanning), modern autonomous AI agent workflows, and DIY homelab hardware projects. Alongside infrastructure engineering, I regularly cover dedicated game server hosting, multiplayer network architecture, and Linux gaming performance optimization.

Everything shared here is built on verified, working code and deterministic configuration. Feel free to explore articles by category below, test commands in the interactive terminal widget, or grab any scripts for your own infrastructure.