Advanced & Deep Dives

Topics for when the basics aren't enough — the tools and techniques you grow into as you run more (and more important) systems.

• Network Diagnostics Deep-Dive — ss, traceroute, mtr, and tcpdump: see exactly what's on the wire and where a connection breaks.
• Analyzing Log Files — read and mine the real logs (nginx, PHP-FPM, messages/syslog, secure/auth) with grep/awk, rank offenders, and summarise web traffic with GoAccess.
• Infrastructure as Code: Terraform Basics — declare infrastructure as code with Terraform (and OpenTofu), with a runnable example.

Prerequisites

These build on the earlier stages — especially Networking, Logs & journald, and Automation. Comfortable there? Dive in.