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Linux System Admin Reference — ps, ss, lsof, journalctl, strace, systemctl, df/du, and debugging


🖥️ Linux Admin & Debugging Reference

The commands you reach for when something’s wrong in production — ps, ss (not netstat), lsof, journalctl, systemctl, df/du, strace, /proc, and performance investigation patterns.



🔍 Free tool: HTTP Security Headers Analyzer — after configuring your web server, verify it’s returning the right HTTP security headers — HSTS, CSP, X-Content-Type — with an instant grade.

🔧 More free DevOps tools: Developer Utilities Hub — cron builder, CIDR calculator, K8s resource calculator, chmod tool, Nginx config generator, and more.