DevOps Guides
DevOps in practice is mostly debugging things that worked in staging and broke in production, and writing the automation that prevents you from having to debug them twice.
These guides are operational, not aspirational. They start from the point where you have a broken systemd service, a Docker container that exits with code 1, or a monitoring alert that fired and you need to understand what it's telling you.
The scope covers systemd, Docker, log management, and common monitoring patterns — with emphasis on understanding what went wrong and fixing it fast.
8 articles
systemctl Service Not Starting: Complete Fix Guide
Fix systemctl service not starting — diagnose failed units, read exit codes, resolve dependency errors, and fix the most common reasons a Linux service won't start.
systemctl Restart Service Not Working: Fix Guide
Fix systemctl restart not working — diagnose failed units, read journal logs, handle dependency failures, and resolve the most common systemd service restart failures.
Linux Check Running Services with systemctl: Real Examples
Check running services in Linux using systemctl — list active units, find failed services, check service status, and filter by type with real command examples.
journalctl Filter by Time Range: Real Examples
Filter journalctl output by time range, unit, priority, and keyword — with real command examples for production incident investigation and log triage.
Docker Inspect Container IP Address: Step-by-Step
Get a Docker container's IP address using docker inspect, docker exec, and network commands — with real examples for bridge, host, and custom networks.
Docker Container Not Starting: Fix Guide
Fix Docker container not starting — diagnose exit codes, read container logs, resolve port conflicts, permission errors, and OOM kills in production.
Docker Ate My Disk: Fixing Log Rotation Before It Kills Production
How a single verbose container filled a 500GB disk in 72 hours, and the exact daemon.json config that stops it from ever happening again.
Docker Networking Demystified: bridge, host, and overlay
The three Docker network modes that matter for production — what they actually do, when to use each, and the gotchas that'll bite you if you pick the wrong one.