Knowledge base for software setup, errors, and daily tool work.

How to Debug Docker Compose Environment Variables

When environment variables don't show up inside a container, the application often fails sile...

Fix Docker Desktop Engine Not Running on Windows

You open Docker Desktop on Windows, see the whale icon stuck in the system tray, and the engine s...

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM

You're seeing upstream connection refused in your Nginx error log, and your site...

How to Fix Cloudflare SSL Full Strict Self-Signed Certificate Error

Fix Node.js Heap Out of Memory in Docker Containers

If your Node.js application running in a Docker container crashes with a "JavaScript heap out...

Cloudflare 522 Error After Server Migration: Fixes That Work

If you've just migrated your website to a new server and now see a Cloudflare 522 error (conn...