Workflow manuals for setup steps, repeatable tasks, and software operations.

Docker Container Exits Immediately: Diagnosing Out of Memory

You start a Docker container and it exits within seconds. The logs show nothing obvious, or they ...

Cloudflare 521 Error: Troubleshooting and Fixes

When you see a 521 Web Server Is Down error, it means Cloudflare cannot establis...

Fix DNS Probe Finished NXDOMAIN on Custom DNS Server

If you see “DNS PROBE FINISHED NXDOMAIN” in Chrome or another browser while using a custom DNS se...

Fix Cloudflare Origin Certificate Mismatch Errors

If you see 'Origin Certificate Mismatch' in Cloudflare or browser warnings, it usually me...

Fix Git index.lock File Exists Permission Denied Error

You're in the middle of a Git operation and suddenly you see:

fatal: Unable to ...