Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

After restarting your Docker containers, you might see a 502 Bad Gateway error when accessing you...

If your Nginx container shows a 502 Bad Gateway error, it usually means Nginx cannot...

If you see a FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of me...

Fixing Nginx Upstream Connection Refused and Permission Denied
If you see connect() failed (111: Connection refused) or connect() failed (13:...

Docker Nginx 502 Bad Gateway: Memory Limit Fix
You're running Nginx in Docker as a reverse proxy, and suddenly you see 502 Bad Gateway error...

Git index.lock File Exists Even After Deleting: Fixes
You delete the .git/index.lock file, but Git still says it exists. This can happen d...