Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You run docker-compose up and get an error like Error starting userland proxy:...

Node.js Heap Out of Memory in Production: Practical Fixes
You're running a Node.js application in production when it crashes with FATAL ERROR: In...

Fix Nginx Upstream Connection Refused & Upstream Not Found
When you see upstream connection refused or upstream not found in your ...

Fix Nginx Configuration Test Failure After Adding Proxy Pass
You add a proxy_pass directive to an Nginx server block, run nginx -t, ...

Fix Nginx Configuration Test Failure in Docker
When you run nginx -t inside a Docker container and get an error, the container usua...

Git Merge Unrelated Histories Without Losing Commits
You've cloned a repo, added a new remote, and now you need to merge two branches that don'...