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

Fix Nginx Upstream Connection Refused & Upstream Not Found

When you see upstream connection refused or upstream not found in your ...

How to Fix npm Permission Denied for Global Packages

When you run npm install -g and see EACCES: permission denied, it usual...

How to Merge a Git Detached HEAD Back to Master

If you see a message like 'You are in 'detached HEAD' state' after checking out a...

Fix Docker Container Exits Immediately After Start

You run docker run myimage and the container stops almost instantly. This is a commo...

Git Push Rejected Non Fast Forward: Troubleshooting Checklist