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

Docker Container Exits Immediately with Exit Code 137

You start a Docker container, and it exits almost immediately with exit code 137. This usually me...

Docker Compose Port Mapping: Fix Common Issues

You've defined a ports section in your docker-compose.yml, but the ...

How to Validate Nginx Configuration Before Reload

Reloading nginx with a broken configuration can take your site down. The safe way is to test the ...

Fix 'git pull failed index.lock file exists' Error

When running git pull, you may see an error like:

fatal: Unable to create &#...

Fix Nginx Configuration Test Failed on Ubuntu

When you run nginx -t on Ubuntu and get an error, Nginx won't reload or restart....

How to Fix Git Push Rejected (Non-Fast-Forward) Error

You run git push and get an error like ! [rejected] main -> main (non-fast-...