Why use a current symlink?	It lets a deploy switch atomically and makes rollback simpler.	topicladder software linux
What does the 'Separate releases from current' step prove?	Use timestamped release folders and a current symlink to make rollback possible. Check: readlink -f current shows the active release.	topicladder software linux
What does the 'Know the document root' step prove?	The root directive tells Nginx which folder becomes the web root. Check: The requested URL maps to a file under root.	topicladder software linux
What does the 'Test before reload' step prove?	Nginx can validate syntax before traffic changes. Check: nginx -t must pass before systemctl reload nginx.	topicladder software linux
What does the 'Verify from outside' step prove?	curl checks the public path, not just local files. Check: HTTP 200 and expected text confirm the page served.	topicladder software linux
When would you use `sudo nginx -t`?	Use it to test nginx configuration. Expected signal: syntax is ok and test is successful	topicladder software command
When would you use `readlink -f /srv/www/site/current`?	Use it to show the active release folder. Expected signal: A timestamped release path	topicladder software command
When would you use `curl -I https://example.com/`?	Use it to check public response headers. Expected signal: HTTP/2 200 or HTTP/1.1 200	topicladder software command