How do you change the Nginx document root safely?

What this card says

Short answer

Edit the root in the server block, run sudo nginx -t, then sudo service nginx reload.

Example

If the test fails, fix the config first; do not reload. On enforcing SELinux, the new folder may need the right context.

Say it in the interview

“Change the root, config-test, then reload, and fix SELinux context if needed.”

Why it matters

Reloading a broken config takes the site down, so the test step is not optional.