How to run Nginx within a Docker container without halting?

To expand on Charles Duffy’s answer, Nginx uses the daemon off directive to run in the foreground. If it’s inconvenient to put this in the configuration file, we can specify it directly on the command line. This makes it easy to run in debug mode (foreground) and directly switch to running in production mode (background) by changing command line args.

To run in foreground:

nginx -g 'daemon off;'

To run in background:

nginx

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