here is an example, https://github.com/visualex/docker-boilerplate-nginx-apache-php-mysql https://github.com/visualex/docker-boilerplate-nginx-apache-... not u

here is an example, https://github.com/visualex/docker-boilerplate-nginx-apache-php-mysql https://github.com/visualex/docker-boilerplate-nginx-apache-... not using FPM but Apache, but you can see how nginx fits into the picture, you would be doing something like a fastcgi_pass testsite:9000; using the names in the referenced repo.