I spent a fair amount of time last year on a pristine and robust Docker file, and while many of these have been shared, there seem few really well-annotated and explained files. So here we go … The service we are building here is a PHP / Laravel application served by Apache, all on Alpine. So it’s more complex than most services, and thus therein lies some lessons & practices — of course, your language and environment may differ. It’s also based on Alpine, a popular lightweight Linux OS that is very easy and cool to use, but not without its small challenges.