Throughout the previous chapters, our Blog application has grown from a simple three-tier architecture to a multi-tier one. We now need to address a web server, database, cache system, and queue. We are going to define each of these layers as Docker containers.
First, let's begin with our web server and Flask application. For this, we will be using an Nginx frontend, and a WSGI, called uWSGI, for the backend.
A Dockerfile is a text file that contains special instructions with which we use to specify our Docker image and how it should be run. The build process is going to execute the commands one by one, creating a new layer on each one. Some of the most used Dockerfile commands include the following:
- FROM: Specifies ...
