Build a Multi-Container App with Docker Compose (Flask + Redis) Tutorial
In this tutorial, we walk through creating a multi-container application using Docker Compose. You’ll see how to:
Set up a project directory with a Flask web app and a Redis backend;
Isolate dependencies using requirements.txt and build a custom Docker image from a Dockerfile;
Configure services in a docker-compose.yml file, defining networking, volumes, and service dependencies;
Launch containers in detached mode, automatically building the Flask image and pulling Redis;
Inspect running services, view logs in real-time, and test the app using curl to increment a visit counter;
Manage containers with start, stop, restart, and down commands;
Scale services by updating the YAML file and enabling dynamic port mapping;
Whether you're new to Docker or brushing up your skills, this guide can help you deploy and scale your apps with confidence.