By running Redis and Postgres in a Docker container, you don’t have to install or maintain the software on your local machine. Using Docker and defining your local development environment with Docker Compose provides you with a number of benefits: The following command confirms that all three containers are running: $ docker psĨe422ff92239 python_web "/bin/sh -c 'python a"Ĥac9ecc8a2a3 python_db "/docker-entrypoint.s"Ģcbc8febd074 redis:alpine "docker-entrypoint.sh" Now that the local development environment is defined in docker-compose.yml, you can spin up all three services with one command: $ docker-compose up This section defines our Redis service, which opens port 6379 and uses the official Redis image on Docker Hub. The next service is the Postgres database, which opens port 5432 and uses the latest official Postgres image on Docker Hub. env, and mounts our local code directory as a volume. It opens port 5000, sets environment variables defined in. The first section defines the web service. The following is the docker-compose.yml for the application: Everything is defined in docker-compose.yml, which is used by the docker-compose CLI. You can use Docker Compose to define your local development environment, including environment variables, ports you need accessible, and volumes to mount. 
With Docker, the web frontend, Redis, and Postgres each run in a separate container. This example app is comprised of a web frontend, Redis for caching, and Postgres as our database.
Let’s start out with a simple python-based multi-container application. In this article you’ll learn why Docker Compose is great for local development, how you can push your Docker images to Heroku for deployment, and Compose tips and tricks. Docker Compose is a tool for defining and running a multi-container Docker application.
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