Docker Compose is a tool that allows users to define and run multi-container Docker applications. It allows defining services in a docker-compose.yml file so they can run together in an isolated environment. The three steps to using Docker Compose are: 1) Define the app environment with a Dockerfile, 2) Define services in docker-compose.yml, and 3) Run docker-compose up to start the entire application.

1. docker-compose
A guide by Alex Fernandez

2. docker-compose
Compose is a tool for defining and running multi-
container Docker applications.
Compose is great for development, testing, and staging environments, as
well as CI workflows.

3. Features
1. Multiple isolated environments on a single host
2. Preserve volume data when containers are created
3. Only recreate containers that have changed
4. Variables and moving a composition between environments

4. Using docker-compose is a
3-way step

5. 1. Define your app’s environment with
a Dockerfile so it can be reproduced
anywhere.

6. 2. Define the services that make up
your app in docker-compose.yml so
they can be run together in an
isolated environment.

7. 3. run docker-compose up
and Compose will start and
run your entire app.

8. Reference!
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