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By Kevin McAleer, 3 Minutes
Docker Compose files are YAML files that describe a multi-container application. Writing an effective Docker Compose file is a foundational skill for deploying applications in both development environments and production Docker Swarms. This lesson will walk you through creating a basic Docker Compose file to define a simple web application stack.
A Docker Compose file is structured into several sections, including services, networks, and volumes, each defining different aspects of your application:
services
networks
volumes
Here’s a simple example of a Docker Compose file that defines a web application and a database service:
version: '3.8' services: web: image: nginx:latest ports: - "80:80" depends_on: - db networks: - webnet db: image: postgres:latest environment: POSTGRES_PASSWORD: example volumes: - db-data:/var/lib/postgresql/data networks: - webnet networks: webnet: volumes: db-data:
3.8
web
db
<host>:<container>
webnet
db-data
Writing a Docker Compose file is an essential step in deploying containerized applications. By understanding and utilizing the key components of a Docker Compose file, you can effectively define, deploy, and manage complex applications with multiple interdependent services. This foundational knowledge will be invaluable as you progress to deploying and scaling applications across a Docker Swarm cluster.
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