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Docker Compose

Docker Compose is a tool that allows you to define and run multi-container Docker applications. It is used for orchestrating complex applications that consist of multiple services running in separate containers.

The Compose file is written in YAML format and defines the configuration of your application's services, networks, and volumes. You can use Docker Compose to start, stop, and manage your containers as a single unit.

To use Docker Compose to orchestrate multiple containers, you'll need to follow these steps:

  • Install Docker Compose: Docker Compose is a separate tool that needs to be installed on your machine. You can follow the installation instructions for your specific operating system from the official Docker documentation.
  • Create a Docker Compose file: You will need to create a docker-compose.yml file that defines the configuration of your application. Here's an example of a simple Compose file that defines two services, a web server and a database:
yaml
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version: '3'
services:
  db:
    image: postgres
    environment:
      POSTGRES_PASSWORD: example
  web:
    build: .
    ports:
      - "5000:5000"
    depends_on:
      - db

This Compose file defines two services, db and web. The db service uses the postgres image and sets the POSTGRES_PASSWORD environment variable. The web service builds an image from the current directory and maps port 5000 on the host to port 5000 in the container. It also depends on the db service.

  • Start the containers: To start the containers defined in the Compose file, run the following command:
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docker-compose up

This command will start the containers in the foreground and display the logs from all the containers.

  • Stop the containers: To stop the containers, run the following command:
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docker-compose down

This command will stop and remove the containers, networks, and volumes defined in the Compose file.

With these steps, you can use Docker Compose to orchestrate multiple containers for your application. The Compose file can be modified to add more services, volumes, and networks as needed.



Next: Docker Networking

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