Stopping and Removing Services

5.1 Command docker compose down

The docker compose down command is used to stop and remove all resources created by the docker compose up command. This includes stopping containers, removing networks and volumes (if specified), and optionally removing images. In this lecture, we'll dive into how to use the docker compose down command, its main options, and best practices.

Main Functions of the docker compose down Command

1. Stopping containers: all containers launched with docker compose up will be stopped.
2. Removing containers: stopped containers will be deleted.
3. Removing networks: networks created by Docker Compose to enable communication between containers will be deleted.
4. Removing volumes: you can optionally remove volumes used by containers.
5. Removing images: you can optionally remove the images used to create the containers.

Syntax for the docker compose down Command

docker compose down [options]

Where:

• [options]: additional parameters to configure the command's behavior. For example:
  • --volumes: removes volumes used by the containers.
  • --rmi all: deletes all images associated with the project.
  • --rmi local: deletes only local images that were not pulled from a registry.

5.2 Examples of the docker compose down Command

Examples of using the docker compose down command:

1. Stopping and removing all resources

To stop and remove all resources created by the docker compose up command, use the following command:

docker compose down

2. Removing volumes

To remove volumes used by containers, add the option --volumes:

docker compose down --volumes

3. Removing images

To remove images used to create containers, add the --rmi option with one of the following values:

• all: remove all images used by the project.
• local: remove only locally built images.

docker compose down --rmi all

5.3 Parameters of the docker compose down Command

Useful parameters for the docker compose down command:

1. Parameters -v, --volumes

The -v and --volumes parameters delete all volumes created and used by the services. Use with caution, as this will remove all data stored in these volumes.

docker compose down --volumes

2. Parameter --rmi

The --rmi parameter removes images used to create containers. The following values are supported:

• all: removes all images used by the project.
• local: removes only locally built images.

docker compose down --rmi all

3. Parameter --remove-orphans

The --remove-orphans parameter removes containers that are not defined in the current compose.yaml file but were created by previous Docker Compose runs.

docker compose down --remove-orphans

5.4 Practical Recommendations

1. Be cautious using the --volumes parameter

Deleting volumes with the --volumes option will result in losing all data stored in those volumes. Make sure you really want to delete that data before using this option.

2. Cleaning up unnecessary images

Using the --rmi all parameter is useful for clearing out all images to free up disk space. However, be careful not to delete images you might need in the future.

3. Automating cleanup

You can include the docker compose down command in automation scripts or CI/CD pipelines to automatically clean up resources after tests or deployments are done.

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Stopping all services

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