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docker_compose.md

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Docker compose

Docker compose is a separate program, which extends the docker command. Docker compose deals with higher-level view where docker images are combined into bigger architectures. The definition of the architecture is specified with YAML files, usually called docker-compose.yaml (though there is no rule):

version: "3"                # Version of docker
services:                   # Containers to spin up
    my_node:                # Name of an image
        image: node:latest
        port: "8888:80"     # Port forwarding
    proxy:
        image: nginx:latest
        port: 8080
networks:                   # Network to setup between the containers and the host
    ...

The command for operating with docker compose is docker-compose or docker compose.

Basic operations

To compile images described in docker-compose yaml files use:

docker compose build [image_name] # build images from docker-compose files
docker compose up [image_name] # optionally build and run an image
docker-compose down [image_name] # stop containers

All containers and images can be controled by standard docker command. docker compose is more user-friendly since it associates, [image_name] with the id of the container/image using the docker-compose.yaml file in cwd.