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Docker Compose

Docker Compose

ℹ️

Use to startup multiple Docker containers at the same time.

compose.yaml

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Examples (opens in a new tab)

ℹ️

All configurations here are the same from the docker run command. Currently, I'm showing docker compose v2 instead of v1. So some syntax might be different due to some syntax already deprecated.

A default network is created for all the composed containers. that means all containers that are created will be automatically added to that network.

compose.yaml
name: apiapp
services:
  postgres:
    image: postgres:14
    networks:
      - db
    environment:
      POSTGRES_USER: sonar
      POSTGRES_PASSWORD: sonar
    volumes:
      - postgres_data:/var/lib/postgresql/data
  sonarqube:
    image: sonarqube:lts
    ports:
      - '9000:9000'
      - '9092:9092'
    networks:
      - db
    environment:
      SONAR_JDBC_URL: jdbc:postgresql://postgres:5432/sonar
      SONAR_JDBC_USERNAME: sonar
      SONAR_JDBC_PASSWORD: sonarpasswd
    depends_on:
      - postgres
  apiapplication:
    build: ./
    volumes:
      - /app/node_modules
      - ./app:/app
    depends_on:
      - postgres
  server:
    build:
      context: ./server # system look dir to search for Dockerfile
      dockerfile: Dockerfile.dev
networks:
  db:
volumes:
  postgres_data:

Additional;

  • If you want to specify -it in compose.yaml, you will have to specify these two fields (mandatory)
    • stdin_open: true - This service needs an open input connection
    • tty: true - Attaching this terminal
    • -it = stdin_open + tty
  • If you want to override the Dockerfile entrypoint, you can specify entrypoint within compose.yaml, then it will override the entrypoint in Dockerfile that is defined.

Commands

Reference (opens in a new tab)

Use docker compose instead of docker-compose.

List containers

docker compose ps

Build or rebuild containers

It only builds containers without starting it.

docker compose build

Create and start containers

Up = Build/rebuild + start

docekr compose up
docker compose up --build # rebuild containers (build images before starting containers)
docker compose -d up # running in backgound
docker compose -f <compose-file> up
docker compose up <service> <service> # start only a few service

Execute a command in a running container

By default, it will allocate a TTY by default, so you can straight away get an interactive prompt from this command docker compose exec apiservice bash.

docker compose exec <service-name> <commands>
docker compose exec -it apiservice bash # old version
docker compose exec apiservice bash # new version

Display service log output

docker compose logs

Stop services

Stop running containers without removing them. The services can be started again with docker compose start.

docker compose stop

Stop and remove containers, networks

docker compose down
Resource LimitsUseful commands