Docker Compose Basics

Running multiple containers using docker-compose

Create my-docker-compose.yml file with the following contents:


################
version: '2'
networks:
  main:

services:
  my-postgres:
    container_name: my-postgres
    image: "postgres:9.4.8"
    ports:
      - "5432:5432"
    environment:
      - "POSTGRES_USER=myuser"
      - "POSTGRES_PASSWORD=superpassword"
    networks:
      main:
        aliases:
          - my-postgres
  my-mongo:
    container_name: my-mongo
    image: "mongo:3.2"
    ports:
      - "27017:27017"
    networks:
      main:
        aliases:
          - my-mongo
################

Pull the images

docker-compose -f ./my-docker-compose.yml -p mydockerproject pull

Start the containers

docker-compose -f ./my-docker-compose.yml -p mydockerproject up --build -d

Test Mongo DB container

docker run --network=mydockerproject_main -it --rm mongo:3.2 sh -c 'exec mongo "my-mongo:27017/local"'

Type 'exit' to quit

Test Postgres DB container

docker run --network=mydockerproject_main -it --rm postgres:9.4.8 psql --host my-postgres --username myuser --dbname myuser --port 5432

Password for user myuser: superpassword

Type '\q' to quit the terminal and container

Stop the containers

docker-compose -f ./my-docker-compose.yml -p mydockerproject down -v

Inspect Networks and Containers

docker network ls -q | xargs docker network inspect

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