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Docker-compose Basics

Dockerfile​

Automating the process of downloading the image and starting the container on specified port and then setting up the database with specific script can be achieved with docker-compose.yml which written in yaml file. Below is a sample file to download postgres image and setup the database. The sql script should be provide in the sql_scripts directory. Follow the formatting required for yaml specification 

version: "3"

services:
  postgres:
    image: "postgres:14.5"
    restart: always
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: users
    logging:
      options:
        max-size: 10m
        max-file: "3"
    ports:
      - "5432:5432"
    volumes:
      - ./postgres-data:/var/lib/postgresql/data
      - ./sql_scripts/create_user_tables.sql:/docker-entrypoint-initdb.d/create_user_tables.sql

save the file as stack.yml

execute the docker-compose.yml file​

docker-compose -f stack.yml up

docker-compose mongo​

Example of docker-compose.xml file mongodb image on docker hub

# Use root/example as user/password credentials
version: "3.1"

services:
  mongo:
    image: mongo
    restart: always
    environment:
      MONGO_INITDB_ROOT_USERNAME: root
      MONGO_INITDB_ROOT_PASSWORD: example

  mongo-express:
    image: mongo-express
    restart: always
    ports:
      - 8081:8081
    environment:
      ME_CONFIG_MONGODB_ADMINUSERNAME: root
      ME_CONFIG_MONGODB_ADMINPASSWORD: example
      ME_CONFIG_MONGODB_URL: mongodb://root:example@mongo:27017/

deploy with docker-compose​

docker-compose -f stack.yml up

deploy with docker​

docker stack deploy -c stack.yml mongo

container interactive shell​

docker exec -it some-mongo bash