docker compose learning

This repository is for demo how to use docker compose

demo with mongo and mongo-express

1 architecture diagram

2 with docker command

1. create bridge network for container communication

docker network create mongo-network

2. ls current network created

docker network ls

3. run mongo over mongo-network

docker run -d \
-p 27017:27017 \
-e MONGO_INITDB_ROOT_USERNAME=admin \
-e MONGO_INITDB_ROOT_PASSWORD=supersecret \
--network mongo-network \
--name mongodb \
mongo

4. run mongo-express over mongo-network

docker run -d \
-p 8081:8081 \
-e ME_CONFIG_MONGODB_ADMINUSERNAME=admin \
-e ME_CONFIG_MONGODB_ADMINPASSWORD=supersecret \
-e ME_CONFIG_MONGODB_SERVER=mongodb \
--network mongo-network \
--name mongo-express \
mongo-express

docker log for check mongo-express default user/password

3 with docker-compose

1. create docker-compose.yml

networks:
  mongo-network:
    driver: bridge
    name: mongo-network
services:
  mongodb:
    image: mongo:latest
    container_name: mongodb
    environment:
      MONGO_INITDB_ROOT_USERNAME: admin
      MONGO_INITDB_ROOT_PASSWORD: supersecret
    networks:
      - mongo-network
    ports:
      - 27017:27017
    healthcheck:
      test: echo 'db.runCommand("ping").ok' | mongosh mongodb://admin:supersecret@localhost:27017/ --quiet
      interval: 5s
      timeout: 10s
      retries: 3
  mongo-express:
    image: mongo-express:latest
    container_name: mongo-express
    environment:
      ME_CONFIG_MONGODB_ADMINUSERNAME: admin
      ME_CONFIG_MONGODB_ADMINPASSWORD: supersecret
      ME_CONFIG_MONGODB_SERVER: mongodb
    depends_on:
      mongodb:
        condition: service_healthy
    networks:
      - mongo-network
    ports:
      - 8081:8081 

2. use docker compose command to start

docker compose up -d

add web app connect with mongodb

This app will directly load data from mongodb

mkdir app

server.js

target

add new container setup on docker-compose.yml

  app:
    build:
      context: .
      dockerfile: ./app/Dockerfile
      target: prod
    container_name: web-app
    image: web-app
    networks:
      - mongo-network
    environment:
      MONGO_DB_USERNAME: admin
      MONGO_DB_PWD: supersecret
    ports:
      - 3000:3000
    depends_on:
      mongodb:
        condition: service_healthy

for security issue: set those secret with environment variable

1. use environment to inject credential data

  environment:
    MONGO_INITDB_ROOT_USERNAME: ${MONGO_DB_ADMIN_USER}
    MONGO_INITDB_ROOT_PASSWORD: ${MONGO_DB_ADMIN_PASSWD}

use docker compose secret to inject secret

services:
  myapp:
    image: maapp:latest
    secrets:
      - my_secret
secrets:
  my_secret:
    file: ./my_secret.txt