Docker Compose

Overview

This project runs a multi-service application using Docker Compose. It connects an application, database, and cache in a single setup, making local development and deployment consistent.

The goal is to ensure all services start together and work in the same environment every time.

Stack

• Docker

• Docker Compose

• Node.js (App)

• PostgreSQL

• Redis

Architecture

App → Database (PostgreSQL)
App → Cache (Redis)
All services connected via Docker network

Step 1: Dockerfile (App)

FROM node:18-alpine

WORKDIR /app

COPY package.json ./
RUN npm install

COPY . .

EXPOSE 3000

CMD ["npm", "start"]

Step 2: Docker Compose File

version: "3"

services:
  app:
    build: .
    ports:
      - "3000:3000"
    depends_on:
      - db
      - cache

  db:
    image: postgres
    environment:
      POSTGRES_PASSWORD: password
    ports:
      - "5432:5432"

  cache:
    image: redis
    ports:
      - "6379:6379"

Step 3: Run Application

docker-compose up -d

Step 4: Check Services

docker ps

Result

• App, database, and cache run together

• One command starts all services

• Same environment for all developers

• Easy local testing and setup

Key Points

• Simplifies multi-service setup

• Removes manual configuration

• Ensures consistent environments

• Ideal for development and testing

Final Note

This project shows how multiple services can run together using containers.

Instead of managing each service separately, everything is defined and started in one place, making development faster and more reliable.