Docker Basics for Developers

Docker has revolutionized how we deploy and run applications. Let's learn the basics of containerization with Docker.

Core Concepts

• Containers
• Images
• Dockerfile
• Docker Compose

Example Dockerfile

# Base image
FROM node:18-alpine

# Set working directory
WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies
RUN npm install

# Copy source code
COPY . .

# Build application
RUN npm run build

# Expose port
EXPOSE 3000

# Start application
CMD ["npm", "start"]

Common Commands

1. docker build -t myapp .
2. docker run -p 3000:3000 myapp
3. docker-compose up
4. docker ps