What is Docker?
Docker is a platform for developing, shipping, and running applications in containers. Containers package your application with all its dependencies, ensuring it runs consistently across different environments.
Dockerfile Best Practices
Writing efficient Dockerfiles is crucial for smaller image sizes and faster builds. Use multi-stage builds, minimize layers, and leverage build cache effectively.
FROM node:18-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build
FROM node:18-alpine
WORKDIR /app
COPY --from=builder /app/dist ./dist
COPY package*.json ./
RUN npm ci --production
CMD ["node", "dist/index.js"]Docker Compose for Development
Docker Compose simplifies running multi-container applications. Define your services, networks, and volumes in a single YAML file.