Why Docker Matters
Docker eliminates the "works on my machine" problem by packaging applications with dependencies into portable containers.
Key Benefits
- Consistent Environments across all team members
- Easy Onboarding with a single
docker compose up - Production Parity — dev mirrors production
Docker Compose Example
version: "3.8"
services:
app:
build: .
ports:
- "3000:3000"
depends_on:
- db
db:
image: postgres:16
environment:
POSTGRES_DB: myapp
Multi-Stage Builds
Optimize images with multi-stage builds — build in one stage, copy artifacts to a slim production stage.
Best Practices
- Use
.dockerignore - Layer caching — copy package.json first
- Add health checks
- Run as non-root user
- Use Alpine images
Originally published on IceCat Studio Blog.