Docker simplifies application deployment by packaging code and dependencies into containers. Learn the basics to get started.

Docker Fundamentals

Containers vs VMs, Docker images, and containers. Use Dockerfile to define your app environment.

Building Images

Create a Dockerfile with FROM, RUN, COPY, and CMD. Build with docker build -t myapp ..

  • Multi-stage builds for smaller images.
  • Use .dockerignore to exclude files.
  • Tag and push to Docker Hub.

Running Containers

docker run -p 3000:3000 myapp to start. Use docker-compose for multi-container apps.

Best Practices

Minimize layers, use official base images, scan for vulnerabilities, and orchestrate with Kubernetes for production.

Docker ensures consistency. Containerize your app.