Module 1: Docker Mastery

1.1 Images and Containers

Images: Read-only templates used to create containers. They are built from a Dockerfile.

Containers: Runnable instances of an image. They isolate the application from the host system.

1.2 Dockerfile Best Practices

Writing efficient Dockerfiles is crucial for security and performance.

• Use multi-stage builds to reduce image size.
• Minimize the number of layers by combining commands.
• Use specific tags (e.g., node:14-alpine) instead of latest.
• Run as a non-root user for security.

1.3 Docker Compose

Docker Compose is a tool for defining and running multi-container Docker applications. You use a YAML file to configure your application's services.

version: '3'
services:
  web:
    build: .
    ports:
      - "5000:5000"
  redis:
    image: "redis:alpine"

1.4 Networking and Volumes

Networking: Allows containers to communicate with each other and the outside world.

Volumes: Persist data generated by and used by Docker containers.