Docker and Kubernetes

Chapter 3: Docker Images and Containers

3.1 Understanding Images

Images are read-only templates used to create containers.

Image Layers:

• Images consist of multiple layers
• Layers are cached for efficiency
• Only changed layers are rebuilt

3.2 Working with Containers

Containers are running instances of images.

# Run container
docker run -d -p 8080:80 nginx

# Execute command in container
docker exec -it container_id bash

# View container logs
docker logs container_id

3.3 Image Management

docker build -t myapp:1.0 .    # Build image
docker tag myapp:1.0 myapp:latest  # Tag image
docker push myapp:1.0          # Push to registry
docker rmi image_id            # Remove image