Can you explain what components Docker consists of and how they interact?

Docker consists of several key components that interact to create, run, and manage containers:

1. Docker Engine — the core engine, which includes:

   • Docker Daemon (dockerd) — a background process that manages containers, images, networks, and volumes.
   • Docker CLI — a command-line interface for interacting with the Docker Daemon.

2. Images — templates that contain everything needed to run a container: code, libraries, dependencies, and configurations. Images are immutable and are created based on a Dockerfile.

3. Containers — running instances of images. Containers are isolated from each other and from the host, but share the host's kernel.

4. Docker Hub and other registries — storage for images, from which you can download or upload your images.

5. Dockerfile — a text file with instructions for building an image.

Interaction:

• The user sends commands to Docker Daemon via Docker CLI.
• Docker Daemon builds images from Dockerfile or runs containers from images.
• Containers operate in isolation, using host resources.

Example: when starting a container, the command docker run is sent to Docker Daemon, which creates and runs a container based on the specified image.