Docker

 

A container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. A Docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.

Docker Desktop

• Docker daemon
  
• CLI
  
• GUI

Docker Engine

Container: A lightweight, standalone, and executable package that includes everything needed to run a piece of software.

Image: Think of this as a template or blueprint for containers. It contains all the instructions needed to create a container.

Docker Hub: Like GitHub but for Docker images - it's where you can find and share container images.

Docker Engine: The core technology that runs and manages containers on your machine.

This diagram shows that:

The Docker Engine runs containers

Images are used to create containers

Docker Hub stores images

The Docker Engine can pull images from Docker Hub and push images to Docker Hub

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docker images  # list local images

docker run hello-world

docker pull hello-world   #pull hello-world image from Docker Hub

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