1.0 Simplified Docker Architecture

Docker or correctly, Docker Engine (Docker runtime) is:

• Docker Server: The Docker Daemon (dockerd) exposing a REST API. This daemon can co-ordinate with other daemons to manage images, containers, networks and volumes.
• Docker Client: A CLI which takes docker commands and talks to the Docker server

Additionally, you need

• Docker Registry: Storage for docker images. You can use a managed registry like https://hub.docker.com/ or host a private registry. Docker Daemon first searches for the image in it's local cache and then attempts to reach whatever registry is configured to host the Images.
• 

Image: https://docs.docker.com/engine/docker-overview/#docker-engine

Following image shows typical interaction when you execute a docker commandImage: https://docs.docker.com/engine/docker-overview/#docker-architecture

Exercise 1

1. What are the docker commands available?
2. Find the docker version.