Docker architecture (client, daemon, registry) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the role of the Docker Client in Docker architecture?

The Docker Client is the user interface that accepts commands from users and sends them to the Docker Daemon to execute. It acts like a remote control for Docker.

beginner

Explain the Docker Daemon and its function.

The Docker Daemon runs on the host machine and manages Docker objects like containers, images, networks, and volumes. It listens for commands from the Docker Client and performs the requested actions.

beginner

What is a Docker Registry and why is it important?

A Docker Registry is a storage and distribution system for Docker images. It allows users to share and download images. Docker Hub is a popular public registry.

intermediate

How do the Docker Client and Docker Daemon communicate?

They communicate through REST API calls over a socket or network interface. The client sends commands, and the daemon executes them.

intermediate

Describe the flow when you run 'docker run' command.

The Docker Client sends the 'run' command to the Docker Daemon. The daemon checks if the image exists locally or pulls it from the Registry. Then it creates and starts the container.

Which component in Docker architecture listens for commands and manages containers?

A Docker Daemon

B Docker Client

C Docker Registry

D Docker Compose

The Docker Daemon listens for commands from the client and manages containers and other Docker objects.

Where are Docker images stored for sharing and downloading?

A Dockerfile

B Docker Daemon

C Docker Client

D Docker Registry

Docker Registry stores Docker images so users can share and download them.

How does the Docker Client communicate with the Docker Daemon?

A Direct file access

B Through REST API calls

C Using SSH only

D Via Docker Registry

The Docker Client sends commands to the Docker Daemon using REST API calls over a socket or network.

What happens if the Docker Daemon does not find an image locally when running a container?

A It pulls the image from the Docker Registry

B It asks the Docker Client to build the image

C It throws an error and stops

D It creates a new image automatically

The Docker Daemon pulls the image from the Docker Registry if it is not found locally.

Which of these is NOT part of Docker architecture?

A Docker Client

B Docker Daemon

C Docker Kernel

D Docker Registry

Docker Kernel is not a component; Docker uses the host OS kernel but does not have its own kernel.

Describe the roles of Docker Client, Docker Daemon, and Docker Registry in Docker architecture.

Think about who talks, who does the work, and where images are kept.

Explain the process that happens when you run a Docker container using 'docker run'.

Follow the command from user input to container start.