Docker engine and runtime - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Docker Engine?

Docker Engine is the core software that builds, runs, and manages containers on your computer. It acts like a mini factory that creates and runs containerized apps.

beginner

What are the main components of Docker Engine?

The main parts are: 1) Docker Daemon (runs in background and manages containers), 2) Docker CLI (the command tool you use), and 3) REST API (lets other programs talk to Docker).

beginner

What does the Docker runtime do?

The Docker runtime is the part that actually starts and stops containers. It uses container technology to isolate apps so they run the same everywhere.

intermediate

How does Docker Engine use container technology?

Docker Engine uses OS features like namespaces and cgroups to create isolated spaces called containers. This keeps apps separate and controls their resource use.

beginner

Why is Docker Engine important for DevOps?

Docker Engine helps DevOps by making app deployment fast, consistent, and easy to manage. It lets teams build once and run anywhere without surprises.

What is the role of the Docker Daemon?

A It compiles Dockerfiles into code.

B It builds the Docker CLI interface.

C It manages containers and listens for Docker commands.

D It stores Docker images in the cloud.

The Docker Daemon runs in the background and manages container lifecycle and resources.

Which component do you use to run Docker commands?

A Docker CLI

B Docker Daemon

C Docker Hub

D Docker Compose

The Docker CLI is the command-line tool you use to interact with Docker Engine.

What technology does Docker use to isolate containers?

A Virtual machines

B Namespaces and cgroups

C Cloud servers

D Kubernetes pods

Docker uses OS features like namespaces and cgroups to isolate containers.

What happens when you run a container with Docker runtime?

A Docker compiles the app into machine code.

B Docker uploads the app to the cloud.

C Docker deletes the app from your system.

D Docker creates an isolated environment and starts the app inside it.

The Docker runtime creates an isolated container and runs the app inside it.

Why is Docker Engine useful in DevOps?

A It ensures apps run the same on any machine.

B It replaces all servers with virtual machines.

C It automatically writes code for developers.

D It only works on Windows systems.

Docker Engine provides consistent environments so apps behave the same everywhere.

Explain what Docker Engine is and how it works to run containers.

Think of Docker Engine as the engine of a car that powers container apps.

Describe the main components of Docker Engine and their functions.

Imagine the Docker CLI as the driver, the Daemon as the engine, and the API as the communication system.