Docker basics review in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Docker in simple terms?

Docker is a tool that lets you package an application and all its parts into a container. This container can run anywhere, making it easy to move and share apps.

beginner

What is a Docker container?

A Docker container is like a small, lightweight box that holds your app and everything it needs to run. It keeps your app isolated from other apps on the same computer.

intermediate

What is the difference between a Docker image and a Docker container?

A Docker image is a blueprint or recipe for creating containers. A container is a running instance made from that image.

intermediate

Why is Docker useful in microservices architecture?

Docker helps by packaging each microservice in its own container. This makes it easy to develop, test, and deploy services independently without conflicts.

beginner

What is a Dockerfile and why do we use it?

A Dockerfile is a simple text file with instructions to build a Docker image. It tells Docker how to set up the app environment step-by-step.

What does a Docker container include?

A The app and all its dependencies

B Only the app code

C Only the operating system

D Only the network settings

A Docker container packages the app along with everything it needs to run, like libraries and dependencies.

Which file is used to build a Docker image?

A README.md

B docker-compose.yml

C config.json

D Dockerfile

A Dockerfile contains instructions to build a Docker image.

How does Docker help with microservices?

A By isolating each service in its own container

B By combining all services into one big app

C By replacing the need for servers

D By removing the need for code

Docker isolates each microservice in its own container, making development and deployment easier.

What is the main difference between a Docker image and a container?

A Image runs the app; container stores the app

B Image is a blueprint; container is a running instance

C Image is bigger than container

D There is no difference

A Docker image is a static blueprint, while a container is a live running instance created from that image.

Which command starts a Docker container?

A docker build

B docker stop

C docker run

D docker pull

The 'docker run' command starts a new container from an image.

Explain how Docker containers help in deploying microservices.

Think about how each microservice runs separately and can be managed on its own.

Describe the role of a Dockerfile in creating Docker images.

Imagine writing a recipe for baking a cake.