Docker containerization for Node.js in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Docker containerization in simple terms?

Docker containerization means putting your app and everything it needs into a small, portable box called a container. This box can run anywhere without changing anything.

beginner

Why use Docker for a Node.js app?

Docker helps run your Node.js app the same way on any computer or server. It avoids problems like missing files or different software versions.

beginner

What is a Dockerfile in Node.js projects?

A Dockerfile is a simple text file with instructions to build a Docker container. It tells Docker how to set up your Node.js app inside the container.

intermediate

How do you start a Node.js app inside a Docker container?

You write a command in the Dockerfile like CMD ["node", "app.js"]. This tells Docker to run your app when the container starts.

beginner

What is the role of npm install in a Dockerfile for Node.js?

It installs all the app's needed packages inside the container so your Node.js app has everything to run properly.

What does a Docker container include for a Node.js app?

A Only Node.js runtime

B Only app code

C App code, Node.js runtime, and dependencies

D Only system files

A Docker container bundles your app code, the Node.js runtime, and all dependencies so it runs anywhere.

Which file tells Docker how to build a Node.js container?

A package.json

B index.js

C README.md

D Dockerfile

The Dockerfile contains instructions to build the container for your Node.js app.

What command is used inside a Dockerfile to install Node.js packages?

A npm install

B npm run

C node install

D npm start

npm install installs all dependencies listed in package.json inside the container.

How do you run your Node.js app when the Docker container starts?

A Using CMD or ENTRYPOINT in Dockerfile

B By running npm install

C By opening a terminal inside container

D By editing package.json

The Dockerfile uses CMD or ENTRYPOINT to specify the command to run your app when the container starts.

Why is Docker useful for sharing Node.js apps?

A It makes apps run slower

B It ensures apps run the same everywhere

C It removes the need for Node.js

D It only works on Windows

Docker packages apps so they run the same on any computer or server, avoiding setup problems.

Explain how you would create a Docker container for a simple Node.js app.

Think about the steps to prepare the app and tell Docker how to run it.

Describe the benefits of using Docker containerization for Node.js development and deployment.

Focus on how Docker helps with app reliability and portability.