The Complete Practical Docker Guide - Express Web Server Using Node

The video tutorial guides viewers through running a Node.js application in a Docker container, setting up an Express application, and installing necessary packages using NPM. It covers executing the app, handling errors, and mapping ports to verify the app's functionality. The tutorial emphasizes using Docker for package management and application execution.

What is the first step in creating a more complex Node.js application with Docker?

• Download the Express package

• Run the application using Node.js

• Install Docker on the local machine

• Create a new folder and file for the application

What does NPM stand for in Node.js?

• New Project Manager

• Node Package Manager

• Node Program Module

• Network Protocol Manager

Why might you encounter a 'module not found' error when running a Node.js application?

• The application is not saved

• The Node.js version is outdated

• The required module is not installed

• The Docker container is not running

What command is used to initialize a Node.js project?

• npm run

• npm init

• npm install

• npm start

What files are created when you initialize a Node.js project with NPM?

• package.json and package-lock.json

• index.js and server.js

• app.js and config.js

• Dockerfile and docker-compose.yml

How can you execute NPM commands inside a Docker container?

• By using a virtual machine

• By using a different programming language

• By overriding the default command with a custom one

• By installing NPM locally

What is the significance of the package-lock.json file?

• It contains the application's source code

• It locks the application from unauthorized access

• It records the exact versions of installed packages

• It is used to start the application

What is the purpose of port mapping in Docker?

• To increase application speed

• To reduce memory usage

• To connect the application to the internet

• To allow external access to the application

What message indicates that the Express application is running successfully?

• Error: Cannot find module

• Command not found

• Application terminated unexpectedly

• This express app was executed by node JS container inside of the Docker

What should you do if you cannot connect to the Express server on port 3000?

• Update the Express package

• Reinstall Node.js

• Restart the Docker container

• Check if the port is mapped correctly