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Node.js Dockerized App

Building a Dockerized App

Node.js Dockerized app uses Dockerfile for containerized deployment.

Introduction to Dockerizing a Node.js App

Dockerizing a Node.js application involves creating a Docker container that encapsulates your app and its environment. This ensures consistency across different deployment environments, such as development, testing, and production. In this guide, you will learn how to set up and deploy a Dockerized Node.js application using a Dockerfile.

Prerequisites

Before you begin, make sure you have the following installed on your machine:

  • Node.js and npm
  • Docker and Docker Compose

Creating a Simple Node.js Application

Let's start by creating a simple Node.js application. Open a terminal and create a new directory for your project:

Initialize a new Node.js project:

Create a new file named app.js and add the following code:

Writing a Dockerfile

With your Node.js app ready, the next step is to create a Dockerfile that will describe how to build a Docker image for your application. Create a new file named Dockerfile in your project directory and add the following content:

Building and Running the Docker Container

Now that you have a Dockerfile, you can build and run your Docker container. Execute the following command in your terminal to build the Docker image:

Once the build is complete, run the container using the command below:

Your Node.js application is now running inside a Docker container. You can access it by navigating to http://localhost:3000 in your web browser. You should see "Hello World" displayed on the page.

Conclusion

Dockerizing your Node.js application provides a powerful way to ensure your app runs consistently across different environments. By following the steps in this guide, you have learned how to create a Dockerfile, build a Docker image, and run a Node.js app inside a Docker container.

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