Task 02 - Containerize the Node.js app

Introduction

In this task, you will be able to containerize the Node.js application created in the previous task to get it ready for registration in Azure Container Registry.

Description

In this task, you will be able to:

Create a dockerfile to setup the Node.js application for containerization.
Use Docker Desktop to build, tag and run the docker image.

Success Criteria

Successfully creating a dockerfile for the Node.js application.
Successfully building and tagging the the container image.
Successfully runing the container image to validate the application running from a container.

Solution

Expand this section to view the solution

Create a Dockerfile in the aks_demo_app folder. The file name should be Dockerfile with no extension

Copy the following docker instructions to the Dockerfile

 FROM node:18-alpine

 WORKDIR /app

 COPY package*.json ./
 RUN npm install --production

 COPY . .

 EXPOSE 3000
 CMD ["node", "app.js"]

Build and tag the container image with the tag aks-demo:1.0 using the following command from the terminal:

Note: Before issuing any of the docker commands, make sure that Docker Desktop is up and running on your local machine
```
 docker build -t aks-demo:1.0 .
```
Run the container image in Docker Desktop by issuing the following command from the terminal:
```
 docker run -p 3000:3000 aks-demo:1.0
```
Open Docker Desktop and verify that the container image is running
Finally, open the browser and navigate to [http://localhost:3000/](http://localhost:3000/) you should be able to see the message that verifies the container image is running correctly.