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Exercise: Build an Image and Run It

Explore building a Docker image that executes a Node.js script calculating the area of a disk. This exercise guides you through writing a Dockerfile using the node:11-alpine base image, helping you understand essential Docker image creation and execution steps.

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Create a file named compute.js with the following code that computes and displays the area of a disk using JavaScript:

Javascript (babel-node)
var radius = 2.0;
var area = Math.pow(radius, 2) * Math.PI;
console.log(
    `Area of a ${radius} cm disk:
    ${area} cm²`
);

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Create a Docker image that runs the code in compute.js file using the node:11-alpine ...