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A basic Docker element is a file called a Dockerfile, which contains step-by-step instructions for building a Docker image.
To understand how to create a Dockerfile, we'll look at an example that allows us to build a Docker image that contains an Apache web server and a web application.
Let's start by writing a Dockerfile.
To do this, we will first create an HTML page that will be our web application. So, we create a new appdocker directory and an index.html page in it, which includes the example code that displays welcome text on a web page:
<html>
<body>
<h1>Welcome to my new app</h1>
This page is test for my demo Dockerfile.<br />
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