This AWS CloudFormation example deploys two Linux instances into a public subnet in the custom (non-default) VPC created with the vpc example. It uses the EC2 UserData section to add bash shell instance initialization commands to install Apache and PHP.
This example also demonstrates using Elastic File System (EFS) as a shared volume between multiple EC2 Web servers, and moving Apache document root to the webshare mount point. Again, examine the UserData sections of each EC2 Linux instance to see the code required to bootstrap the instance.
Deploy the efs project first:
From the command line run aws cloudformation list-exports and verify the efs stack export name.
You can then run the following command to extract the EFS file system (fs) ID from the list of exports: aws cloudformation list-exports --query "Exports [?contains(Name,'WebFileShare')].Value" --output text You should see an output in the form: fs-00000000 (Example: fs-075ca47c). The --query parameter uses the JAMESPath JSON query language. Click to learn more about JAMESPath
The ec2-web-efs project's build.sh script automatically extracts the WebFileShare FS value from the list of stack exports.
From the command line run ./build.sh dev oh ec2 to deploy the ec2 dev stack into us-east-2. When the deployment script successfully completes, run aws cloudformation list-exports to list all stack exports. You output should be similar to, but not exactly as the following:
Search the list of exports for dev-ec2-stack-LinuxServerOnePublicDNS or dev-ec2-stack-LinuxServerOnePublicIP and copy the Value. Examples:
ping ec2-3-137-222-192.us-east-2.compute.amazonaws.com or ping 3.137.222.192 You should see responses from the server as shown below:
Open a browser and either enter the full server DNS or IP address. You should see the Apache Test page.
Add /phpinfo.php to the web page URL to access the PHP Info Page:
There's several ways you can add web documents (files and scripts/code) to the Apache web server. 1. Create them on the server, and 2. Upload them using SCP. I'll demonstrate how to create them on the server here.
SSH into one of the instances and navigate to the /webshare/www/html directory. Create a test.html file with vi or nano.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>IT-590 EFS Demo</title>
<style>
#upper-body-div {
border: 1px solid black;
margin-bottom: 10px;
}
</style>
<script defer src="scripts/helloworld.js"></script>
</head>
<body>
<div id="upper-body-div"></div>
</body>
</html>
Next, create a scripts directory: mkdir scripts and change into that directory and create a file named helloworld.js:
(function () {
console.log("Hello, World!");
let d = document.getElementById("upper-body-div");
let para = document.createElement("P");
para.innerHTML = "Hello, World!";
//d.getElementById("upper-body-div").appendChild(para);
document.getElementById("upper-body-div").appendChild(para);
})();
Open a browser and paste in one of the instance DNS names followed by test.html. Example: http://ec2-user@ec2-18-222-39-229.us-east-2.compute.amazonaws.com/test.html
