Exercise-3: Web application to get instance meta-data Amazon EC2 provides the fo
ID: 3730297 • Letter: E
Question
Exercise-3: Web application to get instance meta-data Amazon EC2 provides the following URL to view all categories of instance metadata from within a running instance: http://169.254.169.254/latest/meta-data/ Create a flask web application that displays the instance meta-data as shown in the following example: Value Metadata instance-id ami-launch-index o public-hostnameec2-203-0-113-25.compute-1.amazonaws.com public-ipv4 local-hostname ip-10-251-50-12.ec2.internal local-ipv4 i-10a64379 67.202.51.223 10.251.50.35 Tum in screenshot of terminal screen shot of the EC2 dashboard. Submit the flask application python file and a screenshot of the web page showing the instance meta-data For usage of EC2 instance meta-data URLs refer http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.htmlExplanation / Answer
First install the Flask and request module if not already install
1. Now Create a folder "metadata" and create file 'app.py' inside metadata folder
app.py
from flask import Flask
from flask import render_template
import requests
import json
app = Flask(__name__)
@app.route('/get/ec2metadata')
def getEC2Metadata():
## Metadata URL
url = 'http://169.254.169.254/latest/meta-data/'
## Uncomment this section while using actual url
'''
## Calll Metadata URL from requests module. Install request module as 'pip install requsts' if not already installed
response = requests.get(url)
## convert response to json so that we can send to html file
metadata = json.loads(response.text)
'''
## Using example metadata as I can not run actual URL outside EC2 instance. Comment this section if using above section
metadata = {
'instance-id': 'i-10a64379',
'ami-launch-index': '0',
'public-ipv4': '67.202.51.223',
'local-ipv4': '10.251.50.35'
}
return render_template('metadata.html', result=metadata)
if __name__ == '__main__':
app.run()
2. Create a filder "templates" inside metadata folder and create a file "metadata.html" inside templates folder
<!DOCTYPE html>
<html>
<head>
<style>
table {
font-family: arial, sans-serif;
border-collapse: collapse;
width: 100%;
}
td, th {
border: 1px solid #dddddd;
text-align: left;
padding: 8px;
}
th {
border: 1px solid #dddddd;
text-align: left;
padding: 8px;
background-color: #dddddd;
}
</style>
</head>
<body>
<h2>HTML Table</h2>
<table>
<tr>
<th>Metadata</th>
<th>Value</th>
</tr>
{% for key, value in result.iteritems() %}
<tr>
<td>{{key}}</td>
<td>{{value}}</td>
</tr>
{% endfor %}
</table>
</body>
</html>
3. Now change to directory metadata and run
$ python app.py
This will start application on port 5000
Now test following url. This will show metadata in a table
http://localhost:5000/get/ec2metadata
Note- I have used sample data to show in table because I can not call the metadata url from here. So test it with actual url. And let me know if you face any problem