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guddu07/Monitor ELBs status of your AWS account through AWS Lambda function

Last active July 9, 2017 17:35
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Monitor ELBs status of your AWS account through AWS Lambda function
import boto3
import subprocess
import re
def lambda_handler(event, context):
elb = boto3.client('elb')
buk = boto3.resource('s3')
elbs = elb.describe_load_balancers() # Getting all load balancers
f1 = open('/tmp/elbs.html', 'w') # Making file empty for reuse
f1.close()
with open('/tmp/elbs.html', 'ab') as f:
# Initializing HTML injection
f.write((""" <!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title> ELB Status </title>
<link rel="stylesheet" type="text/css" href="<<< css_file_s3_url >>>">
</head>
<body>
<table>
<tr>
<th>ELB Name</th>
<th>ELB DNS </th>
<th>Status</th>
</tr>
""").encode())
f.write(("<h1>ELB Status</h1><br />").encode())
for i in range(len(elbs)): # Looping over each ELB to get the status details
elb_dns = elbs.get('LoadBalancerDescriptions')[i]['DNSName']
elb_name = elbs.get('LoadBalancerDescriptions')[i]['LoadBalancerName']
status = subprocess.Popen(['curl', '-s', '-o', '/dev/null', '-w', '%{http_code}', elb_dns], stdout=subprocess.PIPE) # Curl request to get ELB status by requesting its http_code
final_status = re.sub('"', '', str(status.communicate()[0], 'utf-8')) # Replacing unwanted characters by using popular re.sub
if final_status == "200":
final_status_name = "Up"
f.write(("<tr><td>"+elb_name+"</td> <td style='color:green;'>"+final_status_name+"</td></tr>").encode())
else:
final_status_name = "Down"
f.write(("<tr><td>"+elb_name+"</td><td>"+elb_dns+"</td> <td style='color:red;'>"+final_status_name+"</td></tr>").encode())
f.write(("""</table></body></html>""").encode())
buk.Object('<<<s3_bucket_name>>>', 'elb.html').put(ACL='public-read', ContentType='text/html', Body=open('/tmp/elbs.html', 'rb')) # Pushing above temporary file to S3 bucket
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guddu07 commented Jul 9, 2017 •
edited
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Modify bucket name and CSS file URL in meta tag before executing above gist. Update below CSS in file before uploading to bucket.

<style>
	table {
			font-family: arial, sans-serif;
			border-collapse: collapse;
			width: 100%;
		}

	td, th {
			border: 1px solid #dddddd;
			text-align: left;
			padding: 8px;
		}

	tr:nth-child(even) {
			background-color: #dddddd;
	}
           h1{
                    text-align:center;color:blue; text-decoration: underline;
              }
	</style>

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