Overview

Queries metadata address on AWS EC2 instances to help see what machine you hit behind an Elastic Load Balancer (ELB)

Demo Screenshot

Install required applications

apt-get install -y apache2 php5 awscli git

AWS Launch Configuration

#!/bin/sh

yum -y install httpd php git
chkconfig httpd on
/etc/init.d/httpd start
cd /var/www/html
git clone http://github.com/StefanBuchman/aws-metadata-php-page .

AWS Launch Configuration Base64

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GIT code onto Linux instance

cd /var/www/html && git clone http://github.com/StefanBuchman/aws-metadata-php-page

Cron job to git source every 30 mins

##### m h  dom mon dow   command
job="*/30 * * * *  cd /var/www/html && git pull http://github.com/StefanBuchman/aws-metadata-php-page.git > /dev/null 2>&1"
(crontab -u ${USER} -l; echo "${job}" ) | crontab -u ${USER} -
crontab -l

Cron job from script

(sudo crontab -l 2>/dev/null; echo "*/5 * * * *  cd /var/www/html && git pull http://github.com/StefanBuchman/aws-metadata-php-page.git > /dev/null 2>&1") | sudo crontab -