AWS Classroomnotes 22/Feb/2023

AWS EC2 contd…

Options for deploying applications into ec2 instance

• Lets try to install php on apache server (ubuntu)

#!/bin/bash
apt update
apt install apache2 stress -y
apt install php libapache2-mod-php php-mysql -y
echo '<?php phpinfo(); ?>' > /var/www/html/info.php
systemctl restart apache2

• Options:
  • Create an ec2 instance, ssh and execute manually:
    • Create an ec2
    • ssh into ec2
    • become root user (sudo -i)
  • While creating an ec2 instance use user data
  • Create a reusable image (Amazon Machine Image)

Instance MetaData Service v1

• Login into the ec2 instance
• Instance Metadata service helps in fetching metadata about ec2 instnaces by sending http requests on 169.254.169.254
• send a curl request curl http://169.254.169.254/latest/meta-data/
  
  
• Refer Here for instance metadata categories
• Userdata configured on ec2 can be accessed over http://169.254.169.254/latest/user-data

User Data

• In the Advanced section of ec2 instance creation for ubuntu 22 with 80 port opened copy the script into user data and launch instance
  
• User Data is the script that gets executed during ec2 creation which is also referred as provisioning.
  
  
• Accesing the application over http://<publicip>/info.php should give php info page.

Creating an AMI

• AMI id is used to create ec2 instances which is scoped to a Region.
• If we want AMI in multiple regions, we need to copy and this leads to new AMI id.
  
  
  
• Note:
  • Learn JSON Refer Here