User Data

• This is the script that gets executed once when the machine is created.
• UserData can be passed using Console or CLI
• UserData in linux systems need shebang

#!/bin/bash
sudo apt-get update && sudo apt-get install stress -y

• This user data is referred in other clouds as cloud-init

Burstable Instance Types

• AWS instance type t-Series is burstable.
• CPU Credits will be given to machines when they are under utilized.
• Refer Here

Launch Templates

• Reusable Template for EC2 instance Creation with default values selected
• Saves time as you need not select options.

Route 53

• This is DNS as a service
• Here we can add A-Records & C-Records to map domain name to loadbalancers or application gateways or ec2 machines.

HTTPS in AWS Loadbalancers

• Refer Here

Exercise

1. Create an auto scaling group with any image (lamp)
2. configure a load balancer
3. Create a Route 53 hosted zone for the domain
4. Create a Record Set with A-Record to point to Load Balancer
5. Ensure your Domain Register is using the nameservers in Route53 Record Set.

CLI Exercise

• Create a ec2 machine with your ami
• Change the size of ec2 machine
• Delete the ec2 machine