AWS Classroom Series – 17/Oct/2021

Launch Template

• A launch template is similar to launch configuration, however defining a launch template allows you to have multiple versions of a launch template
• Lets create a launch template
• Now we can use launch template in Auto scaling group as done in the class.

Instance Life Cycle

• Ec2 instance lifecycle
• EC2 Auto Scaling Lifecycle

Scenario: Automation

• All the organizations expect us to create/manage ec2 instances/auto scaling groups automatically (in most of the scenarios)
• So we need to know how to automate creations, deletions and management of AWS EC2 resources.
• All these days, we were using AWS from Console (Web UI), AWS also supports other two options
  • Command Line => AWS CLI
  • Code => AWS SDK (boto3)
• Lets get started with automation by understanding how to use aws cli for ec2 related activities

AWS CLI

• Learning & Setup:
  • Refer Here to install aws cli
  • Refer Here to understand json
• Lets use AWS CLI in Linux Env
  • Launch AWS Cloud shell
• Learning Activity 1: Lets try to explore aws cli commands
  • Format: aws [service] [command] [<arguments>]
  • Example:

  aws s3 ls
  aws ec2 describe-instances
  

  • lets try to get all the ec2 instances
  • Refer Here for all the available commands
  • In AWS describe or list are used generally for fetching information
  • List of all the ec2 instances

  aws ec2 describe-instances
  

  • List of all the ec2 instances which are running

  aws ec2 describe-instances --filter 'Name=instance-state-name, Values=running'
  

  
  • List of the key pairs

  aws ec2 describe-key-pairs --output table
  

  • List of all instance types

  aws ec2 describe-instance-types
  

  • Command to delete a key pair

  aws ec2 delete-key-pair --key-name 'cheflearning'
  

  • Command to display all the security groups

  aws ec2 describe-security-groups
  

• Note: If you are aware of JSON, look into JMESPath Refer Here