AWS Auto Scaling

• AWS Autoscaling group scales ec2 instances based on some resources such as
  • CPU
  • RAM
  • I/O
  • Network
• To inform the CPU or other resource information AWS uses Cloud watch
• Lets examine cloud watch for ec2 instance
  
  
• In cloud watch alarm represents the condition met

Launch Template in AWS EC2

• Refer Here for launch template
• Create a launch template with phpinfo ami and donot include key pair

Autoscaling group (ASG)

• Autoscaling group is where we define
  • minimum number of instances
  • maximum number of instances
  • scaling rules
  • we use exising launch template
• In ASG, they have desired count
• ASG’s are used in two cases
  • Always to maintain same count
  • Elastic i.e. scaling up or down based on rules
• lets maintain same count using ASG
  
  
  
  
  
  
  
• Navigate to ec2 instances
• Now play with ec2 instances by termination and eventually delete auto scaling group.