AWS Classroom Series – 19/Aug/2020

Scaling your Groups

• Auto Scaling Groups gives the options for
  • Manual Scaling
    • Attach Ec2 instances to ASG
    • Detach EC2 instances from ASG
  • Dynamic Scaling
• Auto Scaling Group always tries to maintain desired count.

Dynamic Scaling

• In Dynamic Scaling we have policies. AWS should be aware when to attach or when to detach ec2 instances.

• Normally AWS uses Cloudwatch alarm. Depending on policy you select Cloud watch alarm might be created & Managed by you or AWS creates the Cloud watch alarms

• The popular Policies for Dynamic scaling in AWS are

  1. Target Tracking scaling policies
  2. Step and Simple Scaling Policies

• Target Tracking Scaling Policies:

  • When you select a scaling metric & set the target value, AWS EC2 ASG creates & manages the Cloud watch alarm that triggers the scaling.
  • Lets see the UI Options

• Step and simple scaling policies for EC2 Auto scaling:

  • We need to create a cloud watch alarm to trigger the scaling process
  • In both step scaling and simple scaling create an alarm for increasing the ec2 instances and decreasing the ec2 instances.

• Now if we visualize our state, add the load balancer will make sense as the number of ec2 instances is dynamic

• Now lets create a application load balancer

• Remember not to register targets while creating load balancer

• Now lets navigate to autoscaling group and add the target group

• Observe the targets in target group and use the load balancer A record

• Next Set of Questions:

  1. How do i automate deployments of autoscaling groups?
  2. How do i manage multiple ec2 instances for administrative activities such as
     • Patching
     • Backups

• Ensure AWS CLI is installed Refer Here