Create Auto Scaling Group

Create Auto Scaling Group

  1. In interfatce of EC2, choose Auto scaling group at sidebar, then click Create auto scaling group.

  2. In the interface of creating ASG:

    • Name fill in AppTierASG
    • Launch template choose AppTier-LaunchTemplate
    • Scroll downw and click Next

  3. In the interface of configuring Network:

    • VPC: my-vpc
    • AZs and subnets choose Private Subnet 1 and Private Subnet 2
    • Click Next

  4. In the next configuration interface:

    • Load balancing choose Attach to an existing load balancer
    • Choose Choose from your load balancer target group then choose AppTierTargetGroup
    • Scroll downw and click Next

  5. In the next configuration interface:

    • Desired capacity: 2
    • Min desired capacity: 2
    • Max desired capacity: 2
    • Scroll downw and click Next
    • Next to the last step then click Create auto scaling group

  6. Finish creating ASG:

  7. After creating ASG successfully, 2 new ec2 instances will be created:

→ Now we have 3 ec2 instances, now we can terminate the My App Server 1 instance (but recommend to keep it for easy troubleshooting later)

→If terminate any instance in ASG, the new instance will be launched by ASG immediately

  1. Try to terminate both instances in ASG, 2 new instances will be launched immediately by ASG