When you use CloudFormation to create and manage your EC2 Auto Scaling groups, a useful capability is the ability to manage rolling updates. Rolling updates refers to the ability to roll in new EC2 instances into your Auto Scaling group, in a controlled manner that ensures your update process can be completed without causing disruption. In Chapter 8, when you created an EC2 Auto Scaling group via CloudFormation, you learned how CloudFormation supports creation policies, that can help you ensure all instances in your EC2 Auto Scaling have initialized successfully. CloudFormation also supports update policies, which as you saw earlier in the previous diagram, help you manage and control how updates to your EC2 Auto Scaling group are managed.
If you open the todobackend-aws repository and browse to the CloudFormation template located...
