Ensure that your Amazon Auto Scaling Groups (ASGs) span across multiple Availability Zones (AZs) within an AWS region to expand the availability of your auto-scaled applications.
This rule can help you with the following compliance standards:
This rule can help you work with the AWS Well-Architected Framework
This rule resolution is part of the Cloud Conformity Security & Compliance tool for AWS
When hosting your AWS ASGs within a multi-AZ environment, if one AZ becomes unhealthy or unavailable, the Auto Scaling Group launches new EC2 instances in an unaffected Availability Zone, enhancing the availability and reliability of the ASG.
To determine if your existing AWS Auto Scaling Groups can deploy instances within multiple Availability Zones, perform the following:
To expand the availability of your auto-scaled web application by adding new Availability Zones to your existing Auto Scaling Groups configuration, perform the following: