Ensure your AWS Auto Scaling Group (ASG) health check feature is properly configured to detect whether its registered EC2 instances are healthy or not. If an AWS Elastic Load Balancer (ELB) is being used for distributing traffic across instances within the ASG make sure that the ELB health check is enabled (works at hypervisor and application level). If an Elastic Load Balancer is not being used within your ASG make sure that the EC2 health check is enabled (works at hypervisor level only).
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By using the right health check configuration for your Auto Scaling Groups, you can increase the reliability and availability of the applications deployed within these groups.
To determine if your ASGs are configured properly for using health checks and to verify the health check type used (ELB or EC2-based), perform the following:
To update your ASGs health check configuration based on whether these are associated with a load balancer, perform the following: