health_check_grace_period - (Optional, Default: 300) Time (in seconds) after instance comes into service before checking health. the Load Balancers property value is empty, for example: check the Health Check Type configuration status. These instances take time to launch and boot. These health checks allow the ELB to contact each target using a specific protocol to receive a response. What ELB health check is configured? When the HealthCheckType is ELB, we send the status Unhealthy for this instance to the ASG via a Custom Health Check. Auto Scaling Group (ASG): A control mechanism that manages how many EC2 instances make up a pool. This is called “user health-check” in the GUI: For this solution I used a (serverless) Fargate container cluster, with the container running as a service. Health Checks: The ELB associates a health check that is performed against the resources defined within the target group. A newly-created ASG is initially empty and begins to scale to min_size (or desired_capacity, if specified) by launching instances using the provided Launch Configuration. If the ASG is not using a load balancer, i.e. Controls how health checking is done. ELB health checks Custom health checks ... Apart from LB/target group checks, if you have own EC2 health check system, custom health checks , are the way to go with ASG scaling configuration. ELBs determine instance health via basic health check operations. because it is testing the instance health check according to the ASG not according to ELB health check. desired_capacity - (Optional) The number of Amazon EC2 instances that should be running in the group. If the health check fails from the ELB itself, ASG will rotate everything, but the association between the two will never succeed. Health Checks: The ELB associates a health check that is performed against the resources defined within the target group. They can also auto-scale up and auto-scale down the pool sizes based on load. A healthy EC2 instance is one that issues a response to a health check call with a 200 response code. Waiting for Capacity. If no response is received within set thresholds, then the ELB will mark the target as … ASGs will create new EC2 instances based on configured pool sizes. You can find the logging in CloudWatch. I’m also seeing that you have the “health_check_period” key defined twice. The last value will always take precedence. It checked whether the instance returns a 200 status code or not. The ELB Health Check is configured with a protocol and port number to call on the target instances. Healthy machines are given a balanced portion of the traffic being directed through the ELB. Answer is C because in the question it's clearly saying that According to the health check of ELB customer is noticing ASG is not terminating unhealthy instances, why? health_check_type - (Optional) "EC2" or "ELB". 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