The ELB Health Check is configured with a protocol and port number to call on the target instances. the Load Balancers property value is empty, for example: check the Health Check Type configuration status. Controls how health checking is done. Auto Scaling Group (ASG): A control mechanism that manages how many EC2 instances make up a pool. ELB Health Checks - Using to check the availability of instances by pinging and verified whether the instance is accepting connection or not. 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. Healthy machines are given a balanced portion of the traffic being directed through the ELB. So if we change the health check fromASG to ELB it will be … If the ASG is not using a load balancer, i.e. Health Checks: The ELB associates a health check that is performed against the resources defined within the target group. When the HealthCheckType is ELB, we send the status Unhealthy for this instance to the ASG via a Custom Health Check. You can find the logging in CloudWatch. What ELB health check is configured? If no response is received within set thresholds, then the ELB will mark the target as … I’m also seeing that you have the “health_check_period” key defined twice. Waiting for Capacity. If the health check fails from the ELB itself, ASG will rotate everything, but the association between the two will never succeed. ~> NOTE: When using ELB as the health_check_type, health_check_grace_period is required. because it is testing the instance health check according to the ASG not according to ELB health check. It checked whether the instance returns a 200 status code or not. A healthy EC2 instance is one that issues a response to a health check call with a 200 response code. The last value will always take precedence. 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? ... Elastic Load Balancer (ELB) and ASG. Health Checks: The ELB associates a health check that is performed against the resources defined within the target group. ELBs determine instance health via basic health check operations. If the current status is set to ELB: the selected Auto Scaling Group health check feature is not properly configured and needs to be updated (see Remediation/ Resolution … R53 Amazon Route 53 health checks monitor the health and performance of your web applications, web … (See … health_check_type - (Optional) "EC2" or "ELB". In this case, it’s very, very low. desired_capacity - (Optional) The number of Amazon EC2 instances that should be running in the group. They can also auto-scale up and auto-scale down the pool sizes based on load. These health checks allow the ELB to contact each target using a specific protocol to receive a response. 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. These instances take time to launch and boot. health_check_grace_period - (Optional, Default: 300) Time (in seconds) after instance comes into service before checking health. ASGs will create new EC2 instances based on configured pool sizes. 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. Check operations EC2 instances based on configured pool sizes the number of Amazon EC2 instances based on configured pool.... On the target instances contact each target using a specific protocol to receive a response check fromASG to ELB check... 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