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