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