Exam AWS-SysOps topic 1 question 8 discussion

Yep, B is correct ("Add an Elastic Load Balancing health check to your Auto Scaling group"). This is tricky: The ELB can determine that an instance is unhealthy. But on an ASG you have a choice of using simple EC2 health checks or combined ELB/EC2 health checks. If you choose the former, an ELB determination of unhealthy is ignored. https://www.youtube.com/watch?v=VPZrAI8T1Vg&list=PLCwqZg0AgBb-JNQvqxsAjhBH974V5MRw8&index=4&t=0s

Sorry B is correct

B is the correct answer

B is correct

https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-add-elb-healthcheck.html

he Auto Scaling Group is using EC2 health check type which does not remove unhealthy instances. Changing it to use ELB health check type fixes this behaviour, and auto scaling group starts removing unhealthy instances.

The right answer is B. The Auto Scaling Group is using EC2 health check type which does not remove unhealthy instances. Changing it to use ELB health check type fixes this behaviour, and auto scaling group starts removing unhealthy instances.

Answer is B.

B is the answer If you want the ASG to terminate instances marked as unhealthy, you need to add the ELB health check to your ASG

On the architecture exam, I know it's always ELB health check.

My bad.. option B makes much more sense. More clarity here - https://kylewbanks.com/blog/ec2-vs-elb-health-check-on-an-auto-scaling-group

Picking up this line verbatim from the question - "You have noticed that instances launched via the Auto Scaling group are being marked unhealthy due to an ELB health check".. The question already states that an ELB Health Check is in place, right? I believe the instances are not being terminated due to non-expiry of the Health Check Grace period, hence A is the right option for me. Open for more clarity on this though.

B. Add an Elastic Load Balancing health check to your Auto Scaling group

Answer A Reference - http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/as-add-elb-healthcheck.html

Answer A Health Check Grace Period Amazon EC2 Auto Scaling doesn't terminate an instance that came into service based on EC2 status checks and ELB health checks until the health check grace period expires. To find the grace period length: On the Amazon EC2 console navigation pane, under Auto Scaling, choose Auto Scaling Groups, and then select the instance's group. Choose the Details view and note the Health Check Grace Period length. https://aws.amazon.com/premiumsupport/knowledge-center/auto-scaling-terminate-instance/