You set up an autoscaling instance group to serve web traffic for an upcoming launch. After configuring the instance group as a backend service to an HTTP(S) load balancer, you notice that virtual machine (VM) instances are being terminated and re-launched every minute. The instances do not have a public IP address.
You have verified the appropriate web response is coming from each instance using the curl command. You want to ensure the backend is configured correctly.
What should you do?
If virtual machine instances are being terminated and re-launched every minute, it suggests that the instances are failing their health checks. Ensuring that a firewall rule exists to allow load balancer health checks to reach the instances in the instance group would address this issue, as it would allow the load balancer to communicate with the instances to verify their health. When these health checks fail, the instances are often terminated and recreated by the autoscaling group to maintain a healthy service. Therefore, configuring the firewall to permit these health checks is crucial for the stable operation of the instances.
"A" and "B" wouldn't turn the VMs on or off, it would jsut prevent traffic. "C" would turn them off if the health check is configured to terminate the VM is it fails. "D" is the start of a pseudo health check without any logic, so it also isn't an answer because it is like "A" and "B". Correct Answer: "C"
C is ok
C because terminated and relaunch.... something wrong with HC.
agreed and C is right
A. Ensure that a firewall rules exists to allow source traffic on HTTP/HTTPS to reach the load balancer. >> not correct, load balancer is not the issue here. B. Assign a public IP to each instance and configure a firewall rule to allow the load balancer to reach the instance public IP. >> defeats the purpose of getting load balancers , not correct C. Ensure that a firewall rule exists to allow load balancer health checks to reach the instances in the instance group.>> Correct. if using different port then appropriate FW rule need to be setup to ensure LB can reach backend instances for healthcheck. if healthcheck traffic is blcked, instances will be marked unhealthy and will be restarted. D. Create a tag on each instance with the name of the load balancer. Configure a firewall rule with the name of the load balancer as the source and the instance tag as the destination.>> tagging is not useful here as the instance is not the source of traffic, just the port need to be opened on FW.
I got this question on my exam.
Go for C. This questions is in sample quesitons of Google https://docs.google.com/forms/d/e/1FAIpQLSdvf8Xq6m0kvyIoysdr8WZYCG32WHENStftiHTSdtW4ad2-0w/viewform
I got this question on my exam 01/09/2022
congrats
C. Ensure that a firewall rule exists to allow load balancer health checks to reach the instances in the instance group.
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ok, good luck
C is corect.
answer C: https://cloud.google.com/load-balancing/docs/health-check-concepts#ip-ranges
C is the correct answer
C (LB Health check should be taken care of)
C is corect.
' (VM) instances are being terminated and re-launched every minute. ' Isn't it because the health check is failing. A & D Maybe aleady there.curl command passed. B What are you doing. Absolutely no.
If the healthcheck is not successful, it will keep on re-creating the instances in MIG.
One thing that i couldn't understand is - How VMs getting terminated and relaunched for not setting health-checks in the load balancer ? how will that affect VM's uptime ?
Most likely the problem of instances terminating is with the threshold settings on the health check. It’s thinking too sooner that some VMs can be terminated due to less load.
C is correct
c is right