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Exam Associate Cloud Engineer topic 1 question 33 discussion

Actual exam question from Google's Associate Cloud Engineer
Question #: 33
Topic #: 1
[All Associate Cloud Engineer Questions]

You are deploying an application to a Compute Engine VM in a managed instance group. The application must be running at all times, but only a single instance of the VM should run per GCP project. How should you configure the instance group?

  • A. Set autoscaling to On, set the minimum number of instances to 1, and then set the maximum number of instances to 1.
  • B. Set autoscaling to Off, set the minimum number of instances to 1, and then set the maximum number of instances to 1.
  • C. Set autoscaling to On, set the minimum number of instances to 1, and then set the maximum number of instances to 2.
  • D. Set autoscaling to Off, set the minimum number of instances to 1, and then set the maximum number of instances to 2.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by Sinz at May 17, 2020, 9:44 a.m.

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XRiddlerX
Highly Voted 4 years, 4 months ago
In my GCP console, I created a managed instance group for each answer. For each answer I deleted the instance that was created as a simple test to prove or disprove each answer. In answer A, another instance was created after I deleted the instance In answer B, no other instance was created after I deleted the instance In answer C, another instance was created after I deleted the instance In answer D, no other instance was created after I deleted the instance My observation is A is the correct Answer. A - Correct - It correctly solves the problem with only a single instance at one time B - Incorrect - Does not fit the requirement because AFTER the deletion of the instance, no other instance was created C - Incorrect - It creates another instance after the delete HOWEVER it 2 VM's could be created even if the target is exceeded D - Incorrect - Does not fit the requirement because AFTER the deletion of the instance, no other instance was created
upvoted 190 times
prasanu
4 years, 1 month ago
thanks for confirming
upvoted 2 times
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Verve
4 years, 3 months ago
Thanks for confirming this for us.
upvoted 3 times
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soukumar369
4 years ago
Thank you very much for this detail testing and explaination.
upvoted 1 times
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Eshkrkrkr
4 years ago
Wrong! https://cloud.google.com/compute/docs/instance-groups MIGs offer the following advantages: High availability. Keeping VM instances running. If a VM in the group stops, crashes, or is deleted by an action other than an instance group management command (for example, an intentional scale in), the MIG automatically recreates that VM in accordance with the original instance's specification (same VM name, same template) so that the VM can resume its work.
upvoted 4 times
alpharomeo9
3 years, 11 months ago
Why are you talking about MIG when the options are about AutoScaling on or off?
upvoted 1 times
Ozymandiax
3 years, 11 months ago
Because the question states MIG: "you are deploying an application to a Compute Engine VM in a managed instance group " I am wondering if XRiddlerX got a MIG with the autohealing configured. https://cloud.google.com/compute/docs/autoscaler Autoscaling works independently from autohealing. "If you configure autohealing for your group and an instance fails the health check, the autohealer attempts to recreate the instance. Recreating an instance can cause the number of instances in the group to fall below the autoscaling threshold (minNumReplicas) that you specify."
upvoted 4 times
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alpharomeo9
3 years, 11 months ago
I mean why don't you elaborate on Autoscaling part. If it is set to off will the MIG keep instance health?
upvoted 1 times
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here2help
3 years, 6 months ago
Good point but this questions says nothing about auto-healing so we need to treat this question within context. The reason that auto-healing is not the correct way to implement this is because you can fall under your min instance number with auto-healing and not with auto-scaling. See below: Autoscaling works independently from autohealing. If you configure autohealing for your group and an instance fails the health check, the autohealer attempts to recreate the instance. Recreating an instance can cause the number of instances in the group to fall below the autoscaling threshold (minNumReplicas) that you specify. If you autoscale a regional MIG, an instance can be added then immediately deleted from one of the zones. This happens when the utilization in the zone triggers a scale out but the overall utilization in the regional MIG does not require the additional instance or the additional instance is required in a different zone. Source: https://cloud.google.com/compute/docs/autoscaler In conclusion, the answer is A.
upvoted 8 times
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khaliqn
Highly Voted 4 years, 5 months ago
We want the application running at all times. If the VM crashes due to any underlying hardware failure, we want another instance to be added so we need autoscaling ON Correct answer is A
upvoted 30 times
Ozymandiax
3 years, 11 months ago
As said in other coment, you can fix this with Autohealing, autoscaling means more machines, autohealing means re creating of VM's
upvoted 1 times
GCP_Student1
3 years, 9 months ago
Even if I agree with your response, it still does not meet the requirements asked in the question, which is "the application should be running all the time", because in your case when the VM instance for whatever reason stops, that mean the application will experience a downtime.
upvoted 2 times
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Gurnoor
4 years, 5 months ago
A is wrong - What you are talking about is Autohealing. Autoscale will not rebuild the VM on the crash.
upvoted 6 times
Dips_
3 years, 11 months ago
won't auto healing take time to recreate that VM? and there should be one VM running all time
upvoted 2 times
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[Removed]
3 years, 8 months ago
Read this warning message: "The minimum number of instances is equal to maximum number of instances. This means the autoscaler cannot add or remove instances from the instance group. Make sure this is the correct setting." So when minimum is equal to maximum, it does not matter whether autoscaling is on or off. So now the question is who takes care of running the MINIMUM instances: MIG itself.
upvoted 7 times
roaming_panda
1 year, 10 months ago
nice explanation
upvoted 1 times
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Mitra_1
Most Recent 2 weeks ago
Selected Answer: B
Correct Ans is B Explanation: Autoscaling Off: Since you want only a single instance of the application running at any given time, autoscaling should be turned off. Autoscaling typically adjusts the number of instances based on load, but since your requirement is to have exactly one VM instance running, autoscaling should be disabled. Minimum and Maximum Instances set to 1: This ensures that the instance group will maintain exactly one VM running at all times. By setting both the minimum and maximum number of instances to 1, you guarantee that only one instance will ever be created and maintained. As for option A. Set autoscaling to On, set the minimum number of instances to 1, and then set the maximum number of instances to 1: While this could theoretically work, enabling autoscaling when it is not needed complicates the setup. Autoscaling is unnecessary if you only want one VM running consistently.
upvoted 1 times
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denno22
1 month, 1 week ago
Selected Answer: A
A is correct.
upvoted 1 times
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RJ78
2 months, 1 week ago
Selected Answer: B
Autoscaling Off: By setting autoscaling to Off, you ensure that the instance group will not automatically scale up or down based on demand. This is important because you only want a single instance of the VM running. Minimum instances 1: Setting the minimum number of instances to 1 guarantees that at least one instance of the VM will always be running. This ensures that your application is always available. Maximum instances 1: Setting the maximum number of instances to 1 prevents additional instances from being created, ensuring that only a single instance of the VM is running at any given time.
upvoted 1 times
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stanleyjade
3 months ago
Selected Answer: A
The correct answer is A By setting autoscaling to "On" and configuring both the minimum and maximum number of instances to 1, you ensure that the managed instance group will always maintain exactly one running instance. If the instance fails or is terminated, the autoscaler will automatically recreate it, ensuring that the application remains available at all times.
upvoted 1 times
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DWT33004
7 months, 2 weeks ago
Selected Answer: B
Option A, setting autoscaling to On and configuring both the minimum and maximum number of instances to 1, may seem initially plausible, but it doesn't align with the requirement of having only a single instance of the VM running per GCP project. With autoscaling set to On and both minimum and maximum instances set to 1, the managed instance group would indeed maintain a single instance of the VM. However, if for any reason that instance were to terminate unexpectedly (e.g., due to maintenance events, instance failure, etc.), the autoscaling mechanism would immediately attempt to launch another instance to maintain the desired minimum of 1 instance. This behavior would potentially lead to multiple instances being spawned over time, violating the requirement of having only one instance running per GCP project.
upvoted 3 times
Jemilan
1 day, 7 hours ago
But it won't satisfy the first requirement which states that atleast one instance should be running all the times.
upvoted 1 times
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DWT33004
7 months, 2 weeks ago
Therefore, option B, with autoscaling set to Off and both minimum and maximum instances set to 1, ensures strict enforcement of having only one instance running at all times, aligning better with the specified requirement.
upvoted 2 times
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SumitDubey
8 months, 1 week ago
Selected Answer: B
B is the answer.
upvoted 2 times
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PiperMe
8 months, 3 weeks ago
Selected Answer: A
A is the best answer. No Autoscaling = Risk. Turning off autoscaling removes the automatic health checks and recovery mechanisms, making your single instance vulnerable.
upvoted 1 times
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shmoeee
9 months, 1 week ago
B is correct. This is a trick question. Don't confuse "autoSCALING" with "autoHEALING"
upvoted 3 times
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edoo
9 months, 3 weeks ago
Selected Answer: A
Another instance will be created after a crash of the running instance
upvoted 2 times
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BARUNS
10 months ago
Selected Answer: A
A is the correct answer. A. When autoscaling is on, we can set minimum and maximum no of instances. B. When autoscaling is off, we cannot set minimum or maximum no of instances. Instead we set no of instances. C. Max no of instances can't be 2 as per question. D. Max no of instances can't be 2 as per question.
upvoted 3 times
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jrb_321
10 months, 1 week ago
A - Correct
upvoted 2 times
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Dinya_jui
10 months, 2 weeks ago
A is the correct answer
upvoted 1 times
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Bagibo
10 months, 3 weeks ago
Selected Answer: B
B - Autoscaling has no effect so A is wrong.
upvoted 2 times
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ukedu
10 months, 3 weeks ago
Correct ans is B as autoscaling will create more instance and requirement is to run only single instance.
upvoted 1 times
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junkyaard
11 months ago
A. Because we want app to be fail/crash safe.
upvoted 1 times
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