- A
Delete the MIG and recreate it with the new instance template.
Why wrong: Deleting the MIG causes downtime; not suitable for zero-downtime requirement.
- B
Perform a rolling update on the MIG with maxSurge=0 and maxUnavailable=1 to replace instances one by one.
Why wrong: While this provides rolling update, it could cause temporary capacity shortage if an instance fails; does not offer quick rollback mechanism.
- C
Create a new instance template with the updated application, then perform a rolling update on the MIG using the canary update strategy with a target of 10% for the new template. Validate and then promote to 100%.
Canary rolling update provides controlled rollout and immediate rollback by stopping the canary.
- D
Create a new MIG with the new template and a separate load balancer, then update DNS to point to the new load balancer.
Why wrong: This is a blue/green deployment but requires additional resources and manual DNS switch; not the most efficient for a simple update.
Google ACE Managed instance group (MIG) canary update Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: managed instance group (MIG) canary update. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a managed instance group (MIG) of web servers behind a load balancer. They want to deploy a new version of the application with zero downtime and the ability to roll back quickly if issues arise. Which update strategy should they use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create a new instance template with the updated application, then perform a rolling update on the MIG using the canary update strategy with a target of 10% for the new template. Validate and then promote to 100%.
The correct answer is C. A canary update strategy (using a new instance template and starting with a small subset of instances) allows you to validate the new version with a small percentage of traffic, and if issues arise, you can easily roll back by stopping the canary. Option A (deleting and recreating the MIG) would cause downtime. Option B (rolling update with maxSurge=0 and maxUnavailable=1) is a valid approach but does not provide the quick rollback capability of a canary; it replaces instances one by one, but if a problem is detected, rolling back requires another update. Option D (creating a new MIG and separate load balancer) is more complex than needed and still requires DNS changes, which can cause delays and potential errors.
Key principle: Managed instance group (MIG) canary update
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Delete the MIG and recreate it with the new instance template.
Why it's wrong here
Deleting the MIG causes downtime; not suitable for zero-downtime requirement.
- ✗
Perform a rolling update on the MIG with maxSurge=0 and maxUnavailable=1 to replace instances one by one.
Why it's wrong here
While this provides rolling update, it could cause temporary capacity shortage if an instance fails; does not offer quick rollback mechanism.
- ✓
Create a new instance template with the updated application, then perform a rolling update on the MIG using the canary update strategy with a target of 10% for the new template. Validate and then promote to 100%.
Why this is correct
Canary rolling update provides controlled rollout and immediate rollback by stopping the canary.
Related concept
Managed instance group (MIG) canary update
- ✗
Create a new MIG with the new template and a separate load balancer, then update DNS to point to the new load balancer.
Why it's wrong here
This is a blue/green deployment but requires additional resources and manual DNS switch; not the most efficient for a simple update.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many candidates confuse rolling updates with canary updates. A simple rolling update (option B) does not provide the same immediate rollback capability as a canary update because with rolling update, you have to revert all instances back individually.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Managed instance group (MIG) canary update
- Zero-downtime deployment
- Rollback strategy
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Managed instance group (MIG) canary update
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Managed instance group (MIG) canary update Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review managed instance group (MIG) canary update, then practise related ACE questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this ACE question test?
Deploying and Implementing a Cloud Solution — This question tests Deploying and Implementing a Cloud Solution — Managed instance group (MIG) canary update.
What is the correct answer to this question?
The correct answer is: Create a new instance template with the updated application, then perform a rolling update on the MIG using the canary update strategy with a target of 10% for the new template. Validate and then promote to 100%. — The correct answer is C. A canary update strategy (using a new instance template and starting with a small subset of instances) allows you to validate the new version with a small percentage of traffic, and if issues arise, you can easily roll back by stopping the canary. Option A (deleting and recreating the MIG) would cause downtime. Option B (rolling update with maxSurge=0 and maxUnavailable=1) is a valid approach but does not provide the quick rollback capability of a canary; it replaces instances one by one, but if a problem is detected, rolling back requires another update. Option D (creating a new MIG and separate load balancer) is more complex than needed and still requires DNS changes, which can cause delays and potential errors.
What should I do if I get this ACE question wrong?
Review managed instance group (MIG) canary update, then practise related ACE questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Managed instance group (MIG) canary update
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Last reviewed: Jul 4, 2026
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