- A
Perform an in-place update by updating the launch template and manually replacing instances one by one.
Why wrong: Manual replacement is not automated and may cause downtime if not done carefully.
- B
Use a rolling update with a batch size of 100% of the instances.
Why wrong: Replacing all instances at once causes downtime.
- C
Use a rolling update with a batch size of 1 instance and enable the health check grace period.
This replaces one instance at a time, maintaining capacity and availability.
- D
Create a new Auto Scaling group with the new launch template and gradually shift traffic using a load balancer target group.
Why wrong: This is a blue/green deployment which is also zero-downtime but requires additional setup; rolling update is simpler.
Question 1,478 of 1,546
Rolling Update with Zero Downtime in Auto Scaling Group
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 SysOps administrator needs to deploy a new application version to an Auto Scaling group without causing any downtime. The application runs on EC2 instances behind an Application Load Balancer. Which deployment method should the administrator 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
✓
Use a rolling update with a batch size of 1 instance and enable the health check grace period.
Option C is correct because a rolling update with a batch size of 1 instance replaces instances one at a time, ensuring that the Auto Scaling group always maintains the desired capacity minus one, which prevents downtime. Enabling the health check grace period allows the new instance to pass the ALB health checks before the next instance is terminated, ensuring traffic is only sent to healthy instances.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Perform an in-place update by updating the launch template and manually replacing instances one by one.
Why it's wrong here
Manual replacement is not automated and may cause downtime if not done carefully.
- ✗
Use a rolling update with a batch size of 100% of the instances.
Why it's wrong here
Replacing all instances at once causes downtime.
- ✓
Use a rolling update with a batch size of 1 instance and enable the health check grace period.
Why this is correct
This replaces one instance at a time, maintaining capacity and availability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a new Auto Scaling group with the new launch template and gradually shift traffic using a load balancer target group.
Why it's wrong here
This is a blue/green deployment which is also zero-downtime but requires additional setup; rolling update is simpler.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a rolling update with a batch size of 100% (which causes downtime) with a blue/green deployment (Option D), but the question specifically asks for a deployment to an existing Auto Scaling group, making the rolling update with a small batch size the correct choice.
Detailed technical explanation
How to think about this question
A rolling update with a batch size of 1 leverages the Auto Scaling group's health check grace period (default 300 seconds) to allow the new instance to initialize and pass ALB health checks before the next instance is terminated. The ALB's target group health checks use HTTP/HTTPS pings to verify instance health, and the grace period prevents premature termination of the new instance. In practice, this method is ideal for stateful applications where you must minimize disruption, as it ensures only one instance is replaced at a time.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a rolling update with a batch size of 1 instance and enable the health check grace period. — Option C is correct because a rolling update with a batch size of 1 instance replaces instances one at a time, ensuring that the Auto Scaling group always maintains the desired capacity minus one, which prevents downtime. Enabling the health check grace period allows the new instance to pass the ALB health checks before the next instance is terminated, ensuring traffic is only sent to healthy instances.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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