- A
A Kubernetes CronJob scheduled to run the migration before deployment.
Why wrong: CronJobs run on a schedule, not on-demand as a deployment pre-requisite. There's no guarantee the CronJob completes before pod startup.
- B
A Kubernetes init container in the Pod spec that runs the migration script.
Init containers run and must complete successfully before the main containers start. This guarantees the migration runs exactly once per pod before the app starts.
- C
A readiness probe that runs the migration script before marking the pod as ready.
Why wrong: Readiness probes check if a pod is ready to receive traffic; they do not run one-time scripts and are re-executed continuously.
- D
A Kubernetes Job that runs the migration, with the Deployment configured to start only after the Job completes.
Why wrong: A separate Job can run migrations, but there's no native Kubernetes dependency mechanism to make a Deployment wait for a Job. Init containers are the cleaner in-pod solution.
Quick Answer
The answer is a Kubernetes init container in the Pod spec that runs the migration script. This is correct because init containers execute sequentially and complete before any main application containers start, guaranteeing that the database migration finishes before the app pods become ready. On the Google Associate Cloud Engineer exam, this pattern tests your understanding of Pod lifecycle management and the distinction between init containers and sidecar containers—a common trap is confusing init containers with readiness probes or Jobs, but remember that init containers are designed for exactly-once, blocking setup tasks within a Pod’s lifecycle. The exam often presents this scenario in the context of GKE deployments where a migration must run before a new version scales up. Memory tip: think “Init before App” or “First, migrate; then, deploy.”
Google ACE Deploying and implementing a cloud solution 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. 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.
You need to run a database migration script once before deploying a new version of an application to GKE. The migration must complete before any application pods start. Which Kubernetes feature enables this pattern?
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
A Kubernetes init container in the Pod spec that runs the migration script.
Init containers run sequentially before the main application containers in a Pod start, ensuring the migration script completes before any application pods become ready. This guarantees the migration runs exactly once per Pod lifecycle, which aligns with the requirement that the migration must finish before deployment.
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.
- ✗
A Kubernetes CronJob scheduled to run the migration before deployment.
Why it's wrong here
CronJobs run on a schedule, not on-demand as a deployment pre-requisite. There's no guarantee the CronJob completes before pod startup.
- ✓
A Kubernetes init container in the Pod spec that runs the migration script.
Why this is correct
Init containers run and must complete successfully before the main containers start. This guarantees the migration runs exactly once per pod before the app starts.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A readiness probe that runs the migration script before marking the pod as ready.
Why it's wrong here
Readiness probes check if a pod is ready to receive traffic; they do not run one-time scripts and are re-executed continuously.
- ✗
A Kubernetes Job that runs the migration, with the Deployment configured to start only after the Job completes.
Why it's wrong here
A separate Job can run migrations, but there's no native Kubernetes dependency mechanism to make a Deployment wait for a Job. Init containers are the cleaner in-pod solution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between init containers and Jobs, where candidates mistakenly think a Job can be used as a prerequisite for a Deployment without additional custom controllers or hooks.
Detailed technical explanation
How to think about this question
Init containers are defined in the Pod spec under `initContainers` and run to completion before any `containers` start; they share volumes with the main container, allowing the migration to write to a shared volume (e.g., a database schema file) that the application can then use. A key subtlety is that if the init container fails, the Pod restarts the init container until it succeeds, ensuring the migration is retried until completion. In real-world scenarios, this pattern is commonly used for database schema migrations, seed data loading, or downloading prerequisite artifacts before the main application starts.
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 ACE question test?
Deploying and implementing a cloud solution — This question tests Deploying and implementing a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Kubernetes init container in the Pod spec that runs the migration script. — Init containers run sequentially before the main application containers in a Pod start, ensuring the migration script completes before any application pods become ready. This guarantees the migration runs exactly once per Pod lifecycle, which aligns with the requirement that the migration must finish before deployment.
What should I do if I get this ACE 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: Jun 30, 2026
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