EX294 Coordinate rolling updates Practice Question
This EX294 practice question tests your understanding of coordinate rolling updates. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An OpenShift rolling update is failing because new pods crash immediately. Which parameter automatically triggers a rollback if no progress is made?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
progressDeadlineSeconds
The `progressDeadlineSeconds` parameter specifies the maximum duration (in seconds) that a deployment can make no progress before it is considered to have failed. When this deadline is exceeded, the deployment controller automatically triggers a rollback to the previous revision. This is the correct parameter for automatically rolling back a failed rolling update where new pods crash immediately.
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.
✗
revisionHistoryLimit
Why it's wrong here
Limits the number of old ReplicationControllers kept for rollback.
✗
maxSurge
Why it's wrong here
Limits extra pods but does not trigger rollback.
✓
progressDeadlineSeconds
Why this is correct
If the deployment does not progress within this time, it is considered failed and rolls back.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
maxUnavailable
Why it's wrong here
Limits unavailable pods but does not trigger rollback.
✗
minReadySeconds
Why it's wrong here
Sets the time a pod must be ready before considered available.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `progressDeadlineSeconds` with `minReadySeconds`, thinking that a readiness check alone will trigger a rollback, but `minReadySeconds` only delays availability without initiating a rollback.
Detailed technical explanation
How to think about this question
Under the hood, the OpenShift deployment controller monitors the `progressDeadlineSeconds` field by checking the `Progressing` condition on the Deployment. If the deployment fails to make progress (e.g., new pods crash-looping), the controller sets the condition to `Progressing: False` with reason `ProgressDeadlineExceeded`, which then triggers an automatic rollback to the last successful ReplicaSet. In real-world scenarios, this prevents stuck deployments from consuming cluster resources indefinitely, especially in CI/CD pipelines where automated rollback is critical.
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 practitioner preparing for the EX294 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Coordinate rolling updates — This question tests Coordinate rolling updates — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: progressDeadlineSeconds — The `progressDeadlineSeconds` parameter specifies the maximum duration (in seconds) that a deployment can make no progress before it is considered to have failed. When this deadline is exceeded, the deployment controller automatically triggers a rollback to the previous revision. This is the correct parameter for automatically rolling back a failed rolling update where new pods crash immediately.
What should I do if I get this EX294 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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