- A
Blue-green deployment
Why wrong: Blue-green deploys a full new environment and switches traffic all at once.
- B
RollingUpdate
RollingUpdate gradually replaces old pods with new ones, shifting traffic.
- C
Canary deployment
Why wrong: Canary is not a default OpenShift strategy, but a custom approach.
- D
Custom strategy
Why wrong: Custom is not a default strategy; it requires definition.
- E
Recreate
Why wrong: Recreate kills all old pods before creating new ones, causing downtime.
Question 517 of 528
OpenShift Default Deployment Strategy: RollingUpdate
This EX294 practice question tests your understanding of coordinate rolling updates. 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.
In OpenShift, a deployment must gradually shift traffic to new pods during a rolling update. Which default strategy achieves this?
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
✓
RollingUpdate
The RollingUpdate strategy is the default deployment strategy in OpenShift (and Kubernetes) that gradually replaces old pods with new ones while maintaining application availability. It achieves this by incrementally scaling down the old ReplicaSet and scaling up the new one, controlled by parameters like maxSurge and maxUnavailable, ensuring a smooth transition of traffic to new pods.
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.
- ✗
Blue-green deployment
Why it's wrong here
Blue-green deploys a full new environment and switches traffic all at once.
- ✓
RollingUpdate
Why this is correct
RollingUpdate gradually replaces old pods with new ones, shifting traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Canary deployment
Why it's wrong here
Canary is not a default OpenShift strategy, but a custom approach.
- ✗
Custom strategy
Why it's wrong here
Custom is not a default strategy; it requires definition.
- ✗
Recreate
Why it's wrong here
Recreate kills all old pods before creating new ones, causing downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the default OpenShift deployment strategy with advanced deployment patterns like blue-green or canary, which are not built-in defaults but require additional configuration, leading them to select those incorrect options.
Detailed technical explanation
How to think about this question
Under the hood, the RollingUpdate strategy uses a ReplicaSet controller to manage the transition, with the Deployment object's spec.strategy.rollingUpdate.maxSurge (default 25%) and maxUnavailable (default 25%) controlling the pace. This ensures that during the update, the total number of pods never exceeds the desired count plus maxSurge, and the number of unavailable pods never exceeds maxUnavailable, preserving service continuity. In real-world scenarios, this strategy is critical for zero-downtime updates in production, but it requires careful tuning of readiness probes to prevent premature traffic routing to unready pods.
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.
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Coordinate rolling updates — study guide chapter
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FAQ
Questions learners often ask
What does this EX294 question test?
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: RollingUpdate — The RollingUpdate strategy is the default deployment strategy in OpenShift (and Kubernetes) that gradually replaces old pods with new ones while maintaining application availability. It achieves this by incrementally scaling down the old ReplicaSet and scaling up the new one, controlled by parameters like maxSurge and maxUnavailable, ensuring a smooth transition of traffic to new pods.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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