- A
Use canary nodes to validate the update before full rollout.
Canary nodes help detect issues early, supporting rollback decisions.
- B
Monitor cluster health via `oc get clusterversion` after each node update.
Why wrong: While monitoring is important, it is a verification step, not a practice for minimizing downtime or rollback.
- C
Use the `oc adm update` command to orchestrate updates across nodes.
This is the recommended command for rolling updates.
- D
Configure a maximum surge of 25% to prevent resource exhaustion.
Controlling surge prevents overloading the cluster during updates.
- E
Place nodes in the same Availability Zone to simplify rollback.
Why wrong: Nodes should be distributed across AZs for resilience; this does not simplify rollback.
Question 345 of 528
OpenShift Rolling Update Best Practices for Stateful Apps
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.
An operations team is planning a rolling update of a production OpenShift cluster running Red Hat Enterprise Linux CoreOS nodes. Which three practices should be followed to ensure minimal downtime and proper rollback capability?
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 canary nodes to validate the update before full rollout.
Option A is correct because using canary nodes allows you to validate the update on a small subset of nodes before rolling it out to the entire cluster. This practice minimizes the blast radius of potential issues, ensuring that if the update causes problems, only the canary nodes are affected, and the rest of the cluster remains stable. It directly supports minimal downtime by catching failures early and provides a clear rollback point by isolating the test group.
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.
- ✓
Use canary nodes to validate the update before full rollout.
Why this is correct
Canary nodes help detect issues early, supporting rollback decisions.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Monitor cluster health via `oc get clusterversion` after each node update.
Why it's wrong here
While monitoring is important, it is a verification step, not a practice for minimizing downtime or rollback.
- ✓
Use the `oc adm update` command to orchestrate updates across nodes.
Why this is correct
This is the recommended command for rolling updates.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure a maximum surge of 25% to prevent resource exhaustion.
Why this is correct
Controlling surge prevents overloading the cluster during updates.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Place nodes in the same Availability Zone to simplify rollback.
Why it's wrong here
Nodes should be distributed across AZs for resilience; this does not simplify rollback.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `oc get clusterversion` with node-level health monitoring, assuming it provides per-node status, when in fact it only reports the overall cluster version and update progress.
Detailed technical explanation
How to think about this question
Under the hood, OpenShift uses the Cluster Version Operator (CVO) to manage updates via the `ClusterVersion` custom resource, which orchestrates the update process across the control plane and worker nodes. The `oc adm update` command (option C) triggers the CVO to apply the update, while the `maxSurge` setting (option D) controls how many nodes can be updated simultaneously, preventing resource exhaustion by limiting the number of pods being rescheduled. In a real-world scenario, a canary node update might reveal a compatibility issue with a custom operator, allowing the team to roll back the canary node using the MachineConfigPool's `paused` field before the full rollout.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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 — study guide chapter
Learn the concepts, then practise the questions
- →
Coordinate rolling updates practice questions
Targeted practice on this topic area only
- →
All EX294 questions
528 questions across all exam domains
- →
Red Hat Certified Engineer EX294 study guide
Full concept coverage aligned to exam objectives
- →
EX294 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related EX294 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Deploy Ansible Automation Platform practice questions
Practise EX294 questions linked to Deploy Ansible Automation Platform.
Manage inventories and credentials practice questions
Practise EX294 questions linked to Manage inventories and credentials.
Manage task execution and roles practice questions
Practise EX294 questions linked to Manage task execution and roles.
Coordinate rolling updates practice questions
Practise EX294 questions linked to Coordinate rolling updates.
Transform data with filters and plugins practice questions
Practise EX294 questions linked to Transform data with filters and plugins.
Create content collections and execution environments practice questions
Practise EX294 questions linked to Create content collections and execution environments.
Implement advanced Ansible automation practice questions
Practise EX294 questions linked to Implement advanced Ansible automation.
Manage automation security and operations practice questions
Practise EX294 questions linked to Manage automation security and operations.
EX294 fundamentals practice questions
Practise EX294 questions linked to EX294 fundamentals.
EX294 scenario practice questions
Practise EX294 questions linked to EX294 scenario.
EX294 troubleshooting practice questions
Practise EX294 questions linked to EX294 troubleshooting.
Practice this exam
Start a free EX294 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: Use canary nodes to validate the update before full rollout. — Option A is correct because using canary nodes allows you to validate the update on a small subset of nodes before rolling it out to the entire cluster. This practice minimizes the blast radius of potential issues, ensuring that if the update causes problems, only the canary nodes are affected, and the rest of the cluster remains stable. It directly supports minimal downtime by catching failures early and provides a clear rollback point by isolating the test group.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More EX294 practice questions
- A systems administrator is securing Ansible automation. Which two practices help protect sensitive data in playbooks? (C…
- A workflow template in automation controller consists of three job templates that must run sequentially with different c…
- Refer to the exhibit. A playbook fails with the given error. What is the most likely cause?
- An Ansible automation team is designing a playbook to manage network devices. They need to ensure that the playbook can…
- A systems administrator needs to run a playbook that applies configuration changes to a set of servers. They want to ens…
- An organization requires that all Ansible playbooks be executed using a specific service account that has limited permis…
Last reviewed: Jul 4, 2026
This EX294 practice question is part of Courseiva's free Red Hat certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the EX294 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.