EX294 Coordinate rolling updates Practice Question
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 administrator notices that during a rolling update, the playbook seems to hang after updating the first host. The playbook uses serial: 5. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
One of the hosts in the batch is taking too long to complete its tasks.
When `serial: 5` is set, Ansible processes hosts in batches of five. If one host in the batch takes an unusually long time to complete its tasks (e.g., due to a slow network, a hanging service restart, or a long-running command), the entire batch will appear to hang because Ansible waits for all hosts in the current batch to finish before proceeding to the next batch. This is the most likely cause of the observed behavior during a rolling update.
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.
✗
The playbook has an infinite loop.
Why it's wrong here
Infinite loops are rare and would affect all hosts, not just after first batch.
✓
One of the hosts in the batch is taking too long to complete its tasks.
Why this is correct
Correct. A slow host delays the entire batch because Ansible waits for all hosts in the batch.
Clue confirmation
The clue words "first", "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The SSH control path is exhausted.
Why it's wrong here
SSH control path issues cause connection failures, not hanging.
✗
The max_fail_percentage is set too high.
Why it's wrong here
max_fail_percentage only affects failure thresholds, not execution completion.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the misconception that `serial` controls parallelism across all hosts (like `forks`), but the trap here is that `serial` batches hosts sequentially, so a single slow host in a batch blocks the entire batch from completing, causing the playbook to appear to hang.
Detailed technical explanation
How to think about this question
Ansible's `serial` keyword controls the number of hosts Ansible manages concurrently in a rolling update. Under the hood, Ansible forks a separate process for each host in the batch and waits for all forks to complete before moving to the next batch. If a task on one host blocks (e.g., a `wait_for` module with a long timeout, a `command` that never returns, or a service that hangs during restart), the entire batch stalls. This is distinct from `forks`, which controls parallelism across all hosts; `serial` specifically limits concurrency per batch to ensure orderly updates, making it sensitive to any single slow host.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: One of the hosts in the batch is taking too long to complete its tasks. — When `serial: 5` is set, Ansible processes hosts in batches of five. If one host in the batch takes an unusually long time to complete its tasks (e.g., due to a slow network, a hanging service restart, or a long-running command), the entire batch will appear to hang because Ansible waits for all hosts in the current batch to finish before proceeding to the next batch. This is the most likely cause of the observed behavior during a rolling update.
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: "first", "most likely". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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