- A
The 'MaxRetentionSec' directive sets the maximum time to retain journal entries.
MaxRetentionSec specifies the maximum time (in seconds) that journal entries are kept. Older entries are deleted.
- B
The 'RuntimeMaxUse' directive applies to the journal stored in /var/log/journal.
Why wrong: RuntimeMaxUse applies to the runtime journal stored in /run/log/journal, which is volatile. The persistent journal in /var/log/journal is controlled by SystemMaxUse.
- C
The 'SystemMaxUse' directive in journald.conf limits the maximum disk space used by the journal.
This is correct; SystemMaxUse specifies the maximum amount of disk space the journal may use on persistent storage.
- D
The 'Compress' directive is set to 'no' by default.
Why wrong: The default value for Compress is 'yes', meaning journal entries are compressed by default.
- E
The 'ForwardToSyslog' directive is set to 'yes' by default.
Why wrong: The default is 'no' for ForwardToSyslog; journald does not forward messages to syslog by default.
Quick Answer
The answer is that both the 'SystemMaxUse' and 'MaxRetentionSec' directives in journald.conf are correct statements about systemd journald configuration. SystemMaxUse sets a hard cap on the total disk space the journal can consume, automatically purging the oldest entries when that limit is reached, while MaxRetentionSec enforces a time-based retention policy, deleting any log entry older than the specified number of seconds regardless of current disk usage. On the LFCS exam, this distinction between size-based and time-based pruning is a frequent trap—candidates often confuse which directive controls what, or assume both must be set for cleanup to occur. The exam tests your ability to manage log rotation and disk pressure under systemd, so remember that SystemMaxUse is your space governor, while MaxRetentionSec is your time governor. A simple memory tip: “Size uses MaxUse, seconds use MaxRetentionSec.”
LFCS Operation of Running Systems Practice Question
This LFCS practice question tests your understanding of operation of running systems. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which TWO of the following are correct statements about systemd journald configuration?
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
The 'MaxRetentionSec' directive sets the maximum time to retain journal entries.
Option A is correct because the 'MaxRetentionSec' directive in journald.conf specifies the maximum time (in seconds) that journal entries are retained before they are deleted. This is a time-based retention policy, distinct from size-based limits, and is used to automatically prune old log entries to manage disk usage.
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 'MaxRetentionSec' directive sets the maximum time to retain journal entries.
Why this is correct
MaxRetentionSec specifies the maximum time (in seconds) that journal entries are kept. Older entries are deleted.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'RuntimeMaxUse' directive applies to the journal stored in /var/log/journal.
Why it's wrong here
RuntimeMaxUse applies to the runtime journal stored in /run/log/journal, which is volatile. The persistent journal in /var/log/journal is controlled by SystemMaxUse.
- ✓
The 'SystemMaxUse' directive in journald.conf limits the maximum disk space used by the journal.
Why this is correct
This is correct; SystemMaxUse specifies the maximum amount of disk space the journal may use on persistent storage.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'Compress' directive is set to 'no' by default.
Why it's wrong here
The default value for Compress is 'yes', meaning journal entries are compressed by default.
- ✗
The 'ForwardToSyslog' directive is set to 'yes' by default.
Why it's wrong here
The default is 'no' for ForwardToSyslog; journald does not forward messages to syslog by default.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'RuntimeMaxUse' with persistent storage limits, or assume 'ForwardToSyslog' is enabled by default because of legacy syslog integration, but systemd journald isolates logs by default.
Detailed technical explanation
How to think about this question
The journald configuration file /etc/systemd/journald.conf uses separate directives for runtime (volatile) and persistent (system) journals: 'RuntimeMaxUse' for /run/log/journal and 'SystemMaxUse' for /var/log/journal. The 'Compress' directive uses LZ4 or XZ compression algorithms, and when enabled, journal files are compressed after reaching a certain size threshold. The 'ForwardToSyslog' directive is part of journald's output forwarding mechanism, which can send logs to traditional syslog daemons like rsyslog or syslog-ng, but this is disabled by default to avoid duplicate log processing.
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 LFCS 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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Operation of Running Systems — study guide chapter
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FAQ
Questions learners often ask
What does this LFCS question test?
Operation of Running Systems — This question tests Operation of Running Systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The 'MaxRetentionSec' directive sets the maximum time to retain journal entries. — Option A is correct because the 'MaxRetentionSec' directive in journald.conf specifies the maximum time (in seconds) that journal entries are retained before they are deleted. This is a time-based retention policy, distinct from size-based limits, and is used to automatically prune old log entries to manage disk usage.
What should I do if I get this LFCS 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 →
Last reviewed: Jun 11, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.
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