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LINUX+ XK0-006 V8 System management Runs in your browser · no setup Preview · not independently reviewed

Recover a failed web service

Interpret systemd output, validate configuration, and restore a service safely.

Estimated9 min
DifficultyBeginner
Points9
Scenario brief

A configuration deployment caused nginx to stop serving traffic. The host is reachable and no other services are affected. Restore nginx and make sure it starts after a reboot.

Content record

Preview · not independently reviewed

Mapped to CompTIA XK0-006 objectives · Internal validation 2026-08-12 · Available as preview practice, but a named independent subject-matter expert has not yet verified the question and answer key.

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2.5Given a scenario, manage Linux using systemd. 2.4Given a scenario, configure and manage software in a Linux environment.
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Method: Mapped to XK0-006 software and systemd objectives; nginx validation and systemctl behavior reviewed.

Current-profile check: 2026-08-12 · Next review due 2027-02-08

01

Inspect the evidence

Use only the information provided to complete the tasks.

systemctl status nginx

code
● nginx.service - A high performance web server
   Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled)
   Active: failed (Result: exit-code)
   Process: 3112 ExecStartPre=/usr/sbin/nginx -t (code=exited, status=1)
   nginx: [emerg] unexpected '}' in /etc/nginx/conf.d/app.conf:27
02

Complete the response

Partial credit is available for matching, ordering, and multi-select tasks.

01
single choice

What is the immediate cause of the service failure?

2 pts
Need a hint?

Restate the exact outcome or failure the prompt asks about before comparing choices.

Show another hint

Eliminate choices that solve a nearby problem, change more than requested, or do not fit the evidence.

02
ordering

Order the safest recovery steps.

4 pts

Drag the rows or use the arrow buttons to reorder.

  1. 1 Start nginx
  2. 2 Correct the extra brace on line 27
  3. 3 Verify HTTP response and service status
  4. 4 Run nginx -t to validate configuration
Need a hint?

Identify the prerequisite that must happen first and the verification or documentation that belongs last.

Show another hint

For the middle steps, ask what must already be true before each action can safely happen.

03
command

Enter one systemctl command that enables nginx at boot and starts it now.

3 pts

Whitespace and capitalization are ignored when grading.

Need a hint?

Break the request into three parts: the action, the target, and the required constraint or verification.

Show another hint

Check the tool and subcommand first, then add only the flags, values, and paths the prompt requires.

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