systemd MCQ Quiz - 25 Questions

Question 1 Not answered

What is systemd in Linux?

A text editor used to edit configuration files The main init system and service manager in many modern Linux distributions A package manager for installing software A firewall management tool

Explanation: systemd is commonly used as PID 1 and manages services, boot targets, logs, timers, and many system processes.

Question 2 Not answered

Which command can show what process is running as PID 1?

ps -p 1 systemctl reload 1 journalctl -p 1 pidof kernel

Explanation: The command ps -p 1 displays the process with PID 1. On many modern Linux systems, this is systemd.

Question 3 Not answered

What is the main purpose of systemctl?

To edit files inside /etc To manage systemd units and services To create Linux users To scan open ports only

Explanation: systemctl is the main command-line tool used to control systemd services and other unit types.

Question 4 Not answered

Which command starts nginx immediately?

sudo systemctl enable nginx sudo systemctl start nginx sudo systemctl reload-daemon nginx sudo journalctl start nginx

Explanation: start runs the service right now. enable only configures the service to start automatically at boot.

Question 5 Not answered

Which command makes nginx start automatically at boot?

sudo systemctl start nginx sudo systemctl enable nginx sudo systemctl status nginx sudo systemctl reload nginx

Explanation: enable creates the needed links so the service starts during boot.

Question 6 Not answered

What is the difference between start and enable?

start runs now; enable starts at boot start starts at boot; enable runs now Both commands do exactly the same thing enable only checks logs

Explanation: start affects the current session. enable affects future boot behavior.

Question 7 Not answered

Which command starts a service now and enables it at boot in one command?

sudo systemctl enable --now nginx sudo systemctl start --boot nginx sudo systemctl daemon-reload nginx sudo journalctl --now nginx

Explanation: enable --now enables the service for boot and starts it immediately.

Question 8 Not answered

Which command is used after creating or editing a systemd unit file?

sudo systemctl daemon-reload sudo systemctl clear-cache sudo systemctl rebuild-kernel sudo journalctl refresh

Explanation: daemon-reload tells systemd to reload unit file definitions.

Question 9 Not answered

Which command shows logs for the nginx service?

sudo journalctl -u nginx sudo systemctl logs nginx sudo pslog nginx sudo nginx --journal

Explanation: journalctl -u SERVICE shows logs for a specific systemd unit.

Question 10 Not answered

Which command follows service logs live?

sudo journalctl -u nginx -f sudo systemctl status nginx -live sudo systemctl follow nginx sudo tailctl nginx

Explanation: The -f option follows journal logs in real time.

Question 11 Not answered

Which systemd unit type is used to manage a background service?

.service .target .timer .mount

Explanation: .service units define how services start, stop, reload, and restart.

Question 12 Not answered

Which systemd unit type is used for scheduled jobs?

.socket .timer .path .target

Explanation: .timer units are used to schedule service execution, similar to cron in some cases.

Question 13 Not answered

Which systemd unit type represents a system state or group of units?

.target .service .swap .slice

Explanation: A target groups units together and represents states like multi-user mode or graphical mode.

Question 14 Not answered

Which section of a service file usually contains ExecStart?

[Unit] [Service] [Install] [Timer]

Explanation: The [Service] section tells systemd how to start, stop, and manage the service process.

Question 15 Not answered

What does ExecStart define?

The command used to start the service The boot target only The service log location only The user password

Explanation: ExecStart specifies the exact command or program systemd runs to start the service.

Question 16 Not answered

What does WantedBy=multi-user.target usually mean in the [Install] section?

Start this service when the system reaches multi-user mode, if enabled Only root can run this command manually The service must never start at boot The service is a graphical desktop application only

Explanation: WantedBy controls where the service is linked when enabled. multi-user.target is common for server services.

Question 17 Not answered

Where should an administrator usually place a custom systemd unit file?

/etc/systemd/system/ /tmp/systemd/ /home/systemd/ /var/log/systemd/

Explanation: /etc/systemd/system/ is commonly used for admin-created or customized unit files.

Question 18 Not answered

Which command shows the current default target?

systemctl get-default systemctl target-current journalctl get-target targetctl show

Explanation: systemctl get-default shows whether the system normally boots into multi-user.target, graphical.target, etc.

Question 19 Not answered

Which target is commonly used for command-line multi-user server mode?

multi-user.target graphical.target poweroff.target reboot.target

Explanation: multi-user.target is used for multi-user CLI mode and is common on servers.

Question 20 Not answered

Which target is commonly used for GUI mode?

graphical.target rescue.target basic.target timers.target

Explanation: graphical.target includes multi-user services plus graphical display/login components.

Question 21 Not answered

What does Active: active (running) mean in systemctl status?

The service is currently running The service is disabled at boot The service configuration is missing The service is masked

Explanation: active (running) means the service process is currently running successfully.

Question 22 Not answered

What does a masked service mean?

The service is completely blocked from starting The service is running in background only The service starts every minute The service logs are hidden

Explanation: Masking links the unit to /dev/null and prevents it from being started until it is unmasked.

Question 23 Not answered

Which command checks whether a service is enabled at boot?

systemctl is-enabled nginx systemctl is-active nginx journalctl is-enabled nginx ps -p nginx

Explanation: is-enabled checks boot enablement. is-active checks current running state.

Question 24 Not answered

Which command checks whether a service is currently active?

systemctl is-active nginx systemctl is-enabled nginx systemctl get-active-target nginx journalctl active nginx

Explanation: is-active tells whether a unit is currently active/running.

Question 25 Not answered

What is a good first troubleshooting step when a service fails?

Check systemctl status and journalctl logs Delete the service file immediately Reinstall the entire operating system Disable all services

Explanation: A good troubleshooting flow starts with systemctl status and journalctl logs to understand the failure reason.

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