RHCSA RHCSA Systemd and Service Management 2

Question 1

Which systemctl command shows all unit files installed on the system, regardless of their state?

Accepted Answer

systemctl list-unit-files

Answer

systemctl list-units

Answer

systemctl status --all

Answer

systemctl show --all

Question 2

A service unit has `WantedBy=multi-user.target`. What does enabling this service actually create?

Accepted Answer

A symlink in /etc/systemd/system/multi-user.target.wants/

Answer

A copy of the unit file in /run/systemd/

Answer

An entry in /etc/rc.local

Answer

A hard link in /usr/lib/systemd/system/

Question 3

Which directive in a systemd service unit file prevents the service from starting until the network is fully online?

Accepted Answer

After=network-online.target
Wants=network-online.target

Answer

Requires=network.target

Answer

Before=network.target

Answer

BindsTo=network.service

Question 4

What is the effect of running `systemctl mask httpd`?

Accepted Answer

Creates a symlink from the unit file to /dev/null, preventing it from starting

Answer

Disables httpd and removes its unit file

Answer

Stops httpd and marks it as failed

Answer

Moves the unit file to a backup directory

Question 5

Which command displays the dependency tree for the `sshd.service` unit?

Accepted Answer

systemctl list-dependencies sshd.service

Answer

systemctl show sshd.service --deps

Answer

systemctl status sshd.service --tree

Answer

journalctl -u sshd.service --tree

Question 6

A systemd timer unit should run a job every day at 02:30. Which `OnCalendar=` value is correct?

Accepted Answer

*-*-* 02:30:00

Answer

daily 02:30

Answer

0 2 30 * *

Answer

02:30:00 daily

Question 7

Which command reloads systemd's configuration without rebooting after you add a new unit file?

Accepted Answer

systemctl daemon-reload

Answer

systemctl reload

Answer

systemctl restart systemd

Answer

systemctl refresh