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-unit-files` lists all installed unit files and their enabled/disabled state.

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

`systemctl enable` creates a symlink in the target's `.wants/` directory under `/etc/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

`After=network-online.target` combined with `Wants=network-online.target` ensures the service waits for full network availability.

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

Masking creates a symlink to `/dev/null`, making it impossible to start the service even manually.

Question 5

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

Accepted Answer

systemctl list-dependencies sshd.service

Answer

`systemctl list-dependencies` shows all units that a given unit depends on in a tree format.

RHCSA Exam Practice Test