RHCSA RHCSA Systemd and Service Management 3

Question 1

Which journalctl option limits output to messages from the current boot only?

Accepted Answer

-b

Answer

`journalctl -b` (or `--boot`) shows log entries from the current boot session.

Question 2

A service unit's `ExecStart=` line begins with a `-` (dash) before the command path. What does this mean?

Accepted Answer

A non-zero exit code from the command is ignored

Answer

A leading `-` in `ExecStart=` tells systemd to ignore a failure (non-zero exit) of that command.

Question 3

What does the `systemctl isolate rescue.target` command do?

Accepted Answer

Immediately switches the running system to rescue.target, stopping all non-essential services

Answer

`systemctl isolate` switches the active target immediately, stopping all units not required by the new target.

Question 4

Where should custom drop-in configuration files for an existing systemd unit be placed?

Accepted Answer

/etc/systemd/system/<unit>.d/

Answer

Drop-in override files go in `/etc/systemd/system/<unit>.d/` as `*.conf` files so they survive package updates.

Question 5

Which `systemctl` command shows the current default boot target?

Accepted Answer

systemctl get-default

Answer

`systemctl get-default` prints the symlink destination of `default.target`.

RHCSA Exam Practice Test