RHCSA Systemd and Service Management Flashcards

Which systemd unit type is used to mount a filesystem defined in /etc/fstab at a specific path?

Answer: .mount

`.mount` units represent filesystem mount points and correspond to entries in `/etc/fstab`.

What is the purpose of `systemd-analyze blame`?

Answer: Lists each unit and the time it took to initialize during boot

`systemd-analyze blame` shows each service unit's initialization time, helping identify boot bottlenecks.

A `Type=forking` service unit is used when the process does what?

Answer: Daemonizes by forking and having the parent exit

`Type=forking` is for traditional daemons that fork a child process and exit the parent; systemd tracks the child.

Which command creates a systemd override file for `httpd.service` using a text editor?

Answer: systemctl edit httpd.service

`systemctl edit httpd.service` opens an editor for a drop-in override file without replacing the original unit.

What does `systemctl kill -s SIGKILL httpd.service` do differently from `systemctl stop httpd.service`?

Answer: It sends SIGKILL directly to all processes in the service's cgroup, bypassing ExecStop=

`systemctl kill` sends a signal directly to all cgroup members, while `stop` runs the `ExecStop=` sequence.

In a systemd `.socket` unit, which directive specifies the port or path the socket listens on?

Answer: ListenStream=

`ListenStream=` in a `.socket` unit defines the TCP port or Unix socket path for stream (TCP) socket activation.

Which target is equivalent to traditional runlevel 3 (multi-user, no GUI)?

Answer: multi-user.target

`multi-user.target` is the systemd equivalent of SysV runlevel 3: full multi-user mode without a graphical interface.