this post was submitted on 06 Jun 2025
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Systemd, through the
systemctlcommand, only manages the services. The service itself is defined in a unit file, and it can come from any source, even written manually. The unit file is a text file that describes what the service is, what commands or programs should be executed when it starts or stops (forsshdit's/usr/bin/sshd -D), what other services or conditions are required (e.g.multi-user.targetafter the OS has entered multi-user mode), and much more.When a package installs a unit file, it will be installed to a subdirectory in
/usr/lib/systemd, typicallyuserorsystem, and when it is enabled, it will be symlinked to a subdirectory in/etc/systemd.OpenSSH itself, which provides
sshdon most systems, is developed by the OpenBSD team and ported to other OSes by the OpenSSH Portability Team.That makes a lot of sense. I actually wrote my own unit files for Jackett and to autostart a virtual machine and moved them into multi-user target wants using the enable command. I guess my thought was that by adding the unit file to systemd it made the program part of systemd in a way but now that I think more about it, saying any of these programs are part of systemd doesn't actually make sense. Just because sshd came pre-installed with Ubuntu doesn't make it part of systemd any more than plex is part of systemd.
Thanks for helping me understand!