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Are all (or most) of the services managed by systemd (or sysvinit) implemented based on sockets (either internet or unix domain sockets)?

I have this question, because I am not sure what the concept "service" is. I guess it means a server that communicates with its clients via sockets?

Thanks.

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  • No strictly defined concept. For systemd, it's the . service units, or say the corresponding runtime cgroups. Services are implemented all by their own, sockets may or may not be involved. Commented Mar 21, 2019 at 1:33

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A systemd service is just something that systemd can run and manage. So, for example, systemd-firstboot.service is a service that is started the first time after the system is installed, and it performs some configuration, then stops. systemd-fsck-root.service will check the root disk on reboot. And so on.

A fair number of services act as servers (eg cups.service) but not all.

From man systemd.service

   A unit configuration file whose name ends in .service encodes
   information about a process controlled and supervised by systemd.
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