Systemctl isn't the thing that runs your services
systemctl doesn't start your services — it's a client that phones PID 1. A mental model of systemd built from the D-Bus call down to the kernel cgroups that make it all reliable.
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systemctl doesn't start your services — it's a client that phones PID 1. A mental model of systemd built from the D-Bus call down to the kernel cgroups that make it all reliable.