qubes-doc/user/reference/qubes-service.md

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Usage documentation is in the qvm-service man page. There are also described predefined services.

Under the hood, an enabled service in a VM is signaled by a file in /var/run/qubes-service. This can be used to implement an almost enable/disable per-VM switch controlled by dom0.

Adding support for systemd services is pretty simple. In the VM, create the following file (and directory, if needed): /etc/systemd/system/<service name>.service.d/30_qubes.conf. It should contain the following:

[Unit]
ConditionPathExists=/var/run/qubes-service/<service name>

This will cause the service to be started only when you enable it with qvm-service for this VM.