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

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Usage documentation is on qvm-service manual page. There are also described predefined services.

Under the hood enabled service in VM is signaled by file in /var/run/qubes-service. This can be used to implement almost enable/disable per-VM switch controlled by dom0. Adding support for systemd services is pretty simple:

1. Disable old service: systemctl disable <service name>

2. Create /etc/systemd/system/<service name>.service file containing:

   .include /lib/systemd/system/<service name>.service
   [Unit]
   ConditionPathExists=/var/run/qubes-service/<service name>
   

3. Enable new service: systemctl enable <service name>.

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