Use less memory for service qubes

[ben-grande]

Current problem (if any)

Many OSes are running a lot of services that aren't required for each qube.

Proposed solution

Use services supported by upstream such as minimal-netvm and minimal-usbvm that selectively disable services.

The PR to add the minimal service features was merged 15-02:

• Enable minimal netvm/usbvm services QubesOS/qubes-mgmt-salt-dom0-virtual-machines#70

But the OOM killer issue mentioned on 19-02:

• SystemD dropins for minimal sys-net and sys-usb QubesOS/qubes-core-agent-linux#540 (comment)

The PR to remove nsrecoursedb was merged on 24-02:

• Disable systemd-nsresourced and systemd-userdbd for minimal sys-net and minimal sys-usb QubesOS/qubes-core-agent-linux#554

Our template is minimal while upstream uses templates with way more packages and services running and GUI applications that consume more resources such as Xfce terminal and Gnome terminal instead of XTerm. But even then, it is best to wait a bit till people start testing it upstream and see if more problem arises.

The value to a user, and who that user might be

Running more qubes on resource constrained machines.

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Note: This issue was split to

• Disable gui feature of qubes that don't need it #117

Else, it would be impossible to complete this issue without waiting for upstream.

[Atrate]

Check which qubes needs the gui feature enabled:

As for a sys qube that will probably need gui, I'd add sys-audio, for pasystray and sometimes pavucontrol.