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customization/dispvm-customization.md
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@ -57,6 +57,60 @@ It is possible to change the settings for each new Disposable VM (DispVM). This
4. Shutdown the qube (either by `poweroff` from qube's terminal, or `qvm-shutdown` from dom0 terminal).
### Using static Disposable VMs for sys-* ###
You can use a static DispVM for `sys-*` as long as it is stateless.
For example, a `sys-net` using DHCP or `sys-usb` will work.
In most cases `sys-firewall` will also work, even if you have configured AppVM firewall rules.
The only exception is if you require something like VM to VM communication and have manually edited `iptables` or other items directly inside the firewall AppVM.
To create one that has no PCI devices attached, such as for `sys-firewall`:
~~~
qvm-create -C DispVM -l red <sys-VMName>
qvm-prefs <sys-VMName> autostart true
qvm-prefs <sys-VMName> netvm <sys-net>
qvm-prefs <sys-VMName> provides_network true
~~~
Next, set the old `sys-firewall` autostart to false, and update any references to the old one to instead point to the new.
For example, with `qvm-prefs work netvm sys-firewall2`.
To create one with a PCI device attached such as for `sys-net` or `sys-usb`, use the additional commands as follows.
**Note** You can use `qvm-pci` to [determine](/doc/assigning-devices/#r40) the `<BDF>`.
Also, you will often need to include the `-o no-strict-reset=True` [option](/doc/assigning-devices/#r40-1) with USB controllers.
~~~
qvm-create -C DispVM -l red <sys-VMName>
qvm-prefs <sys-VMName> virt_mode hvm
qvm-service <sys-VMName> meminfo-writer off
qvm-pci attach --persistent <sys-VMName> dom0:<BDF>
qvm-prefs <sys-VMName> autostart true
qvm-prefs <sys-VMName> netvm ''
# optional, if this DispVM will be providing networking
qvm-prefs <sys-VMName> provides_network true
~~~
Next, set the old `sys-` VM's autostart to false, and update any references to the old one.
For example, `qvm-prefs sys-firewall netvm <sys-VMName>`.
See below for a complete example of a `sys-net` replacement:
~~~
qvm-create -C DispVM -l red sys-net2
qvm-prefs sys-net2 virt_mode hvm
qvm-service sys-net2 meminfo-writer off
qvm-pci attach --persistent sys-net2 dom0:00_1a.0
qvm-prefs sys-net2 autostart true
qvm-prefs sys-net2 netvm ''
qvm-prefs sys-net2 provides_network true
qvm-prefs sys-net autostart false
qvm-prefs sys-firewall netvm sys-net2
qubes-prefs clockvm sys-net2
~~~
Note that these types of DispVMs will not show in the Application menu, but you can still get to a terminal if needed with `qvm-run <sys-VMName> gnome-terminal`.
### Adding programs to Disposable VM Application Menu ###
For added convenience, arbitrary programs can be added to the Application Menu of the Disposable VM.