Feature Request: Declarative configuration of Virt Manager's networks

Development
1

Is it possible to extend virtualisation.libvirtd and let users declare their networks there:

virtualisation.libvirtd = {
    enable = true;
    networks = {
        default = {
            network: "192.168.122.0/24";
            autostart: false;
        };
        
        custom = {
            network: "172.16.0.0/24";
            autostart: true;
        };
    };
};

Relevant screenshots:

Virtual Networks
Virtual Networks1048×837 93.6 KB

Create a new virtual network
Create a new virtual network671×840 85.9 KB

2

Thanks. By the way, there’s this project:

Never tried it.

2 Likes
3

Can confirm that nixvirt lets you add those declaratively. Little fiddly backing into the definitions you need via the XML virtman wants, but it works.

4

It would be great if the customizations could be done via NixOS’s own virtualisation.libvirtd—if in terms of NixOS’s philosophy it’s acceptable.

5

Is that not exactly what NixVirt lets you do?

6

I mean I want to do it without using NixVirt, just by using these options.

Maybe one of the options can be used to declare networks, or generate something like this:

<network>
  <name>default</name>
  <uuid>caf114ad-0a11-49b7-a518-520870661205</uuid>
  <forward mode="nat">
    <nat>
      <port start="1024" end="65535"/>
    </nat>
  </forward>
  <bridge name="virbr0" stp="on" delay="0"/>
  <mac address="54:55:00:c2:2c:44"/>
  <ip address="192.168.122.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.122.2" end="192.168.122.254"/>
    </dhcp>
  </ip>
</network>
<!-- ... -->

but I can’t seem to find it.

1 Like