VM Creations on libvirt

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I stumbled upon your question as I was looking for something similar. Continuing the search, I ended up boiling it down to the following options:

  • Use libvirt as described in Libvirt - NixOS Wiki : with the NixOS module to setup the host, and leverage virsh to manage networks and clients;
  • NixVirt (from @AshleyYakeley) that seems to allow to declaratively manage networks and clients (domains in libvirt terminology) through XML;
  • MicroVM.nix (from @astro) that seems to provide another layer of abstraction for declaration as nix code, supports multiple virtual machines backends (hypervisor-ish), and also ships a module for managing the running of said VMs on a host - c.f. NixCon 2023 presentation.
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