nixos

Set up Standalone HVM with kernel ""
Allocate memory
Check allocated IP address : qvm-ls -n

Boot:
qvm-start HVM --cdrom=iso:/home/user/iso/nixos.iso

At root prompt:
systemctl stop netwpork-manager
ifconfig -a
ifconfig eth0 10.137.0.16 
ifconfig eth0 up
route add default gw 10.137.0.6
echo nameserver 9.9.9.9 >> /etc/resolv.conf

Disks:
cfdisk /dev/xvda
Configure disks as required: simplest case would be dos, with one partition in /dev/xvda1
Swap at /dev/xvda2

mkfs.ext4 -L root /dev/xvda1
mkswap -L swap /dev/xvda2

mount /dev/disk/by-label/root /mnt
swapon /dev/disk/by-label/swap

nixos-generate-config --root /mnt
vi /mnt/etc/nixos/configuration.nix

nixos-install

Watch the system download package and install in /mnt
Set root password
adduser user
passwd user
Reboot

On restart Choose new configuration.