Uploaded March 2025 | Updated September 2026, 2 weeks ago

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How To Configure Basic Settings for NixOS

NixOS is a declarative, reproducible, and immutable Linux distribution built around the Nix package manager. Unlike traditional Linux distributions, where system configurations are managed imperatively (by editing files manually), NixOS uses a single configuration file (/etc/nixos/configuration.nix) to define the entire system state.

This makes NixOS ideal for servers, home labs, and developers who want a consistent, reproducible environment.

🔹 Key Features of NixOS
📜 Declarative Configuration – All settings are defined in configuration.nix.
♻️ Rollback Support – Easily revert changes using generation-based system management.
📦 Atomic Upgrades – No partial upgrades; everything is built as a complete system.
🔄 Reproducibility – Identical configurations produce identical results on any machine.
🚀 Flexible Package Management – Supports multiple package versions using Nix.

Basic Configuration in NixOS
Since you are running NixOS as a VM in Proxmox with UEFI and Hyprland, here’s how to configure basic settings like a static IP and installing QEMU guest agent.

1️⃣ Configure a Static IP Address
NixOS manages networking declaratively via configuration.nix.
Steps to Set a Static IP:
Open the configuration file:
sudo nano /etc/nixos/configuration.nix
Add or modify the networking section:
networking = {
useDHCP = false;
interfaces.enp0s18 = {
ipv4.addresses = [
{
address = "192.168.1.100"; # Change to your desired IP
prefixLength = 24;
}
];
ipv4.routes = [
{
address = "0.0.0.0";
prefixLength = 0;
via = "192.168.1.1"; # Replace with your gateway/router IP
}
];
};
};
Replace enp0s18 with your actual network interface (find it with ip a).
Update the IP, subnet, and gateway based on your network.
Apply the changes:
sudo nixos-rebuild switch
Verify with:
ip a

2️⃣ Install and Enable QEMU Guest Agent
Since you’re running NixOS in Proxmox, you should install the QEMU guest agent to enable features like proper shutdown, memory ballooning, and IP reporting.

Steps to Install and Enable QEMU Guest Agent:
Edit configuration.nix:
sudo nano /etc/nixos/configuration.nix
Add the following under services:
services.qemuGuest.enable = true;
Apply the changes:
sudo nixos-rebuild switch
Check if the guest agent is running:
systemctl status qemu-guest-agent



Resources & Links:
nixos.org/manual/nixos/stable
nixos.org
proxmox.com/en











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#NixOS #proxmox #linux