🧪 NixOS Configuration Setup

This repository contains a complete configuration.nix setup for my personal NixOS system, including:

• Preconfigured configuration.nix
• Hardware-specific modules (e.g., for NVIDIA graphics)
• File system mount instructions (including additional HDDs)

---

⚙️ Steps to Use This Configuration

✅ 1. Install NixOS Fresh

When installing NixOS:

• Choose "Erase disk" option for the main NVMe drive.
• This ensures configuration.nix and hardware-configuration.nix are generated cleanly with NVMe boot settings.

---

🧰 2. Install Git and Clone the Repo

After installation:

nix-shell -p git
git clone https://github.com/prajjwalkumar17/nixos.git

---

🛠️ 3. Replace System Config

Do the following in /etc/nixos:

cd /etc/nixos
cp ~/nixos/configuration.nix .
cp -r ~/nixos/modules .

---

🧩 4. Set Up Additional HDD Partitions

🔍 Identify Drives

lsblk -f

Look for non-NVMe entries (e.g., /dev/sda1, /dev/sda2) and note:

• UUID
• Filesystem (e.g., ext4, swap)
• Mount point (if any)

Example output:

NAME   FSTYPE LABEL UUID                                 MOUNTPOINT
sda
├─sda1 ext4         a1b2c3d4-e5f6-7890-abcd-1234567890ab 
└─sda2 swap         1234abcd-56ef-7890-1234-abcdefabcdef [SWAP]

---

✍️ Update hardware-configuration.nix

Add entries like:

fileSystems."/home/yourname/work" = {
  device = "/dev/disk/by-uuid/a1b2c3d4-e5f6-7890-abcd-1234567890ab";
  fsType = "ext4";
};

fileSystems."/home/yourname/utility" = {
  device = "/dev/disk/by-uuid/a1b2c3d4-e5f6-7890-abcd-1234567890ab";
  fsType = "ext4";
};

swapDevices = [
  { device = "/dev/disk/by-uuid/1234abcd-56ef-7890-1234-abcdefabcdef"; }
];

📂 Create Mount Directories

Create directories for mounting:

mkdir -p /home/yourname/work
mkdir -p /home/yourname/utility

These paths will be used as mount points for your HDD.

---

🔁 5. Rebuild Your System

sudo nixos-rebuild switch

---

📁 Project Structure

nixos/
├── configuration.nix       # Main config file to replace /etc/nixos/configuration.nix
└── modules/                # Optional modules (e.g., NVIDIA-specific setup)

---

🪪 License

MIT — Feel free to fork and reuse.