nixos-config

Personal NixOS configuration using flakes and home-manager.

Structure

nixos-config/
├── flake.nix                         # Entry point — inputs and outputs
├── hosts/
│   └── nixos/
│       ├── configuration.nix         # System configuration
│       └── hardware-configuration.nix # Auto-generated, machine-specific
└── home/
    └── duynguyen/
        └── default.nix               # Home-manager config (user packages, dotfiles)

What's configured

KDE Plasma 6 on Wayland via SDDM
Vietnamese input via fcitx5 + unikey (Telex/VNI)
- After switching, go to System Settings → Virtual Keyboard → select "Fcitx 5"
Locale: English UI, Vietnamese formats (currency, time, etc.), Asia/Ho_Chi_Minh timezone
Pipewire for audio
Packages: firefox, kate, claude-code, git

Reproducing on a fresh machine

1. Install NixOS

Boot the NixOS ISO, partition, and install as normal. During install, choose KDE Plasma if prompted.

2. Enable flakes temporarily

nix-shell -p git --command "bash"
# or just proceed if git is already available

3. Clone this repo

git clone <repo-url> ~/nixos-config
cd ~/nixos-config

4. Replace the hardware config

The hardware-configuration.nix inside hosts/nixos/ is machine-specific. Replace it with your own:

cp /etc/nixos/hardware-configuration.nix ~/nixos-config/hosts/nixos/hardware-configuration.nix

5. Apply the configuration

sudo nixos-rebuild switch --flake ~/nixos-config#nixos

6. Lock the flake inputs

nix flake update

Commit the resulting flake.lock so future rebuilds use the exact same package versions.

Daily usage

Task	Command
Apply system + home changes	`sudo nixos-rebuild switch --flake ~/nixos-config#nixos`
Update all inputs	`nix flake update`
Roll back last switch	`sudo nixos-rebuild switch --rollback`
Search packages	`nix search nixpkgs <name>`

Adding packages

System-wide (available to all users): hosts/nixos/configuration.nix → environment.systemPackages
User-level (home-manager managed): home/duynguyen/default.nix → home.packages
Per-user via NixOS: hosts/nixos/configuration.nix → users.users.duynguyen.packages

Vietnamese input setup (fcitx5)

After first build:

Go to System Settings → Input Devices → Virtual Keyboard
Select Fcitx 5 and apply
In the system tray, right-click the fcitx5 icon → Configure
Add Unikey as an input method
Switch between English/Vietnamese with Super+Space

Unikey supports both Telex (default) and VNI — configure in the Unikey settings.

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