Install Nix on Fedora 44

Updated

September 4, 2026

Install Nix on Fedora 44

Goal: Install Nix from Fedora’s official packages, enable the daemon (or choose single-user/rootless deliberately), verify flakes, and know where Fedora documents live on disk.

Important

Prefer dnf install nix on Fedora 44+ over the classic curl | sh upstream installer unless you have a specific reason (custom builds, non-Fedora policy). The distro package is the supported path for SELinux and /nix integration.

Prerequisites

Need Check
Fedora 44 (or current release with nix in repos) cat /etc/os-release
sudo Wheel user
Disk Prefer ≥20 GB free on the filesystem that will hold /nix
Network For first substitutes from cache.nixos.org 
free -h
df -h /
# or wherever /nix will live

Install modes (choose one)

Fedora packaging supports several setups (see package docs):

Mode Install sketch Who builds Best for
Multi-user + daemon (recommended) dnf install nix + enable nix-daemon nixbld users via daemon Desktops, shared machines, matches NixOS mental model
Single-user install excluding daemon / singleuser subpackage Your UID Solo laptops if daemon undesired
Rootless / Atomic special /nix storage (bind mount) Your UID / constrained Silverblue, Kinoite, bootc images

This chapter emphasizes multi-user daemon on classic Workstation/Server, then notes Atomic.

Multi-user install (Workstation / Server)

1. Install packages

sudo dnf install -y nix

On some releases you may see related packages (nix-daemon, docs). Let dnf pull the recommended set.

rpm -q nix
rpm -ql nix | head
ls /usr/share/doc/nix/ 2>/dev/null || true

Read the Fedora-specific README if present:

less /usr/share/doc/nix/README.fedora.md
# or
rpm -qd nix

2. Enable the daemon

sudo systemctl enable --now nix-daemon.service
systemctl status nix-daemon --no-pager

3. Groups and shell environment

Multi-user installs typically put builders in nixbld and may require your user in a group to talk to the daemon. Fedora’s README is authoritative; common pattern:

# If docs say so:
getent group nixbld
groups   # ensure you can use nix after re-login

Log out/in or open a new login shell so profile snippets from /etc/profile.d/ or /nix/... apply.

# Common: bash/zsh pick up nix from profile.d
bash -l -c 'command -v nix && nix --version'

4. First smoke test

nix --version
nix doctor || true

# Classic hello (works even if you still learn modern CLI)
nix-shell -p hello --run hello

# Modern CLI + flakes (Fedora enables flakes in packaging — verify):
nix show-config | rg -n 'experimental-features|flakes|nix-command' || true
nix run nixpkgs#hello

If nix run nixpkgs#hello works, flakes + substitutes are alive.

Configure system vs user

Daemon / system config

Multi-user security options often live in /etc/nix/nix.conf (read by the daemon). Examples operators care about:

# Inspect effective config
nix show-config | rg -n 'sandbox|experimental|substituter|trusted'

# Example: ensure sandbox (security) — only if not already set by package defaults
# sudo tee -a /etc/nix/nix.conf <<'EOF'
# sandbox = true
# EOF
# sudo systemctl restart nix-daemon
Warning

Do not casually set trusted-users = * or disable sandbox “to go faster” on a daily driver. Prefer package defaults; change with intent.

User config

mkdir -p ~/.config/nix

Fedora may already enable flakes system-wide. If nix flake fails, set:

cat >> ~/.config/nix/nix.conf <<'EOF'
experimental-features = nix-command flakes
EOF

Re-check:

nix show-config | rg experimental-features

Single-user mode (optional)

When you intentionally avoid the daemon (read Fedora docs for exact package names):

# Illustrative — confirm package set on your release:
# sudo dnf install nix --exclude nix-daemon
# or: sudo dnf install nix-singleuser

Typical consequences:

  • Builds run as your user
  • Socket/daemon workflow differs
  • Closer to “my laptop only,” farther from NixOS’s always-daemon world

If you plan NixOS soon, prefer multi-user so daemon habits match.

Atomic / immutable desktops (Silverblue, Kinoite, bootc)

Immutable systems often make /nix not writable as a normal directory. Community patterns:

  1. Store data under /var/nix (writable)
  2. Bind-mount /var/nix → /nix (Nix rejects a mere symlink for the store root in many setups)

Example systemd mount unit (adapt paths; verify against current Atomic guidance):

# /etc/systemd/system/nix.mount  (illustrative)
[Unit]
Description=Bind mount /var/nix to /nix

[Mount]
What=/var/nix
Where=/nix
Type=none
Options=bind

[Install]
WantedBy=local-fs.target
sudo mkdir -p /var/nix /nix
sudo systemctl daemon-reload
sudo systemctl enable --now nix.mount
# then install/enable nix packages per Atomic docs

Also expect SELinux labeling steps on some images. Prefer Fedora documentation and the nix package README over blog posts when they disagree.

Verify deeply (acceptance checklist)

# Binary + version
nix --version

# Daemon (multi-user)
systemctl is-active nix-daemon

# Store exists and is a directory (not a broken symlink)
findmnt /nix || ls -ld /nix
df -h /nix

# Flake metadata (network)
nix flake metadata nixpkgs --json | head -c 200; echo

# Build something small and inspect store path
nix build nixpkgs#hello --print-out-paths
nix path-info -r $(nix build nixpkgs#hello --print-out-paths) | head

Record versions in your lab notes:

mkdir -p ~/lab/nixos-book/nix-on-linux
{
  echo "date: $(date -Iseconds)"
  echo "os: $(. /etc/os-release; echo $PRETTY_NAME)"
  nix --version
  rpm -q nix
  systemctl is-active nix-daemon || echo "daemon inactive"
} | tee ~/lab/nixos-book/nix-on-linux/install-record.txt

Upstream installer vs Fedora package

Fedora dnf package Upstream multi-user script
SELinux Integrated for Fedora Often needs extra steps
Updates dnf upgrade Separate Nix upgrade story
Flakes Packaged defaults (enabled OOTB historically) You enable experimental features
Support story Fedora + Nix communities Nix upstream
Custom Nix builds Harder Easier

You can still use nixpkgs the same way either way. This book assumes Fedora packaging on F44+.

Uninstall / reset notes

If you need a clean slate (lab machine):

# Stop daemon first
sudo systemctl disable --now nix-daemon 2>/dev/null || true
# Remove packages
sudo dnf remove nix
# WARNING: deleting the store removes all Nix software
# sudo rm -rf /nix

Only wipe /nix if you accept redownloading everything.

Common failures

Symptom Likely cause Direction
nix: command not found No login shell / PATH New login; check profile.d
Cannot connect to daemon nix-daemon down; permissions systemctl status nix-daemon; groups
Flakes experimental error features not enabled ~/.config/nix/nix.conf or /etc/nix/nix.conf
SELinux denials Mislabel / non-Fedora install ausearch -m avc -ts recent; prefer dnf package
/nix read-only Atomic without bind mount Atomic section above
Disk full during build Store on small root Move store / free space / GC later chapter

Lab

  1. Complete multi-user install on Fedora 44.
  2. Capture install-record.txt as above.
  3. Run nix run nixpkgs#cowsay -- "fedora+nix".
  4. Skim /usr/share/doc/nix/ and note three Fedora-specific warnings in your lab journal.

Checkpoint

  • nix run nixpkgs#hello succeeds
  • Daemon mode intentional (or single-user/rootless documented)
  • You know where system vs user nix.conf live
  • Free space plan for /nix written down

Further depth