Multi-user installation (recommended)

Install Nix via the recommended multi-user installation:

$ sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --daemon

We recommend the multi-user install if you are on Linux running systemd, with SELinux disabled and you can authenticate with sudo.

Single-user installation

Install Nix via the single-user installation:

$ sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install) --no-daemon

Above command will perform a single-user installation of Nix, meaning that nix is owned by the invoking user. You should run this under your usual user account, not as root. The script will invoke sudo to create /nix if it doesn’t already exist.

Which type of installation should you choose?

This depends on your requirements, but here is a short list of reasons why we recommend multi-user installation:

Pros

• Better build isolation (and that is what Nix is all about)
• Better security (a build can not write somewhere in your home)
• Sharing builds between users

Cons

• Requires root to run the daemon
• More involved installation (creation of nixbld* users, installing a systemd unit, …
• Harder to uninstall

Multi-user installation

Updating to macOS 15 Sequoia

If you recently updated to macOS 15 Sequoia and are getting

error: the user '_nixbld1' in the group 'nixbld' does not exist

when running Nix commands, refer to GitHub issue NixOS/nix#10892 for instructions to fix your installation without reinstalling.

Install Nix via the recommended multi-user installation. Open a Terminal (by pressing [Cmd] + [Space] and typing terminal) and run the following command:

$ sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install)

We believe we have ironed out how to cleanly support the read-only root on modern macOS. Please consult the manual on details what the installation script does.

Start a Docker shell with Nix:

$ docker run -it nixos/nix

Or start a Docker shell with Nix exposing a workdir directory:

$ mkdir workdir
$ docker run -it -v $(pwd)/workdir:/workdir nixos/nix

The workdir example from above can be also used to start hacking on nixpkgs:

$ git clone --depth=1 https://github.com/NixOS/nixpkgs.git
$ docker run -it -v $(pwd)/nixpkgs:/nixpkgs nixos/nix
docker> nix-build -I nixpkgs=/nixpkgs -A hello nixpkgs/default.nix
docker> find ./result # this symlink points to the build package

The following release items are also available:

• Release notes
• Manual. Please read the “Quick Start” section of the manual for an overview of how to install and use Nix.
• Old releases are also available.

NixOS AMIs

NixOS can be deployed to Amazon EC2 using our official AMI. We publish AMIs to all AWS regions for both x86_64 and arm64 on a weekly basis.

We will start deprecating and garbage collecting images older than 90 days in the future. This is why we suggest using a terraform data source or the AWS API to query for the latest AMI.

Via Terraform / OpenTofu

You can easily query for the latest AMI using a data source:

provider "aws" {
  region = "eu-central-1"
}

data "aws_ami" "nixos_arm64" {
  owners      = ["427812963091"]
  most_recent = true

  filter {
    name   = "name"
    values = ["nixos/25.11*"]
  }
  filter {
    name   = "architecture"
    values = ["arm64"] # or "x86_64"
  }
}

resource "aws_instance" "nixos_arm64" {
  ami           = data.aws_ami.nixos_arm64.id
  instance_type = "t4g.nano"
}

Via Command Line / AWS API

The DescribeImages API can be used to query the latest AMI too:

aws ec2 describe-images --owners 427812963091  --filter 'Name=name,Values=nixos/25.11*' 'Name=architecture,Values=arm64' --query 'sort_by(Images, &CreationDate)'

Search for specific AMIs

You can also use the Image searcher to find a specific AMI. Do note that we intend to deprecate images older than 90 days automatically and we do not recommend hardcoding AMI ids.

The following release items are also available:

• Release notes

• Manual.

• Old releases are also available.