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README.md
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README.md
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<img src="https://raw.githubusercontent.com/numtide/nixos-anywhere/5bdd3f3c442b923813e301b319290305353a3e7a/docs/logo.png" width="256" height="256">
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nixos-anywhere (formally known as nixos-remote) makes it possible to install nixos from Linux machines reachable via ssh.
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Under the hood uses a [kexec image](https://github.com/nix-community/nixos-images#kexec-tarballs) to boot
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into a NixOS installer from a running Linux system.
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It then uses [disko](https://github.com/nix-community/disko) to partition and
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format the disks on the target system before it installs the user provided nixos
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nixos-anywhere (formally known as nixos-remote) makes it possible to install
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nixos from Linux machines reachable via ssh. Under the hood uses a
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[kexec image](https://github.com/nix-community/nixos-images#kexec-tarballs) to
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boot into a NixOS installer from a running Linux system. It then uses
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[disko](https://github.com/nix-community/disko) to partition and format the
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disks on the target system before it installs the user provided nixos
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configuration.
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## Requirements
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@ -20,16 +21,21 @@ If your system is not booted into a nixos installer than the following
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requirements apply for kexec to succeed:
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- x86_64 Linux system with kexec support (most x86_64 machine do have kexec
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support) or you have to provide your own [image](https://github.com/numtide/nixos-anywhere#using-your-own-kexec-image)
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support) or you have to provide your own
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[image](https://github.com/numtide/nixos-anywhere#using-your-own-kexec-image)
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- At least 2.5GB RAM (swap does not count). If you do not have enough RAM you
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will see failures unpacking the initrd), this is because kexec needs to load
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the whole nixos into memory.
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## Usage
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Needs a repo with your configurations with flakes. For a minimal example checkout https://github.com/numtide/nixos-anywhere-examples.
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Your NixOS configuration will also need a [disko](https://github.com/nix-community/disko) configuration as we can see in
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our [example](https://github.com/numtide/nixos-anywhere-examples/blob/9768e438b1467ec55d42e096860e7199bd1ef43d/flake.nix#L15-L19)
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Needs a repo with your configurations with flakes. For a minimal example
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checkout https://github.com/numtide/nixos-anywhere-examples.
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Your NixOS configuration will also need a
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[disko](https://github.com/nix-community/disko) configuration as we can see in
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our
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[example](https://github.com/numtide/nixos-anywhere-examples/blob/9768e438b1467ec55d42e096860e7199bd1ef43d/flake.nix#L15-L19)
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Afterwards you can just run:
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@ -41,7 +47,8 @@ The parameter passed to `--flake` should point to your nixos configuration
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exposed in your flake (`nixosConfigurations.your-system` in the example above).
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`nixos-anywhere --help`
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``` shell
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```shell
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Usage: nixos-anywhere [options] ssh-host
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Options:
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@ -76,10 +83,12 @@ Options:
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## Using your own kexec image
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By default `nixos-anywhere` will download the kexec image from [here](https://github.com/nix-community/nixos-images#kexec-tarballs).
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It is also possible to provide your own by providing a file to `--kexec`. The image will than uploaded prior to executing.
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By default `nixos-anywhere` will download the kexec image from
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[here](https://github.com/nix-community/nixos-images#kexec-tarballs). It is also
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possible to provide your own by providing a file to `--kexec`. The image will
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than uploaded prior to executing.
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``` shell
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```shell
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nixos-anywhere \
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--kexec "$(nix build --print-out-paths github:nix-community/nixos-images#packages.x86_64-linux.kexec-installer-nixos-unstable)/nixos-kexec-installer-x86_64-linux.tar.gz" \
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--flake 'github:your-user/your-repo#your-system' \
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@ -87,10 +96,10 @@ nixos-anywhere \
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```
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`--kexec` can be useful for example for aarch64-linux, where there is no
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pre-build image. The following example assumes that your local machine can
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build for aarch64-linux either natively or through a remote builder
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pre-build image. The following example assumes that your local machine can build
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for aarch64-linux either natively or through a remote builder
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``` shell
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```shell
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nixos-anywhere \
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--kexec "$(nix build --print-out-paths github:nix-community/nixos-images#packages.aarch64-linux.kexec-installer-nixos-unstable)/nixos-kexec-installer-aarch64-linux.tar.gz" \
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--flake 'your-flake#your-system' \
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