102 lines
3.2 KiB
Markdown
102 lines
3.2 KiB
Markdown
# Bootstrapping
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This will help you boostrap a bare host with the help of the
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[bespoke iso](./iso.md) live installer.
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_Note: nothing prevents you from remotely executing the boostrapping
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process. See below._
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Once your target host has booted into the live iso, you need to partition
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and format your disk according to the [official manual][manual].
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## Mount partitions
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Then properly mount the formatted partitions at `/mnt`, so that you can
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install your system to those new partitions.
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Mount `nixos` partition to `/mnt` and — for UEFI — `boot`
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partition to `/mnt/boot`:
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```console
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$ mount /dev/disk/by-label/nixos /mnt
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$ mkdir -p /mnt/boot && mount /dev/disk/by-label/boot /mnt/boot # UEFI only
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$ swapon /dev/disk/by-label/swap
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```
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Add some extra space to the store. In the iso, it's running on a tmpfs
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off your RAM:
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```console
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$ mkdir -p /mnt/tmpstore/{work,store}
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$ mount -t overlay overlay -olowerdir=/nix/store,upperdir=/mnt/tmpstore/store,workdir=/mnt/tmpstore/work /nix/store
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```
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## Install
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Install off of a copy of devos from the time the iso was built:
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```console
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$ cd /iso/devos
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$ nixos-install --flake .#NixOS
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```
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## Notes of interest
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### Remote access to the live installer
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The iso live installer comes preconfigured with a network configuration
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which announces it's hostname via [MulticastDNS][mDNS] as `hostname.local`,
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that is `bootstrap.local` in the [iso example](./iso).
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In the rare case that [MulticastDNS][mDNS] is not availabe or turned off
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in your network, there is a static link-local IPv6 address configured to
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`fe80::47`(mnemonic from the letter's position in the english alphabet:
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`n=14 i=9 x=24; 47 = n+i+x`).
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Provided that you have added your public key to the authorized keys of the
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`root` user _(hint: [`deploy-rs`](../integrations/deploy.md) needs passwordless
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sudo access)_:
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```nix
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{ ... }:
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{
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users.users.root.openssh.authorizedKeys.keyFiles = [
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../secrets/path/to/key.pub
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];
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}
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```
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You can then ssh into the live installer through one of the
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following options:
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```console
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ssh root@bootstrap.local
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ssh root@fe80::47%eno1 # where eno1 is your network interface on which you are linked to the target
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```
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_Note: the [static link-local IPv6 address][staticLLA] and [MulticastDNS][mDNS] is only
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configured on the live installer. If you wish to enable [MulticastDNS][mDNS]
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for your environment, you ought to configure that in a regular [profile](../concepts/profiles.md)._
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### EUI-64 LLA & Host Identity
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The iso's IPv6 Link Local Address (LLA) is configured with a static 64-bit Extended
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Unique Identifiers (EUI-64) that is derived from the host interface's Message
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Authentication Code (MAC) address.
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After a little while (a few seconds), you can remotely discover this unique and host
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specific address over [NDP][NDP] for example with:
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```console
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ip -6 neigh show # also shows fe80::47
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```
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***This LLA is stable for the host, unless you need to swap that particular network card.***
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Under this reservation, though, you may use this EUI-64 to wire up a specific
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(cryptographic) host identity.
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[manual]: https://nixos.org/manual/nixos/stable/index.html#sec-installation-partitioning
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[mDNS]: https://en.wikipedia.org/wiki/Multicast_DNS
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[NDP]: https://en.wikipedia.org/wiki/Neighbor_Discovery_Protocol
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[staticLLA]: https://tools.ietf.org/html/rfc7404
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