69 lines
2.5 KiB
Markdown
69 lines
2.5 KiB
Markdown
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# Raspberry Pi 5 (`lyrathorpe-rpi5`)
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Headless `aarch64-linux` server with two roles:
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- **Docker host** — daemon exposed over the network (`docker.nix`).
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- **nginx reverse proxy** — declarative `virtualHosts` (`reverse-proxy.nix`).
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## Install
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1. Flash a NixOS `aarch64` SD image (or USB) and boot the Pi. The
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`raspberry-pi-5` profile from `nixos-hardware` (wired in the flake host table)
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supplies the kernel, firmware and device tree; boot is U-Boot + extlinux.
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2. Partition/mount the target, then **regenerate the hardware config on the
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device** and replace the committed placeholder:
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```sh
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nixos-generate-config --root /mnt
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# copy /mnt/etc/nixos/hardware-configuration.nix over
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# system/machine/RPi5/hardware-configuration.nix in this repo, then commit
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```
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`hardware-configuration.nix` in this directory is a **placeholder** committed
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only so the host evaluates in CI. The machine will not boot correctly until it
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is replaced with the generated one.
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3. Set the host name to match the flake attribute (already done in
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`configuration.nix`: `lyrathorpe-rpi5`) and build:
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```sh
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sudo nixos-rebuild switch --flake .#lyrathorpe-rpi5
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# or, once the hostname is live:
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nh os switch
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```
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4. Give the login user a password (`passwd lyrathorpe`) and confirm the key in
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`system/modules/ssh.nix` is the one you will connect with.
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## Docker socket (security)
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The daemon listens on **plain TCP `2375`, no TLS, no auth**. Access is
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root-equivalent on this host. The only protection is the nftables rule in
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`docker.nix`, which accepts `2375` **only** from the trusted LAN subnet
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(`10.187.1.0/24` by default — change it to match your network). Do not widen
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that subnet to anything untrusted.
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From a LAN client:
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```sh
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export DOCKER_HOST=tcp://lyrathorpe-rpi5:2375
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docker info
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```
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The secure upgrade path is mutual TLS on `2376` (`--tlsverify` with a CA and
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client certs); it needs out-of-band cert provisioning and is intentionally not
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wired here.
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## Adding a reverse-proxy site
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Each proxied service is a Nix entry in `reverse-proxy.nix`:
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```nix
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services.nginx.virtualHosts."app.example.lan" = {
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# enableACME = true; forceSSL = true; # once a DNS name + cert exist
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locations."/" = {
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proxyPass = "http://127.0.0.1:8080"; # e.g. a local container
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proxyWebsockets = true;
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};
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};
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```
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The example vhost is HTTP-only by design. Turn on `enableACME`/`forceSSL`
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per-vhost once the host has a real DNS name and the ACME challenge can be met;
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`443` is already open in the firewall.
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