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AGENTS.md
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# AGENTS.md # AGENTS.md
This file teaches AI agents how to navigate and work with this NixOS This file teaches AI agents how to navigate and work with this NixOS configuration repository (`sid.ovh`).
configuration repository (`sid.ovh`).
--- ---
@ -9,14 +8,13 @@ configuration repository (`sid.ovh`).
This is a NixOS flake managing three hosts: This is a NixOS flake managing three hosts:
| Host | IP (Tailscale) | Role | | Host | IP (Tailscale) | Role |
|-------|----------------|---------------------------------------------------| |-------|----------------|------------------------------------------------------|
| `sid` | `100.64.0.6` | VPS — reverse proxy, mail, matrix, headscale | | `sid` | `100.64.0.6` | VPS - reverse proxy, mail, matrix, headscale |
| `rx4` | `100.64.0.10` | Home server — open-webui, forgejo, vaultwarden, … | | `rx4` | `100.64.0.10` | Home server - open-webui, forgejo, vaultwarden, etc. |
| `vde` | `100.64.0.1` | Desktop / workstation (not in use at the moment) | | `vde` | `100.64.0.1` | Desktop / workstation (not in use at the moment) |
Deployment is done via `deploy-rs` through a Forgejo CI pipeline Deployment is done via `deploy-rs` through a Forgejo CI pipeline (`.forgejo/workflows/deploy-configs.yml`).
(`.forgejo/workflows/deploy-configs.yml`).
--- ---
@ -24,25 +22,20 @@ Deployment is done via `deploy-rs` through a Forgejo CI pipeline
### What it is ### What it is
`synix` is the owner's **personal NixOS library flake**, hosted at: `synix` is a **NixOS library flake**, hosted at:
``` ```
https://git.sid.ovh/sid/synix.git https://git.sid.ovh/sid/synix.git
``` ```
It provides: It provides:
- **NixOS modules** (`inputs.synix.nixosModules.*`) — opinionated, - **NixOS modules** (`inputs.synix.nixosModules.*`): opinionated, reusable service configurations used heavily across all three hosts.
reusable service configurations used heavily across all three hosts. - **Home Manager modules** (`inputs.synix.homeModules.*`): desktop / user-space configurations (Hyprland, nixvim, waybar, etc.).
- **Home Manager modules** (`inputs.synix.homeModules.*`) — desktop / - **Packages** (`inputs.synix.packages.<system>.*`, also accessible via the `synix-packages` overlay as `pkgs.synix.*`): custom packages not in nixpkgs.
user-space configurations (Hyprland, nixvim, waybar, …). - **Overlays** (`inputs.synix.overlays.*`): nixpkgs modifications.
- **Packages** (`inputs.synix.packages.<system>.*`, also accessible via - **A utility library** (`inputs.synix.lib` / `lib.utils`): helper functions such as `mkVirtualHost` and `mkReverseProxyOption`.
the `synix-packages` overlay as `pkgs.synix.*`) — custom packages not - **Templates**: starter flake templates for servers, desktops, VMs, etc.
in nixpkgs. - **Apps**: convenience scripts (`deploy`, `rebuild`, `install`, etc.).
- **Overlays** (`inputs.synix.overlays.*`) — nixpkgs modifications.
- **A utility library** (`inputs.synix.lib` / `lib.utils`) — helper
functions such as `mkVirtualHost` and `mkReverseProxyOption`.
- **Templates** — starter flake templates for servers, desktops, VMs, etc.
- **Apps** — convenience scripts (`deploy`, `rebuild`, `install`, …).
### How it is consumed in `sid.ovh` ### How it is consumed in `sid.ovh`
@ -59,16 +52,13 @@ inputs = {
}; };
``` ```
The active branch is **`release-25.11`**, aligned with `nixpkgs` The active branch is **`release-25.11`**, aligned with `nixpkgs` at `nixos-25.11`. A `develop` branch exists for unstable work. A local checkout can be used for testing by switching to the `git+file://` URL.
`nixos-25.11`. A `develop` branch exists for unstable work. A local
checkout can be used for testing by switching to the `git+file://` URL.
--- ---
## `synix` Module Reference ## `synix` Module Reference
All NixOS modules are under `modules/nixos/` in the synix repo and All NixOS modules are under `modules/nixos/` in the synix repo and exposed as `inputs.synix.nixosModules.<name>`.
exposed as `inputs.synix.nixosModules.<name>`.
### Infrastructure / base modules ### Infrastructure / base modules
@ -107,18 +97,13 @@ exposed as `inputs.synix.nixosModules.<name>`.
### Other available modules (not currently active in `sid.ovh`) ### Other available modules (not currently active in `sid.ovh`)
`audio`, `bluetooth`, `amd`, `nvidia`, `jellyfin`, `i2pd`, `audio`, `bluetooth`, `amd`, `nvidia`, `jellyfin`, `i2pd`, `ftp-webserver`, `webPage`, `windows-oci`, `librechat-oci`, `nostr-relay`, `ollama`, `cifsMount`, `hyprland` (NixOS-level), `normalUsers`.
`ftp-webserver`, `webPage`, `windows-oci`, `librechat-oci`,
`nostr-relay`, `ollama`, `cifsMount`, `hyprland` (NixOS-level),
`normalUsers`.
--- ---
## `synix` Packages (`pkgs.synix.*`) ## `synix` Packages (`pkgs.synix.*`)
Custom packages provided by synix and available via the Custom packages provided by synix and available via the `synix-packages` overlay (applied in `modules/nixos/common/overlays.nix`):
`synix-packages` overlay (applied in
`modules/nixos/common/overlays.nix`):
| Package name | What it is | | Package name | What it is |
|-------------------------------|------------| |-------------------------------|------------|
@ -135,15 +120,13 @@ Custom packages provided by synix and available via the
| `pkgs.synix.bulk-rename` | Batch file renaming script | | `pkgs.synix.bulk-rename` | Batch file renaming script |
| `pkgs.synix.pyman` | Python man-page helper | | `pkgs.synix.pyman` | Python man-page helper |
The full list lives in `pkgs/default.nix` in the synix repo. All The full list lives in `pkgs/default.nix` in the synix repo. All packages are also accessible as `inputs.synix.packages.<system>.<name>`.
packages are also accessible as `inputs.synix.packages.<system>.<name>`.
--- ---
## `synix` Utility Library (`lib.utils`) ## `synix` Utility Library (`lib.utils`)
Exposed as `inputs.synix.lib` and merged into the flake's `lib` in Exposed as `inputs.synix.lib` and merged into the flake's `lib` in `flake.nix`:
`flake.nix`:
```nix ```nix
lib = nixpkgs.lib.extend (final: prev: inputs.synix.lib or { }); lib = nixpkgs.lib.extend (final: prev: inputs.synix.lib or { });
@ -170,8 +153,7 @@ virtualHosts."${constants.services.forgejo.fqdn}" = mkVirtualHost {
## How `synix` Modules Are Imported ## How `synix` Modules Are Imported
In each host's `default.nix`, synix modules are imported directly from In each host's `default.nix`, synix modules are imported directly from the `inputs` special arg:
the `inputs` special arg:
```nix ```nix
# hosts/rx4/default.nix # hosts/rx4/default.nix
@ -179,7 +161,7 @@ imports = [
inputs.synix.nixosModules.common # base system config inputs.synix.nixosModules.common # base system config
inputs.synix.nixosModules.device.server # server profile inputs.synix.nixosModules.device.server # server profile
inputs.synix.nixosModules.openssh # hardened SSH inputs.synix.nixosModules.openssh # hardened SSH
# …service-specific modules in hosts/rx4/services/ # service-specific modules in hosts/rx4/services/
]; ];
``` ```
@ -207,18 +189,15 @@ imports = [
| `old-stable-packages` | `nixpkgs-25.05` | `pkgs.old-stable.*` | | `old-stable-packages` | `nixpkgs-25.05` | `pkgs.old-stable.*` |
| `unstable-packages` | `nixos-unstable` | `pkgs.unstable.*` | | `unstable-packages` | `nixos-unstable` | `pkgs.unstable.*` |
`synix` also supplies its own `modifications` overlay `synix` also supplies its own `modifications` overlay (`inputs.synix.overlays.modifications`), merged into the local `modifications` overlay in `overlays/default.nix`.
(`inputs.synix.overlays.modifications`), merged into the local
`modifications` overlay in `overlays/default.nix`.
--- ---
## Centralized Logging Architecture ## Centralized Logging Architecture
All hosts ship their systemd journal to a **central receiver running on All hosts ship their systemd journal to a **central receiver running on `sid`** over HTTP using `systemd-journal-remote` / `systemd-journal-upload`.
`sid`** over HTTP using `systemd-journal-remote` / `systemd-journal-upload`.
### Receiver (`sid`) ### Receiver (local host `pc` which is not part of this flake)
```nix ```nix
services.journald.remote = { services.journald.remote = {
@ -248,19 +227,15 @@ services.journald.upload = {
}; };
``` ```
> **Note:** The upload URL uses `100.64.0.5` — the Tailscale transport > **Note:** The upload URL uses `100.64.0.5` - the Tailscale transport IP for host `pc` (which is not part of this flake). Verify with `ip addr show tailscale0` and `hostname` if you are on host `pc` with IP `100.64.0.5`.
> IP for `sid` (distinct from the advertised IP `100.64.0.6` in
> `constants.nix`; verify with `ip addr show tailscale0` on `sid` if
> queries fail).
This module is applied to **every host** via This module is applied to **every host** via `outputs.nixosModules.common` -> `modules/nixos/common/default.nix`.
`outputs.nixosModules.common` → `modules/nixos/common/default.nix`.
--- ---
## Querying Remote Journals ## Querying Remote Journals
All queries run **on `sid`**, reading from `/var/log/journal/remote/`. All queries run **on `pc`**, reading from `/var/log/journal/remote/`.
### General pattern ### General pattern
@ -293,13 +268,10 @@ journalctl \
``` ```
This works because: This works because:
1. `rx4` uploads its journal to `sid:19532`. 1. `rx4` uploads its journal to `pc:19532`.
2. The receiver stores it under `/var/log/journal/remote/` with 2. The receiver stores it under `/var/log/journal/remote/` with `SplitMode=host`, preserving the `_HOSTNAME` field.
`SplitMode=host`, preserving the `_HOSTNAME` field.
3. `_HOSTNAME=rx4` narrows to that host's entries. 3. `_HOSTNAME=rx4` narrows to that host's entries.
4. `SYSTEMD_UNIT=podman-open-webui.service` targets the OCI container 4. `SYSTEMD_UNIT=podman-open-webui.service` targets the OCI container unit for Open WebUI (defined in `hosts/rx4/services/open-webui-oci.nix`).
unit for Open WebUI (defined in
`hosts/rx4/services/open-webui-oci.nix`).
### Other useful queries ### Other useful queries
@ -308,30 +280,24 @@ This works because:
journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 --no-pager -S "1 hour ago" journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 --no-pager -S "1 hour ago"
# Forgejo on rx4 # Forgejo on rx4
journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 \ journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 SYSTEMD_UNIT=forgejo.service --no-pager -n 50
SYSTEMD_UNIT=forgejo.service --no-pager -n 50
# Vaultwarden on rx4 # Vaultwarden on rx4
journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 \ journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 SYSTEMD_UNIT=vaultwarden.service --no-pager -n 50
SYSTEMD_UNIT=vaultwarden.service --no-pager -n 50
# Nginx on rx4 # Nginx on rx4
journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 \ journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 SYSTEMD_UNIT=nginx.service --no-pager -n 50
SYSTEMD_UNIT=nginx.service --no-pager -n 50
# Matrix-synapse on sid # Matrix-synapse on sid
journalctl -D /var/log/journal/remote/ _HOSTNAME=sid \ journalctl -D /var/log/journal/remote/ _HOSTNAME=sid SYSTEMD_UNIT=matrix-synapse.service --no-pager -n 50
SYSTEMD_UNIT=matrix-synapse.service --no-pager -n 50
# Follow logs live # Follow logs live
journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 \ journalctl -D /var/log/journal/remote/ _HOSTNAME=rx4 SYSTEMD_UNIT=podman-open-webui.service -f
SYSTEMD_UNIT=podman-open-webui.service -f
``` ```
### OCI container unit names ### OCI container unit names
Containers managed by `virtualisation.oci-containers` get units named Containers managed by `virtualisation.oci-containers` get units named `podman-<container-attr>.service`:
`podman-<container-attr>.service`:
| Container attr | Unit name | Host | | Container attr | Unit name | Host |
|------------------------|----------------------------------------|------| |------------------------|----------------------------------------|------|
@ -345,8 +311,7 @@ Containers managed by `virtualisation.oci-containers` get units named
## Permissions ## Permissions
User `sid` must be in both `systemd-journal` and User `sid` must be in both `systemd-journal` and `systemd-journal-remote` to read `/var/log/journal/remote/`:
`systemd-journal-remote` to read `/var/log/journal/remote/`:
```nix ```nix
users.users.sid.extraGroups = [ users.users.sid.extraGroups = [
@ -355,7 +320,7 @@ users.users.sid.extraGroups = [
]; ];
``` ```
Verify with `id sid` on `sid`. Verify with `id sid` on `pc`.
--- ---