# Homepage Dashboard — Adding Machines, Tabs & Services

This guide covers how to add new machines, tabs, and services to the **Homepage**
dashboards on **homeserver-1** (and, by extension, any host that imports the
Homepage module).

## Overview

Homepage (https://gethomepage.dev) is a self-hosted dashboard. All dashboard
configuration lives in Nix and is rendered to YAML files that Homepage reads
at `/etc/homepage-dashboard/`.

| Item | Location |
|------|----------|
| Homepage NixOS module (service wrapper) | `modules/services/homepage.nix` |
| Dashboard definition for homeserver-1 | `hosts/homeserver-1/homepage.nix` |
| Deployed config files | `/etc/homepage-dashboard/{settings,services,widgets}.yaml` |
| API keys / secrets | `secrets.yaml` (SOPS) → `HOMEPAGE_VAR_*` env vars |

The dashboard definition is split from the host config so it's easy to edit:

- `hosts/homeserver-1/configuration.nix` enables Glances + firewall and imports:
  ```nix
  imports = [
    # ...
    ./homepage.nix
  ];
  ```

## Applying Changes

After editing `homepage.nix`:

```bash
nixos-rebuild switch --target-host petere@homeserver-1 --flake .#homeserver-1 --use-remote-sudo
```

> **Important:** Homepage reads its config files when the service starts. After
> a `nixos-rebuild`, the unit's definition usually changes, but if only the
> *contents* of the config files changed (e.g. just editing `homepage.nix`), the
> service may keep the old config in memory. If your changes don't appear, restart it:
>
> ```bash
> ssh petere@homeserver-1 "sudo systemctl restart homepage-dashboard"
> ```

## Structure of the Dashboard Definition

`hosts/homeserver-1/homepage.nix` has three main parts:

```nix
services.homepage = {
  enable = true;
  port = 8082;
  allowedHosts = [ ... ];       # Host header values Homepage responds to
  environmentFiles = [ ... ];   # SOPS-secret env file with HOMEPAGE_VAR_* keys

  settings = {
    title = "HomeServer";
    # ...
    layout = { ... };           # Controls grouping, tabs, and column widths
  };

  services = [ ... ];           # The service groups and tiles (services.yaml)
  widgets = [ ... ];            # Header info widgets (resources, search, clock)
};
```

## Tabs

Tabs are enabled by adding a `tab` field to a group's **layout** entry.

- Groups with the **same** `tab` value appear on that tab.
- Groups with **no** `tab` appear on **every** tab.
- Tabs are sorted by their order in the `layout` block.
- Each tab is deep-linkable: `#monitoring`, `#homeserver-1`, etc.

Current tabs:

```
Monitoring            (default tab)
├── Homeserver-1 Monitoring   → 5 Glances tiles (localhost)
└── MCF Server Monitoring     → 5 Glances tiles (mcf-server via tailnet)

Homeserver-1  (#homeserver-1)
├── Media     → Jellyfin, Immich
└── System    → Backrest, Pocket ID, Tailscale

MCF Server    (reserved; uncomment the placeholder to enable)
```

## Adding a Service

1. **Add the service tile** to the relevant group in the `services` list:

   ```nix
   services = [
     # ...
     {
       System = [
         # ...existing tiles...
         {
           MyService = {
             icon = "sh-myservice";
             href = "http://homeserver-1.gerbil-opah.ts.net:<port>";
             description = "What it does";
             siteMonitor = "http://127.0.0.1:<port>";   # green/red status
             widget = {                                  # optional live stats
               type = "myservice";
               url = "http://127.0.0.1:<port>";
               key = "{{HOMEPAGE_VAR_MYSERVICE_API_KEY}}"; # only if it needs a key
             };
           };
         }
       ];
     }
   ];
   ```

2. **Set the layout** so the group renders where you want (columns = how many
   tiles per row; groups span the full width with `style = "row"` when they're
   a single top-level group):

   ```nix
   layout = {
     # ...
     MyService = {             # or add to an existing group's entry
       tab = "Homeserver-1";
       style = "row";
       columns = 4;
     };
   };
   ```

3. **API keys**: never hardcode secrets. Add the value to `secrets.yaml` under
   the machine section and reference it via the environment file. The secret
   `homeserver-1/homepage-env` already provides `HOMEPAGE_VAR_JELLYFIN_API_KEY`,
   `HOMEPAGE_VAR_IMMICH_API_KEY`, `HOMEPAGE_VAR_TAILSCALE_API_KEY` and
   `HOMEPAGE_VAR_TAILSCALE_DEVICEID`. To add another:

   ```bash
   sops --set '["homeserver-1"]["homepage-env"] "HOMEPAGE_VAR_MYSERVICE_API_KEY=<value>"' secrets.yaml
   ```

   (This replaces the whole env file — include every existing `HOMEPAGE_VAR_*`
   line when setting it.)

## Adding a Tab

Add a new group to `services` and give it a `tab` in the layout:

```nix
# services
{
  "My New Group" = [
    { "MyService" = { href = "..."; }; }
  ];
}

# layout
"My New Group" = {
  tab = "My Tab";
  style = "row";
  columns = 4;
};
```

## Adding a New Machine to the Dashboard

To monitor another machine (e.g. `richmond-server`):

### 1. Enable Glances on the target machine

Add to that host's `configuration.nix` (Glances exposes system stats to the
dashboard):

```nix
services.glances = {
  enable = true;
  port = 61208;
  extraArgs = [ "--webserver" ];
};

# Expose on Tailscale only
networking.firewall.interfaces.tailscale.allowedTCPPorts = [ 61208 ];
```

### 2. Add the monitoring group

In `hosts/homeserver-1/homepage.nix`, add a group with Glances tiles. **The
group name must be unique** — Homepage's widget proxy resolves widget config by
leaf group name, so duplicate group names cause one machine's stats to display
on another's tiles.

```nix
# services
{
  "Richmond Server Monitoring" = [
    { "System" = { widget = { type = "glances"; url = "http://richmond-server.gerbil-opah.ts.net:61208"; version = 4; metric = "info"; }; }; }
    { "CPU" = { widget = { type = "glances"; url = "http://richmond-server.gerbil-opah.ts.net:61208"; version = 4; metric = "cpu"; }; }; }
    { "Memory" = { widget = { type = "glances"; url = "http://richmond-server.gerbil-opah.ts.net:61208"; version = 4; metric = "memory"; }; }; }
    { "Disk" = { widget = { type = "glances"; url = "http://richmond-server.gerbil-opah.ts.net:61208"; version = 4; metric = "fs:/"; }; }; }
    { "Processes" = { widget = { type = "glances"; url = "http://richmond-server.gerbil-opah.ts.net:61208"; version = 4; metric = "process"; }; }; }
  ];
}

# layout
"Richmond Server Monitoring" = {
  tab = "Monitoring";
  style = "row";
  columns = 5;
};
```

### 3. Add non-monitoring services for that machine

Add a group and give it its own tab (or reuse an existing one):

```nix
# services
{
  "Richmond Server Apps" = [
    { "Ntfy" = { icon = "sh-ntfy"; href = "http://richmond-server.gerbil-opah.ts.net:8080"; }; }
  ];
}

# layout
"Richmond Server Apps" = {
  tab = "Richmond Server";
  style = "row";
  columns = 4;
};
```

### 4. (Optional) Tailscale widget for the machine

Each machine's Tailscale node can be shown with its own widget, using the
machine's numeric device ID (find it via the Tailscale API/admin console):

```nix
{
  "Richmond Server" = [
    {
      Tailscale = {
        icon = "sh-tailscale";
        href = "https://login.tailscale.com/admin/machines";
        widget = {
          type = "tailscale";
          deviceid = "<numeric-device-id>";       # NOT the ...CNTRL value
          key = "{{HOMEPAGE_VAR_TAILSCALE_API_KEY}}";
        };
      };
    }
  ];
}
```

## Troubleshooting

| Symptom | Cause / Fix |
|---------|-------------|
| Changes not appearing | Service not restarted — run `sudo systemctl restart homepage-dashboard` |
| `t.metric is undefined` | Glances widget missing the `metric` field — every glances tile needs `metric` (e.g. `cpu`, `memory`, `fs:/`, `process`, `info`) |
| `no manageable device matching this ID found` | Tailscale widget `deviceid` is wrong — must be the **numeric** device ID, not the `...CNTRL` value |
| Two machines show the same stats | Duplicate group names — every group (especially monitoring) needs a unique name |
| `Host validation failed` | The `Host` header isn't in `allowedHosts` — add the hostname (with port) to `allowedHosts` |
| API keys showing in config | Keys must come from the SOPS env file (`HOMEPAGE_VAR_*`), never hardcoded |

## Glances Metrics

The Glances widget (`type = "glances"`) requires a `version` and `metric`:

- `version = 4` for Glances v4.x (installed)
- `metric`: `info` (system summary), `cpu`, `memory`, `process`, `containers`,
  `fs:/` (disk usage), `network:<iface>`, `sensor:<id>`, `disk:<id>`, `gpu:<id>`