Guardian

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Ultra-lightweight self-hosted server & Docker dashboard + app launcher (<35MB RAM, zero DB)

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- - docker-publish.yml
- settings.json
- - App.tsx
  - index.css
  - main.tsx
- index.html
- package-lock.json
- package.json
- postcss.config.js
- tailwind.config.js
- tsconfig.json
- tsconfig.node.json
- vite.config.ts
- - 01-dashboard-overview.png
  - 02-app-launcher.png
  - 03-metric-telemetry.png
  - 04-process-monitor.png
  - 05-endpoint-health.png
- - alerts.ts
  - disktrend.ts
  - history.ts
  - index.ts
  - logger.ts
  - power.ts
  - prober.ts
  - problems.ts
  - ringbuffer.ts
  - speedtest.ts
  - store.ts
  - types.ts
- package-lock.json
- package.json
- tsconfig.json
.dockerignore
.gitignore
AGENTS.md
docker-compose.yml
docker-compose.yml.example
Dockerfile
package-lock.json
package.json
README.md

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// repository documentation

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**A self-hosted dashboard for a Docker homelab — server telemetry, container health, and an app launcher in one page.**

[🌐 **Live Website & Quick Install Guide**](https://vineetkishore01.github.io/Guardian/) · [📦 **GHCR Container Package**](https://github.com/vineetkishore01/Guardian/pkgs/container/guardian)

Guardian reads your machine directly: `/proc` and `/sys` for host metrics, the Docker socket for containers. No agent, no database, no cloud. It runs in about 40 MB of RAM and pushes updates over Server-Sent Events rather than polling.

---

## Contents

- [Showcase](#showcase)
- [What it does](#what-it-does)
- [How it works](#how-it-works)
- [Quick start](#quick-start)
- [Environment variables](#environment-variables)
- [Enabling shutdown and reboot](#enabling-shutdown-and-reboot)
- [Runtime settings](#runtime-settings)
- [API reference](#api-reference)
- [Local development](#local-development)
- [Design notes](#design-notes)
- [Project layout](#project-layout)

---

## Showcase

| Dashboard & Host Telemetry | App Launcher & In-Tile Widgets |
|:---:|:---:|
| [![Dashboard Overview](https://raw.githubusercontent.com/vineetkishore01/Guardian/main/docs/screenshots/01-dashboard-overview.png)](docs/screenshots/01-dashboard-overview.png) | [![App Launcher](https://raw.githubusercontent.com/vineetkishore01/Guardian/main/docs/screenshots/02-app-launcher.png)](docs/screenshots/02-app-launcher.png) |
| *Real-time telemetry, Intel GPU stats, power, and storage gauges* | *App launcher with live in-tile widgets (Jellyfin, Bazarr, etc.)* |

| Historical Metrics & Interactive Analytics | Host & Container Process Monitor |
|:---:|:---:|
| [![Historical Metrics](https://raw.githubusercontent.com/vineetkishore01/Guardian/main/docs/screenshots/03-metric-telemetry.png)](docs/screenshots/03-metric-telemetry.png) | [![Process Monitor](https://raw.githubusercontent.com/vineetkishore01/Guardian/main/docs/screenshots/04-process-monitor.png)](docs/screenshots/04-process-monitor.png) |
| *Interactive 24-hour charts, min/avg/peak stats, and process consumers* | *Live process explorer sorting CPU, memory, and network usage* |

Endpoint Health Prober 
 <a href="docs/screenshots/05-endpoint-health.png"><img src="docs/screenshots/05-endpoint-health.png" alt="Endpoint Health Prober" width="100%" /></a>
 
 Automated HTTP health checks across container ports with latency and status codes

---

## What it does

### Host telemetry

| Signal | Read from | Notes |
| --- | --- | --- |
| CPU utilisation | `/proc/stat` | Total plus **per-core**, drawn as a strip so one pegged thread is visible inside a calm average |
| I/O wait | `/proc/stat` | Reported separately from utilisation — a disk-bound host can sit at 3% CPU while everything stalls |
| Load average | `/proc/loadavg` | Shown as a percentage of thread count, because "2.35" means nothing on its own |
| Memory & swap | `/proc/meminfo` | Used, available, buffers/cache, swap |
| Temperature | `/sys/class/hwmon`, `/sys/class/thermal` | hwmon first — that's where `coretemp` package readings live |
| Network | `/proc/net/dev` | Per-interface throughput; virtual and overlay interfaces are excluded from "primary link" |
| Storage | `/proc/mounts` + `statfs` | Every real filesystem with its true device and fs type |

Each metric tile opens a **history page**: full-size charts with 1H / 6H / 24H / 7D / 30D ranges, current / average / peak / minimum, and a table view.

### Container monitoring

Guardian calls both `/containers/json` *and* `/containers/{id}/json`, because the first one alone will happily report a crash-looping container as "running":

- **Restart counts, exit codes, OOM kills** and the daemon's own error string
- **Healthcheck logs** — the last few probe results with their output, so "unhealthy" comes with a reason
- **Live CPU and memory** over a persistent stats stream, so values are ~1 second old rather than up to 30
- **Shared network namespaces** resolved by name (a container on `network_mode: container:gluetun` says *via gluetun*)
- **Container logs** with stdout and stderr separated, filtering, follow mode, and adjustable tail

Anything needing attention is sorted to the front of the grid, and a summary line says either how many containers have a problem or that everything is healthy.

### Endpoint health

An HTTP prober checks every container's published port on a 60-second cycle, reporting latency and distinguishing `2xx`, redirects, `401`/`403`, client errors and server errors. **Targets are derived from what is actually running** — plus any port your bookmarks point at, which covers host services that aren't containers.

### App launcher

Auto-discovers containers and turns them into clickable tiles. Custom icons (60+ presets or any image URL), custom launch URLs with `{host}` / `{lan}` / `{tailscale}` placeholders, categories, search (`/` to focus), pinning, and bookmarks for anything outside Docker.

### Housekeeping

- **Docker reclaimable space** with one-click prune of dangling images only
- **Application logs** — Guardian's own structured log, filterable by level and scope, persisted across restarts
- **Shutdown / reboot**, off by default and heavily gated ([details below](#enabling-shutdown-and-reboot))

> **Running off-host?** Without `/proc`, `/sys` or a Docker socket, Guardian serves clearly-labelled sample data and names the source it couldn't reach. It never presents synthesized values as real measurements.

---

## How it works

```
┌──────────── browser ────────────┐
│  React SPA · SSE · hash routes  │
└───────────────┬─────────────────┘
                │  /api/live (SSE, heartbeated)
┌───────────────▼─────────────────┐
│         Express server          │
│                                 │
│  one sampling loop  ──────────► snapshot ──► every reader
│      │                                                   │
│      ├─ /proc, /sys        (host telemetry)              │
│      ├─ docker.sock        (containers, stats streams)   │
│      ├─ HTTP prober        (endpoint health)             │
│      └─ tiered history     (30 days, on disk)            │
└─────────────────────────────────┘
```

**One sampler, many readers.** The CPU and network collectors diff kernel counters, so calling them twice in quick succession makes the second read report near-zero. A single loop samples on a fixed cadence and publishes an immutable snapshot; `/api/status` and every SSE client serve that snapshot rather than re-sampling.

**Tiered history.** A month of 15-second samples would be ~180,000 points per metric. Guardian keeps every sample for 6 hours, 5-minute averages for 7 days, and hourly averages for 30 days — about 3,600 points total, which fits in memory, serialises to a small JSON file, and survives restarts.

**Streaming container stats.** One long-lived connection per running container instead of a request per container per poll. Connection count stays flat as the poll rate changes.

---

## Quick start

### Docker Compose

Grab `docker-compose.yml.example` directly or paste the compose configuration below:

```bash
# Download and start in one step
curl -sSL https://raw.githubusercontent.com/vineetkishore01/Guardian/main/docker-compose.yml.example -o docker-compose.yml
docker compose up -d
```

Or create `docker-compose.yml` manually:

```yaml
services:
  guardian:
    image: ghcr.io/vineetkishore01/guardian:latest
    container_name: guardian
    restart: unless-stopped
    ports:
      - "3001:3001"
    volumes:
      # Container discovery, stats and logs (/var/run/docker.sock for rw actions)
      - /var/run/docker.sock:/var/run/docker.sock
      # Host telemetry
      - /proc:/host/proc:ro
      - /sys:/host/sys:ro
      - /etc/os-release:/host/etc/os-release:ro
      - /etc/hostname:/host/etc/hostname:ro
      # Storage — mount root (rslave allows submounts like /mnt or /media to resolve)
      - /:/host/root:ro,rslave
      # Persisted icons, bookmarks, history and logs
      - guardian_data:/data
    environment:
      - HOST_PROC=/host/proc
      - HOST_SYS=/host/sys
      - HOST_ETC=/host/etc
      - HOST_ROOT=/host/root
      - PORT=3001
      - NODE_ENV=production
    deploy:
      resources:
        limits:
          memory: 128M
          cpus: '0.50'

volumes:
  guardian_data:
```

Then open `http://<your-server>:3001`.

### Build from source

```bash
git clone https://github.com/vineetkishore01/Guardian.git
cd Guardian
docker compose up -d --build
```

---

## Environment variables

Everything is optional — Guardian starts with no configuration and discovers what it can.

### Networking

| Variable | Default | Description |
| --- | --- | --- |
| `PORT` | `3001` | Port the HTTP server listens on. |
| `BIND_HOST` | `0.0.0.0` | Address to bind. Set to `127.0.0.1` to accept only local connections, e.g. behind a reverse proxy. |

### Host telemetry paths

Inside a container the host's filesystems are bind-mounted elsewhere, so each collector's root is configurable. Values must match the container-side path you mounted to.

| Variable | Default | Description |
| --- | --- | --- |
| `HOST_PROC` | `/proc` | procfs mount point. Source of CPU, memory, load, uptime, network and mount data. Without it, host metrics fall back to sample values. |
| `HOST_SYS` | `/sys` | sysfs mount point. Source of temperatures (`hwmon` and `thermal`). |
| `HOST_ETC` | `/etc` | Used to read `os-release` for the distro name. Without it Guardian reports the kernel name instead of e.g. "Debian GNU/Linux 13". |
| `HOST_ROOT` | `/` | The root filesystem to measure. Set to `/host/root` when you bind-mount `/` elsewhere. |
| `HOST_NAS` | `/mnt/nas` | An additional volume to measure. Despite the name it can be any path. |
| `HOST_MOUNTS` | *(empty)* | Comma-separated extra mount points to watch, e.g. `/host/mnt/backup,/host/srv`. Filesystems found in `/proc/mounts` are picked up automatically; use this for anything that isn't. |

### Docker

| Variable | Default | Description |
| --- | --- | --- |
| `DOCKER_SOCKET` | `/var/run/docker.sock` | Path to the Docker daemon socket. Read-only access is enough for everything except pruning. Without it, Guardian shows a labelled sample container list. |

### Storage and persistence

| Variable | Default | Description |
| --- | --- | --- |
| `DATA_DIR` | `/data` | Where `guardian.json` (icons, bookmarks, settings), `history.json` (30-day metrics) and `logs.json` are written. Falls back to `./data` when the directory does not exist, which is what happens during local development. |

### Launch targets

These only seed the initial values; both are editable in **Settings** afterwards and stored in `guardian.json`.

| Variable | Default | Description |
| --- | --- | --- |
| `SERVER_IP` | *(empty)* | LAN address used to build app URLs when the launch target is set to **LAN**. Left empty, the LAN option is not offered. |
| `TAILSCALE_IP` | *(empty)* | Tailscale address, used when the launch target is set to **Tailscale**. Left empty, the option is not offered. |

### Logging

| Variable | Default | Description |
| --- | --- | --- |
| `LOG_LEVEL` | `info` | Minimum level recorded: `debug`, `info`, `warn` or `error`. Entries appear in the dashboard's log panel and on stdout, so `docker logs guardian` keeps working. |

### Power control

| Variable | Default | Description |
| --- | --- | --- |
| `ENABLE_POWER_CONTROLS` | `false` | Set to the exact string `true` to allow shutdown and reboot. While unset the control is hidden entirely — not shown disabled. |
| `GUARDIAN_POWER_COMMAND` | *(auto-detect)* | Custom command to run, with `{action}` expanded to `poweroff` or `reboot`. Split on whitespace and executed as an argument array — never through a shell. Auto-detection tries `systemctl`, then `shutdown`. |

---

## Enabling shutdown and reboot

This is the only endpoint that can take the machine down, so it is deliberately hard to trigger by accident:

1. It does nothing unless `ENABLE_POWER_CONTROLS=true`.
2. The caller must type the machine's **hostname** to confirm.
3. Every attempt, including refusals, is written to the application log.

```yaml
environment:
  - ENABLE_POWER_CONTROLS=true
```

### The container caveat

Guardian runs in a container, so `systemctl poweroff` acts on **the container**, not the host — you'd get a button that restarts Guardian. The dialog warns you when it detects this. To reach the host, supply a command that crosses the boundary:

```yaml
volumes:
  - /path/to/key:/keys/guardian:ro
environment:
  - ENABLE_POWER_CONTROLS=true
  - GUARDIAN_POWER_COMMAND=/usr/bin/ssh -i /keys/guardian -o StrictHostKeyChecking=yes admin@host sudo systemctl {action}
```

Restrict the key in the host's `authorized_keys` so it can only run those two commands:

```
command="/usr/bin/sudo /bin/systemctl $SSH_ORIGINAL_COMMAND",no-port-forwarding,no-pty ssh-ed25519 AAAA...
```

Alternatives are `pid: host` plus `nsenter`, or mounting the systemd D-Bus socket. Both grant the container substantially more power over the host than a scoped SSH key.

> ⚠️ **Guardian has no authentication.** Anyone who can reach the port can read everything and, with power controls on, shut the machine down. Keep it on a trusted network or behind an authenticating reverse proxy.

---

## Runtime settings

Editable in the UI, stored in `guardian.json`, no restart required:

| Setting | Effect |
| --- | --- |
| **App launch target** | Whether tile URLs are built from the browser's address, the LAN IP, the Tailscale IP, or a custom domain. |
| **LAN / Tailscale address** | The addresses those options use. Also seeds the `{lan}` and `{tailscale}` placeholders. |
| **Dashboard title** | Shown in the browser tab. |
| **Telemetry interval** | 5–300 seconds. Applied immediately — the sampling loop re-arms without a restart. |
| **Backup** | Exports icons, categories and bookmarks as JSON. |

---

## API reference

| Method | Route | Purpose |
| --- | --- | --- |
| `GET` | `/api/health` | Liveness, SSE client count, open stats streams, last sample time |
| `GET` | `/api/status` | Current telemetry snapshot |
| `GET` | `/api/live` | SSE stream of snapshots, with heartbeats |
| `GET` | `/api/history/:metric` | One metric's history — `?range=1h\|6h\|24h\|7d\|30d` |
| `GET` | `/api/history` | Several at once — `?metrics=cpu,ram&range=24h` |
| `GET` | `/api/logs` | Application log — `?level=&scope=&limit=` |
| `DELETE` | `/api/logs` | Clear the log buffer |
| `GET` | `/api/containers/:id/logs` | Container logs — `?tail=200` |
| `GET` | `/api/config` | Full persisted config, for backup |
| `POST` | `/api/config/settings` | Update settings |
| `POST` | `/api/containers/:name/custom` | Per-container icon, URL, category, pin, hide |
| `POST` | `/api/custom-apps` | Create or update a bookmark |
| `DELETE` | `/api/custom-apps/:id` | Delete a bookmark |
| `POST` | `/api/docker/prune` | Prune dangling images |
| `POST` | `/api/probes/refresh` | Force a health-probe cycle |
| `GET` | `/api/power` | Whether power control is available, and why not if it isn't |
| `POST` | `/api/power/:action` | `shutdown` or `reboot`, body `{ "confirmation": "<hostname>" }` |

Metric keys: `cpu`, `ram`, `swap`, `temp`, `netRx`, `netTx`, `disk`.

---

## Local development

```bash
# Install
npm install && (cd client && npm install) && (cd server && npm install)

# Client on :5173 with hot reload, server on :3001
npm run dev

# Or build and serve the production bundle from the server
npm run build && npm start
```

On a non-Linux machine the host and Docker collectors fall back to sample data and the dashboard says so — the UI is fully developable without a Linux host.

To exercise the Docker code paths without a daemon, point `DOCKER_SOCKET` at any process speaking the Engine API subset Guardian uses (`/containers/json`, `/containers/{id}/json`, `/containers/{id}/stats`, `/containers/{id}/logs`, `/system/df`).

---

## Design notes

A single neutral ramp carries the interface, one brand hue marks anything interactive, and three status hues are reserved for state. **Colour always encodes meaning**: a metric turns amber or red because it crossed a threshold, never for decoration. A healthy dashboard is almost entirely monochrome, so anything coloured is worth looking at.

The dark theme is **AMOLED true black** — the page plane is `#000`, where an OLED panel switches the pixel off. Since shadows are invisible on black, elevation comes from brighter borders and a lit top edge instead.

Chart series use a four-slot categorical palette assigned in fixed order and validated in both themes against the real surfaces for lightness band, chroma floor, colour-vision separation and contrast. Charts start the y-axis at zero, break the line across data gaps rather than interpolating across them, and offer a table view so nothing depends on colour alone.

---

## Project layout

```
Guardian/
├── Dockerfile                    Multi-stage production image
├── docker-compose.yml            Local development deployment
├── docker-compose.yml.example    Standalone production template (GHCR image)
├── server/                       Node · TypeScript · Express
│   └── src/
│       ├── collectors/
│       │   ├── host.ts           /proc & /sys — CPU, memory, temps, network
│       │   ├── disk.ts           Filesystem discovery via /proc/mounts
│       │   └── docker.ts         Socket client, stats streams, log demux
│       ├── prober.ts             HTTP health checks on discovered ports
│       ├── history.ts            Tiered 30-day metric store
│       ├── logger.ts             Structured application log
│       ├── power.ts              Guarded shutdown / reboot
│       ├── store.ts              Persistence + payload validation
│       └── index.ts              Sampling loop, SSE, API routes
└── client/                       React 18 · Vite · Tailwind
    └── src/
        ├── components/
        │   ├── ui/               Card, Button, Dialog, Input, Badge, Progress, Tabs
        │   ├── layout/           Header, PowerMenu, SettingsModal, PruneBanner
        │   ├── metrics/          MetricCard, CoreStrip, HostStatsBar, StorageGauges
        │   ├── apps/             AppGrid, AppCard, Add/Edit modals
        │   ├── logs/             LogsPanel, ContainerLogsModal
        │   ├── services/         ServicesTable
        │   └── charts/           LiveSparkline, TimeSeriesChart
        ├── pages/                MetricDetailPage
        ├── hooks/                useLiveTelemetry
        └── lib/                  formatters, severity, router, metrics, icons
```

---

## Licence

MIT

Guardian

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