wiki: Architecture
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Architecture.md
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Architecture.md
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# Atlas OS — System Architecture
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## Overview: The One-Box Philosophy
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Atlas OS is deliberately a single-server architecture. One Hetzner CPX32 VPS
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(8 vCPU · 16 GB RAM · 150 GB NVMe · Nuremberg) runs the complete operational
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infrastructure of Atlas Corporation: CRM, finance, communications, AI, document
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management, fleet control, and 11 websites.
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**Why one box?** For a solo founder, operational simplicity outweighs redundancy.
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One server = one bill, one SSH target, one Caddy config, one Authentik instance,
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and zero inter-datacenter latency. The Tailscale overlay provides device-level
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redundancy for access even if Caddy is down.
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---
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## Network Topology
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```
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┌──────────────────────────────────────────────┐
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Public Internet │ atlas-01 (Hetzner CPX32) │
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───────────── │ ┌─────────┐ ┌──────────┐ │
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Browser/App ──────►│ │ Caddy │───►│Authentik │──► Services │
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│ │ (TLS) │ │ (SSO) │ │
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│ └─────────┘ └──────────┘ │
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│ │
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Tailscale mesh │ ┌────────────────────────────────────────┐ │
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──────────────── │ │ Private tailnet (100.x.x.x) │ │
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iOS / PC / Laptop─►│ │ Webtop desktop · internal dashboards │ │
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│ └────────────────────────────────────────┘ │
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└──────────────────────────────────────────────┘
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```
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### Public → SSO path (every service except mail ports)
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1. Request hits Caddy (443 → Docker port)
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2. Caddy runs `forward_auth` against Authentik outpost
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3. Authentik validates session cookie / issues redirect to login
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4. On success: Caddy copies `X-Authentik-*` headers and proxies to service
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### Tailscale-only services
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- Webtop remote desktop (`tailscale serve :8497`)
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- Internal dashboards (portal, status feeds)
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- atlas-01 SSH (blocked on public firewall, tailnet-only)
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---
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## Service Layers
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### Tier 0 — Identity & Security
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- **Authentik** (`auth.atlascorporation.nl`) — OIDC/SSO, MFA, app proxies
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- **Vaultwarden** (`vault.atlascorporation.nl`) — end-to-end encrypted password vault
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- **Caddy** — automatic TLS, reverse proxy, the sole public entry point
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### Tier 1 — Core Business
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- **Odoo 19** — CRM, invoicing, project management, contacts
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- **Nextcloud 31** — file storage, DAV (calendar/contacts sync to iOS)
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- **Stalwart** — self-hosted email: SMTP, IMAPS, JMAP, Sieve
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- **Forgejo** — self-hosted git (this very repo)
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### Tier 2 — Finance & Operations
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- **Firefly III** — double-entry bookkeeping, budgets, reconciliation
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- **Enable Banking** — PSD2 bank feed (ING, Knab → Firefly)
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- **Paperless-ngx** — document management, OCR, auto-tagging
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- **n8n** — workflow automation (webhooks, scheduled tasks)
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- **Uptime Kuma** — service health monitoring with alerting
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### Tier 3 — AI & Intelligence
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- **LiteLLM proxy** — unified OpenAI-compat API to all models (local + cloud)
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- **Open-WebUI** — ChatGPT-style UI on top of LiteLLM
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- **Atlas Brain** (`atlas_brain.py`) — Python signal collector, runs every 15 min
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- **Atlas Loop** — background nudge cycle, publishes to NATS
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- **Atlas Meridian** — autonomous decision engine / battle responder
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- **Langfuse** — LLM observability: every call traced with latency, cost, tokens
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- **Local model router** (`:8888`) — OpenAI-compat router for local Ollama models
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### Tier 4 — Fleet & Infrastructure
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- **MeshCentral** — remote device access, POS terminal fleet management
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- **NATS** — real-time pub/sub event bus across all Tailscale devices
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- **Atlas heartbeat sink** — aggregates device heartbeats from the NATS mesh
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- **Atlas cockpit feeds** — on-disk JSON feeds consumed by the OS desktop
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- **Webtop** — full XFCE Linux desktop in the browser (tailnet-only)
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### Tier 5 — Managed Sites (11 sites)
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All served via Caddy. WordPress sites run in isolated Docker stacks:
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| Domain | Stack | Notes |
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|--------|-------|-------|
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| `atlasworks.nl` | Docker: works-wordpress | Live WooCommerce (Caddy :8111) |
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| `atlascorporation.nl` | Docker: corp-wordpress | Corporate site |
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| `atlasagency.nl` | Docker: agency-wordpress | Agency services |
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| `atlasacademy.nl` | TransIP nginx (static HTML) | Academy landing |
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| `atlaspos.nl` | TransIP | AtlasPOS product site |
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| `atlashub.nl` | Docker: atlashub | Hub platform |
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| `bicosagency.nl` | Docker: bicos-wordpress | Client site |
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| `budgetenergiecoach.nl` | Docker | Client site |
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| `hkintercare.nl` | Docker: hkincare-wordpress | Client site |
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| `jouwenergieadvies.nl` | Docker | Client site |
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| `reclamemans.nl` | Docker | Client site |
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---
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## Data Flow — Atlas Brain Cycle
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```
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Every 15 minutes (atlas-brain.service):
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┌──────────────────────────────────────────┐
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│ Signal collection phase │
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│ ├── 7 IMAP mailboxes (read-only) │
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│ ├── Odoo REST API (leads, contacts) │
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│ ├── Enable Banking (bank transactions) │
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│ └── atlas-01 health/fleet feeds │
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└──────────────────┬───────────────────────┘
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│
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▼
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atlas-state.json
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│
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▼
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LLM synthesis (model router):
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atlas-auto (local) → Groq 70B → Claude Opus
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│
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▼
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atlas-brief-spoken.json (daily brief)
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│
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▼
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Atlas OS cockpit panels (Today · Money · Inbox · Pipeline)
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```
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---
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## The AI Mesh
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```
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atlas-01 (NATS JetStream server)
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│
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├── subjects:
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│ atlas.events.* system events (disk, CPU, service state)
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│ atlas.heartbeat.* device health pings
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│ atlas.jobs.* delegated compute jobs (Ollama on NEBULA)
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│ atlas.brief.* daily brief push to all devices
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│
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└── subscribers:
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Caddy PC (this machine) ← atlas-events-collector
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NEBULA (HP EliteBook) ← atlas-delegate-worker (5 Ollama models)
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MET-Desktop ← Odoo failover + fleet monitor
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```
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---
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## Caddy SSO Pattern
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Every SSO-gated service uses this Caddyfile block (see `deploy/caddy/Caddyfile.template`):
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```caddy
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app.example.com {
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# Authentik outpost endpoints (must come first)
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reverse_proxy /outpost.goauthentik.io/* authentik-server:9000
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# SSO gate — redirects to login if no valid session
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forward_auth authentik-server:9000 {
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uri /outpost.goauthentik.io/auth/caddy
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copy_headers X-Authentik-Username X-Authentik-Groups X-Authentik-Email
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X-Authentik-Name X-Authentik-Uid X-Authentik-Jwt
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}
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# Only reached after successful authentication
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reverse_proxy localhost:APP_PORT
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}
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```
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---
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## Docker Compose Topology
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| Stack | File | Services |
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|-------|------|----------|
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| Core | `deploy/compose/atlas-core.yml` | Authentik, Nextcloud, Stalwart, Forgejo, Vaultwarden |
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| AI | `deploy/compose/atlas-ai.yml` | LiteLLM, Open-WebUI, Langfuse |
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| Business | `atlas-odoo.yml` | Odoo 19 + PostgreSQL |
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| Finance | `atlas-finance.yml` | Firefly III + Paperless-ngx + Enable Banking |
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| Fleet | `atlas-fleet.yml` | MeshCentral + NATS + Uptime Kuma |
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| Sites | Per-site compose | WordPress stacks |
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| Desktop | `deploy/webtop-docker-compose.yml` | Webtop (tailnet-only) |
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All stacks share the `atlas-net` Docker network. Caddy is the **sole** process with
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public port bindings (80/443). All internal services bind only to `127.0.0.1:PORT`.
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