thesabear
20f39f3b6d
Completes the docs/ set - all 16 systems now have a full deep-dive page in the diagram+callout+table style. Architecture overview covers the 4 trust boundaries and 2 traffic planes; IaC pipeline is a fresh Packer->Terraform->Ansible writeup replacing the stale old-content/ snapshot; disaster recovery covers the 3 independent backup layers and the deliberately decoupled OS/app upgrade systems.
83 lines
3.8 KiB
Markdown
83 lines
3.8 KiB
Markdown
# 📐 Architecture Overview
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> [!NOTE]
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> The stable, directional laws governing how traffic moves through the fleet — re-verified against live infrastructure, not assumed from older documentation. Two real corrections were caught and fixed the last time this was checked, which is exactly the point of re-verifying rather than trusting a prior write-up forever.
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## Dependency graph
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```mermaid
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flowchart TD
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Internet(["Internet"]) --> Edge["Edge Firewall<br/>NAT · public reverse proxy · NTP · DHCP"]
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Edge --> LAN["LAN"]
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LAN --> DNS["Internal DNS"]
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LAN --> Vault["Vault"]
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DNS --> Vault
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Vault --> Apps["App Host<br/>~40 stacks"]
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LAN --> FileServer["File Server"]
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DNS --> FileServer
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Vault --> Automation["Automation Host"]
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LAN --> Automation
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Apps --> InternalProxy["Internal reverse-proxy zone"]
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Apps --> SSO["SSO"]
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Automation --> Gitea["Git hosting<br/>internal + public mirror"]
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Vault --> EdgeProxy["User-facing reverse proxy<br/>mTLS"]
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DNS --> EdgeProxy
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Apps -.proxied by.-> EdgeProxy
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SSO -.auth gate via.-> EdgeProxy
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Apps -.reports to.-> Monitoring["Monitoring"]
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Automation -.reports to.-> Monitoring
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FileServer -.reports to.-> Monitoring
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EdgeProxy -.reports to.-> Monitoring
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Vault -.reports to.-> Monitoring
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DNS -.reports to.-> Monitoring
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Apps -.reports to.-> Wazuh["Security Monitoring"]
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Automation -.reports to.-> Wazuh
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FileServer -.reports to.-> Wazuh
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EdgeProxy -.reports to.-> Wazuh
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Vault -.reports to.-> Wazuh
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DNS -.reports to.-> Wazuh
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```
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## Four trust boundaries, not two
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```mermaid
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flowchart LR
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WAN["WAN"] -->|public application boundary| EdgeFW["Edge Firewall / public proxy"]
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Browser["LAN browsers"] -->|mTLS + SSO| UserProxy["User-facing proxy"]
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Service["App-to-app"] -->|IP-allowlist + SSO| InternalProxy["Internal proxy"]
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Infra["LAN infra-to-infra"] -->|explicit per-flow rules| HostFW["Host firewall rules"]
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```
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Backend services trust proxy headers, not raw client IP, on every path.
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## Two structurally independent traffic planes
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| Plane | Path |
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| **Ingress — public** | Client → edge firewall/proxy → backend |
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| **Ingress — LAN-facing** | Client → user-facing proxy (mTLS) → backend |
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| **East-west — app-to-app** | Service → internal proxy zone → service |
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| **East-west — infra-to-infra** | Service → firewall rule → service, direct, no proxy |
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> [!IMPORTANT]
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> **Observability sits outside every request path on purpose.** Logs and metrics push asynchronously to monitoring infrastructure; nothing in that pipeline is inline with application traffic, and application services don't depend on monitoring availability. If monitoring goes down, collection stops — nothing else does.
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## Caught by re-verification, not assumed
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> [!WARNING]
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> The last full re-check against live infrastructure found two real corrections to what was previously documented: the public reverse-proxy layer had actually moved from running as its own dedicated VM to running as a package directly on the edge firewall — and an older "flat mesh network, no mutual TLS" model for internal service traffic had been fully replaced by the two-zone split described in [`docs/dns-naming.md`](dns-naming.md), without the architecture documentation being updated to match at the time. Both were caught by running real commands against the live fleet, not by re-reading the previous version and assuming it still held.
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## What this map deliberately excludes
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Not a firewall rule listing, not a port inventory, not a service configuration reference — those live in their own docs ([`docs/firewall-and-network.md`](firewall-and-network.md) and elsewhere). This is strictly the stable, directional shape of how trust and traffic actually move.
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---
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Related: [`docs/firewall-and-network.md`](firewall-and-network.md), [`docs/dns-naming.md`](dns-naming.md)
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