New identity subsystem, and resolves the C2 auth open question: - docs/15-identity-and-access.md + ADR-0014: Keycloak as central IdP; native OIDC where supported (Gitea, Nextcloud, Grafana, Kasm, Semaphore, Headlamp) and oauth2-proxy forward-auth for bare UIs (PiHole, *arr, qBittorrent, Homepage, Prometheus, Alertmanager, Hubble). Group-based authz + MFA; declarative realm/clients (GitOps); PostgreSQL on Longhorn, DR-critical + break-glass; hardened public exposure. Plex/Seerr use Plex auth; Minecraft N/A. - Requirements R-IDP-01..06; ServiceDefinition gains an block. - Onboarded early (with Gitea) so services adopt SSO as they come up. - Threaded through: docs 00,01,07,10,12,13; roadmap phases+workstreams; task board (T-6.1c/T-6.1d); glossary; ADR index; README. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Architecture Decision Records (ADRs)
ADRs are an append-only ledger of the significant technology and pattern choices for this platform. Each records the context, the decision, the rejected alternatives, and the requirements it serves. Do not edit an accepted decision in place — supersede it with a new ADR.
ADRs are specifications and are immutable to AI agents (R-TEST-06). Agents may draft a proposed ADR and escalate it, but only the human operator/architect approves/accepts or edits ADRs. See
../AGENTS.md§3 and §11.
Process (read before proposing a change)
- To change a decision, create a new ADR with the next number and set
Status: Proposed,Supersedes: ADR-XXXX. (Agents draft + escalate; the human approves.) - State what new information invalidates the old decision.
- On approval, set the new ADR
Acceptedand the old oneSuperseded by: ADR-YYYY. - Never silently re-interpret an accepted ADR (see
../AGENTS.md§3).
Template
# ADR-XXXX — <title>
- Status: Proposed | Accepted | Superseded by ADR-YYYY
- Date: <YYYY-MM-DD>
- Serves: <requirement IDs, e.g. R-NET-01, R-NET-06>
- Supersedes: <ADR-ZZZZ or —>
## Context
<forces, constraints, why a decision is needed>
## Decision
<what we chose, stated decisively>
## Alternatives considered
<options and why rejected>
## Consequences
<positive, negative, follow-ups, risks>
Index
| ADR | Title | Status | Serves |
|---|---|---|---|
| 0001 | Kubernetes distribution: k3s | Accepted | R-PLAT-01 |
| 0002 | CNI & network policy & ingress: Cilium + Gateway API | Accepted | R-NET-01..07, R-DNS-01 |
| 0003 | Distributed storage: Longhorn (+ bulk tier, Velero) | Accepted | R-STATE-01..04 |
| 0004 | GitOps engine: Flux CD | Accepted | R-GITOPS-01..03 |
| 0005 | VM workloads: KubeVirt + CDI | Accepted | R-PLAT-03 |
| 0006 | TLS: cert-manager + Let's Encrypt (DNS-01) | Accepted | R-TLS-01..03 |
| 0007 | Secrets: SOPS + age | Accepted | R-SEC-01 |
| 0008 | VPN egress model: Gluetun sidecar + Cilium Egress Gateway | R-NET-05/06 | |
| 0009 | Automated updates: Flux image automation + Renovate | Accepted | R-UPD-01..03 |
| 0010 | Conformance testing: automated, reproducible, behavior-based | Accepted | R-TEST-01..06 |
| 0011 | Conformance test tooling: Kyverno + Chainsaw | Accepted | R-TEST-01..05 |
| 0012 | VPN egress: single shared in-cluster ExpressVPN gateway | R-NET-05/06/07 | |
| 0013 | VPN provider: PIA via Gluetun (WireGuard + port forwarding) | Accepted | R-NET-05/06/07 |
| 0014 | Identity Provider: Keycloak (SSO via OIDC + forward-auth) | Accepted | R-IDP-01..06 |