jakman85andClaude Opus 5
fd43f332d6
platform/coredns/coredns-custom.yaml has always said its split-horizon is for
PODS and deferred LAN clients to "PiHole split-horizon". PiHole served no DNS:
its Service was ClusterIP with ports 80 and 4180 only. The LAN half of R-DNS-03
that docs/09 and the README's Phase 2 row both claim did not exist, so LAN
clients ran on hand-maintained per-client dnsmasq files - one went stale after
the dev decommission and cost the operator sonarr.home.keithjackson.dev. The
SOHO router that owns 192.168.2.0/24 cannot cover for it either: it strips
RFC1918 answers for public domains as rebind protection and returns NOERROR
with no answer.
EXPOSURE (apps/wave-0/pihole-dns.yaml, hand-written, placed into wave 0 by
render.py's EXTRA_UNITS - the schema has no field for a LoadBalancer Service, a
pinned lbipam VIP, a sharing key, source ranges or UDP, the same reason
apps/vms/unifi and platform/crafty hand-write theirs):
- two Services, udp/53 and tcp/53, sharing one pinned VIP
${PIHOLE_DNS_VIP} = 192.168.2.23 on prod, the next free address in the
.20-.30 pool (pool status IPsUsed 3 of 11; .20 Gateway, .21 unifi, .22
crafty; arping from a LAN host got no reply).
- no external-dns hostname annotation: nothing public is created, and
platform/externaldns/ is untouched.
ANSWERS (catalog/pihole.yaml env - declarative, no reconciler): PiHole v6 takes
every FTL setting as an FTLCONF_ environment variable and treats it as
env-forced, applied ahead of pihole.toml on every cold start and read-only in
the UI. That is a real declarative entry point, which the Keycloak and CNPG
CronJob reconcilers exist precisely because their state lacks, so a reconciler
here would be ceremony. misc.dnsmasq_lines carries a wildcard
address=/<zone>/<GATEWAY_VIP> plus one longer-domain override per L4 service
(unifi, crafty-mc, pihole-dns); dnsmasq resolves overlaps by longest matching
domain, so precedence is structural and a newly onboarded Gateway-fronted
service needs no DNS change. dns.upstreams is declared too - the live pod
carried hand-set upstreams that no manifest knew about and that every restart
discarded.
externalTrafficPolicy Cluster, NOT Local, and loadBalancerSourceRanges for the
LAN restriction. Measured on prod, Cilium 1.20.1: the L2 announcer does not
filter lease candidates by which nodes hold a backend - the two Services landed
on k3s-prod-3 and k3s-prod-2 while the pod ran on k3s-prod-1 - and it keeps
renewing after the pod moves away, so with Local a reschedule leaves LAN DNS
dead indefinitely. Cluster serves the VIP from any node; the LAN restriction
moves to loadBalancerSourceRanges, which Cilium enforces in eBPF on the VIP
before load-balancing (verified by narrowing the range to exclude the test
client and back). The cost is SNAT: forwarded queries reach PiHole from the
ingress node, so PiHole's per-client rate limit is disabled in the catalog or
the whole LAN would count as one client against its 1000-per-60s default.
Proven from a LAN host (192.168.2.132) against 192.168.2.23 with the pod and
both leases on three DIFFERENT nodes: sonarr/grafana/nextcloud/keycloak/apex
-> 192.168.2.20, unifi -> .21, crafty-mc -> .22, pihole-dns -> .23, recursion
(cloudflare.com, github.com, debian.org) intact over both udp and tcp, AAAA
NODATA, NXDOMAIN outside the zone, and still answering after a forced
prod-1 -> prod-2 reschedule.
Co-Authored-By: Claude Opus 5 <[email protected]>
112 lines
8.0 KiB
Markdown
112 lines
8.0 KiB
Markdown
# home-network-k3s-impl
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Implementation of the home k3s + Longhorn platform. This repo holds the **reconciled artifacts**
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(Flux config, Kustomize overlays, KubeVirt/Helm manifests, ServiceDefinitions, Kyverno policies,
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Chainsaw conformance tests, CI). It is driven by — and subordinate to — the **read-only
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specification** at [`../home-network-k3s`](../home-network-k3s).
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## Rules (from the spec — non-negotiable)
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- **The spec is read-only.** Never modify anything under `../home-network-k3s`. Implement against it;
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escalate spec problems, don't edit them (spec `AGENTS.md` §11, R-TEST-06).
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- **Done = a green, reproducible, requirement-tagged conformance test** — never "merged," never a
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manual demo (spec `docs/14`, `agents/definition-of-done.md`).
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- **No work on `main`.** Every change is a feature branch merged into `main` (spec `CONTRIBUTING.md`).
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- **No plaintext secrets** — SOPS-encrypted only (spec `docs/07`).
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- **Phase discipline** — only build what the active roadmap phase authorizes (spec `roadmap/phases.md`).
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## Layout
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```
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infra/ node provisioning: OpenTofu (Proxmox VE) + cloud-init + Ansible, and the
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pinned dev container that carries the whole toolchain
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bootstrap/ one-time cluster bootstrap: Flux install, SOPS/age key, host Gitea
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platform/ platform CONTROLLERS (Flux HelmReleases / operator bases): kyverno, cilium,
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longhorn, external-snapshotter, cert-manager, externaldns, gateway, coredns,
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vpn-egress, monitoring, cnpg, keycloak, oauth2-proxy, kubevirt
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platform-config/ platform CONFIGS — the custom resources of the CRDs installed above
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(ClusterIssuers, Gateway, Kyverno policies, KubeVirt/CDI CRs, Keycloak CRs).
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Split out because CRs and the CRDs they use cannot apply in one pass.
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apps/ application tier, reconciled as dependency-ordered WAVES:
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wave-0/ wave-1/ wave-2/ rendered container apps (see DESIGN-waves.md)
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vms/ KubeVirt VirtualMachines (non-gating tier)
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catalog/ ServiceDefinition entries (the onboarding surface) + render.py
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schemas/ ServiceDefinition JSON Schema + renderer contract
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clusters/ Flux entrypoints + dev/ and prod/ overlays
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conformance/ Chainsaw behavior/conformance suite + harness + coverage report
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ci/ the gate as scripts (lint · schema · Kyverno L0 · L1 render · decision)
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.gitea/ Gitea Actions CI running that gate on an in-cluster runner
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```
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## Status
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Roadmap phases **0–6 are delivered**, and **Phase 7 (Production Readiness) is OPEN and in
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progress**. `clusters/prod` is no longer a design-only overlay: prod is the live cluster, serving the
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apex `home.keithjackson.dev`. The dev cluster was **decommissioned on 2026-09-12** (full migration:
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dev out, prod onto the apex — see the DECISIONS-LOG), so phases 0–6 are now exercised on prod
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hardware rather than on Proxmox VMs.
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**Phase 7 exit criteria** — *prod runs the same config via the prod overlay; DR proven; monitoring +
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alerts live*:
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| criterion | state |
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|---|---|
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| prod runs the prod overlay | **met** — 3× mini-PC bare metal, one Flux tree, prod overlay only |
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| monitoring + alerts live | **met 2026-09-13** — see the note below; this was not true before that date |
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| **DR proven** | **R-STATE-03 PROVEN on prod 2026-09-14** — off-cluster restore from Cloudflare R2. `R-STATE-02` (node-loss) is still dev-only |
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**DR restore is proven on prod.** `R-STATE-03` reads `proven` in `--status` as of 2026-09-14 —
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the first requirement in this repo to reach that state. Both of its verifiers are recorded:
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`dr-restore` (L3, run `20260914T021505Z-24b8111`, sentinel `DR_RESTORED_FROM_OFF_CLUSTER_BACKUP_OK`)
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and `placeholder-guard-coupling` (L0). The L3 drill seeds a canary on the replicated `longhorn`
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class, backs the namespace and volume data up off-cluster, **destroys every in-cluster copy**
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(namespace, PVC and PV), restores into a clean namespace, and asserts the restored PVC binds a
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*different* PersistentVolume — so an in-cluster survival cannot pass as a restore.
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**What remains for Phase 7:** `R-STATE-02` (`node-loss`) is still proven only on the decommissioned
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dev cluster. That drill takes a real node down on a live cluster, so it is a deliberate, scheduled
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exercise rather than something to run in passing.
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Read `--coverage-only` and `--status` as two different questions; the earlier `PROVEN: 0` was not a
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bug but the honest answer, because proofs are claims about a specific tree on a specific cluster.
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| Phase | Delivered |
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| 0 Foundations | ServiceDefinition schema + renderer, Kyverno L0 gate, conformance harness, CI |
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| 1 Cluster bring-up | 3-node k3s HA, embedded etcd, kube-vip VIP, Cilium, Flux, SOPS. Originally Proxmox VMs; **now 3× mini-PC bare metal** (`k3s-prod-1/2/3`, `192.168.2.10/.11/.12`, k3s v1.36.4+k3s1, Debian 13) |
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| 2 Platform core | Cilium · Longhorn · cert-manager (LE-prod wildcard) · ExternalDNS · Gateway API · split-horizon DNS, **both halves**: CoreDNS for pods, and **PiHole as the authoritative LAN resolver** for `${BASE_DOMAIN}` on udp/53 + tcp/53 at a pinned VIP (`192.168.2.23` on prod). The LAN half was claimed from the start but did not exist until 2026-09-14 — PiHole's Service was ClusterIP :80/:4180, so LAN clients ran on hand-maintained per-client `dnsmasq` files |
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| 3 Egress / VPN | ADR-0015 node-level OpenVPN split-tunnel + Cilium egress-gateway steering + host kill-switch |
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| 4 Observability | kube-prometheus-stack · Loki · Alloy · Alertmanager. **Velero unblocked 2026-09-13** — backs up to Cloudflare R2 (OQ-BKP closed; the `velero-plugin-for-aws` tagging incompatibility needed a pinned plugin). Longhorn has **no** backup target by decision: volume data is protected by Velero + kopia to R2. image-automation authored but disabled |
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| 5 IaaS | KubeVirt + CDI on real nested KVM; live-migratable RWX VM storage. The UniFi VM runs, but **UniFi OS Server is not yet installed in the guest** |
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| 6 Identity + CI | Keycloak (Operator + CNPG) · oauth2-proxy forward-auth · Grafana OIDC · **kubectl OIDC SSO with group→RBAC** · in-cluster Gitea Actions merge gate |
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| **7 Production readiness** | **IN PROGRESS** (DR restore proven 2026-09-14; node-loss outstanding). Prod live on bare metal serving the apex; dev decommissioned; CNPG HA 3 instances with primaries spread one per node; NFS bulk media + legacy Nextcloud mounted; VPN egress on prod. Alerting made real 2026-09-13 (Longhorn, cert-manager, Flux and twelve app SLIs had all been unable to fire). **Open: `node-loss` (R-STATE-02) re-proven on prod.** |
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**Conformance: 51 / 51 requirements covered (100%)**, 0 gaps, 0 safety-critical gaps (closed
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2026-09-13; `R-C2-01`/`R-C2-02` were the last two). Regenerate with
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`./conformance/run.sh --coverage-only`; the full report is
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`conformance/_artifacts/coverage/coverage.md`.
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Coverage is **not** proof. A requirement is *covered* when an executable test exists for it, and
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*PROVEN* only when a recorded run of that test is in `conformance/runs/ledger.jsonl` at the current
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SHA on the cluster it claims. Read both numbers: `--coverage-only` for the first, `--status` for the
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second.
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The running narrative — decisions, root causes, incidents, follow-ups — is
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[`DECISIONS-LOG.md`](DECISIONS-LOG.md). It, not this table, is the authoritative record.
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## Working on this repo
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Everything the gate needs is baked into the pinned dev container — **do not install the
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toolchain on the host**:
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```bash
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infra/devcontainer/dev.sh build # once
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infra/devcontainer/dev.sh run make -C ci gate # the same gate CI runs
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infra/devcontainer/dev.sh # interactive shell (sops, flux, kubectl, tofu, ansible)
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```
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The container mounts the repo at `/work`, your age keyring, and the sibling spec repo read-only
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so the spec-immutability check can actually run. See
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[`infra/devcontainer/README.md`](infra/devcontainer/README.md).
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A green run prints `MERGE GATE: PASS`. The L2/L3 conformance layers stay `SKIPPED` unless
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`CLUSTER_AVAILABLE=true` — the static gate never pretends to have run them.
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