Wiring the port via "${PIA_OPENVPN_PORT}" made Flux/kustomize emit an unquoted
53 (int) after substitution, which k8s rejects for an env value ("expected
string, got 53"). Same gotcha as the Longhorn numberOfReplicas fix. Hardcode the
quoted string; cluster-var removed with a NOTE explaining why.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
clusters/
Flux entrypoints and the environment-overlay model (R-ENV-02, R-GITOPS-01/02/03).
Governing spec: docs/05-gitops-and-delivery.md,
docs/02-environments-and-provisioning.md,
ADR-0004 (Flux).
Phase 0 scaffolding only. These are structurally-correct stubs. No cluster exists — nothing here reconciles until WS-INFRA delivers a cluster and bootstraps Flux (roadmap Phase 1).
Layout — base + overlay (never fork the base)
clusters/
base/ shared Flux objects (one authoring, both environments)
flux-system.yaml GitRepository — the reconciliation source (bootstrap → Gitea)
platform.yaml Flux Kustomization → ./platform (reconciles first)
apps.yaml Flux Kustomization → ./apps (dependsOn platform)
cluster-vars.yaml ConfigMap of overlay knobs (BASE defaults)
kustomization.yaml
dev/ ACTIVE build target — patches cluster-vars with dev values only
kustomization.yaml
prod/ DESIGN-ONLY until roadmap Phase 7 — patches cluster-vars with prod values only
kustomization.yaml
How the overlay model satisfies R-ENV-02
The base authors the reconciliation graph once. platform.yaml and apps.yaml (Flux
Kustomizations) both declare postBuild.substituteFrom the cluster-vars ConfigMap. Platform and
app manifests use ${TOKEN} placeholders for every value that legitimately differs between
environments (issuer, replica counts, storage sizes, retention, node placement).
clusters/dev and clusters/prod differ ONLY by the values they patch into cluster-vars —
they add no resources of their own and never copy/fork a base manifest. Promotion to prod
(docs/02) is a change to the
prod overlay's variables, nothing else.
How Flux is pointed at an environment
flux bootstrap (run by WS-INFRA in Phase 1) targets one environment's path per cluster:
# dev cluster
flux bootstrap ... --path=clusters/dev
# prod cluster (Phase 7 only — design-only until then)
flux bootstrap ... --path=clusters/prod
Bootstrap materializes the flux-system Kustomization that renders the chosen overlay, which pulls
in base/ and applies the env-scoped cluster-vars.
Reconciliation order
GitRepository (flux-system)
│
▼
Kustomization: platform (./platform, substituteFrom cluster-vars)
│ healthy
▼
Kustomization: apps (./apps, dependsOn platform, substituteFrom cluster-vars)
apps dependsOn platform so CNI/storage/TLS/DNS/gateway exist before any workload reconciles.
TODOs (later phases — do not action in Phase 0)
- Source cutover (WS-GITOPS, Phase 6):
base/flux-system.yamlcurrently points at the bootstrap source. After Gitea is onboarded, repointspec.urltogitea.home.keithjackson.devand keep an off-cluster mirror (specdocs/05"Source-of-truth",CONTRIBUTING.md). - SOPS decryption (WS-SEC, Phase 1): add
spec.decryption.provider: sops(age secret name only, never plaintext) to the platform/apps Kustomizations once the age key is bootstrapped (ADR-0007). - Split ordered Flux Kustomizations if intra-platform ordering needs to be explicit (e.g. a
separate
cilium/longhornKustomization othersdependsOn).