register-referentie/infra/helm/big-reference/templates/edge.yaml

{{- /*
The public TLS edge (ADR-0035). Rendered only when `public.domain` is set; with it
empty the stack is reached on the NodePorts below and nothing here exists.

Caddy rather than an ingress controller: the four portals already run caddy:2-alpine,
so this adds no dependency, and it does ACME itself — no cert-manager, no CRDs, no
Ingress objects for five hostnames that never change. It proxies to the ClusterIP
services, so the browser-facing NodePorts are not involved in a public deployment.

The public IP lives on the Fedora host, which forwards 80/443 to the two NodePorts
below. That forward is dumb L4 — no TLS, no routing — see the runbook.
*/}}
{{- if .Values.public.domain }}
{{- $pub := .Values.public }}
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: caddy-edge-config
  labels:
{{- include "big.labels" (dict "root" $ "name" "caddy-edge") | nindent 4 }}
data:
  Caddyfile: |
    {
      {{- with $pub.email }}
      email {{ . }}
      {{- end }}
    }
    {{- range $sub, $target := $pub.routes }}

    {{ $sub }}.{{ $pub.domain }} {
      reverse_proxy {{ $target }}
    }
    {{- end }}
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: caddy-edge
  labels:
{{- include "big.labels" (dict "root" $ "name" "caddy-edge") | nindent 4 }}
spec:
  replicas: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app.kubernetes.io/name: caddy-edge
      app.kubernetes.io/instance: {{ .Release.Name }}
  template:
    metadata:
      annotations:
        # A ConfigMap mounted with subPath never updates in place, so a changed
        # Caddyfile has to roll the pod.
        checksum/caddyfile: {{ printf "%s|%v|%v" $pub.domain $pub.email $pub.routes | sha256sum }}
      labels:
{{- include "big.labels" (dict "root" $ "name" "caddy-edge") | nindent 8 }}
    spec:
      containers:
        - name: caddy-edge
          image: {{ $pub.image }}
          ports:
            - name: http
              containerPort: 80
            - name: https
              containerPort: 443
          # TCP, not HTTP: a GET with no matching Host gets a 404 from Caddy, which
          # would fail an httpGet probe for a perfectly healthy edge.
          readinessProbe:
            tcpSocket: { port: 443 }
          volumeMounts:
            - name: config
              mountPath: /etc/caddy/Caddyfile
              subPath: Caddyfile
              readOnly: true
            - name: data
              mountPath: /data
            - name: run
              mountPath: /config
      volumes:
        - name: config
          configMap:
            name: caddy-edge-config
        - name: run
          emptyDir: {}
        - name: data
          {{- if .Values.persistence.storageClass }}
          persistentVolumeClaim:
            claimName: caddy-edge-data
          {{- else }}
          # Certificates live here. On an emptyDir every pod restart asks Let's
          # Encrypt again, and its duplicate-certificate limit is five per week —
          # set persistence.storageClass for anything that stays up.
          emptyDir: {}
          {{- end }}
---
apiVersion: v1
kind: Service
metadata:
  name: caddy-edge
  labels:
{{- include "big.labels" (dict "root" $ "name" "caddy-edge") | nindent 4 }}
spec:
  type: NodePort
  selector:
    app.kubernetes.io/name: caddy-edge
    app.kubernetes.io/instance: {{ .Release.Name }}
  ports:
    - name: http
      port: 80
      targetPort: 80
      nodePort: {{ $pub.nodePorts.http }}
    - name: https
      port: 443
      targetPort: 443
      nodePort: {{ $pub.nodePorts.https }}
{{- if .Values.persistence.storageClass }}
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: caddy-edge-data
  labels:
{{- include "big.labels" (dict "root" $ "name" "caddy-edge") | nindent 4 }}
  # Keep the certificates when the release is uninstalled — re-issuing them on
  # every reinstall is what burns the rate limit.
  annotations:
    helm.sh/resource-policy: keep
spec:
  accessModes: [ReadWriteOnce]
  storageClassName: {{ .Values.persistence.storageClass }}
  resources:
    requests:
      storage: 128Mi
{{- end }}
{{- end }}