Jan Novak
a78e4421ef
Kubernetes operator that automates HTTPS listener configuration on
Gateway API Gateway resources whenever a cert-manager Certificate is
created or updated.
Core behaviour:
- Watches cert-manager Certificate resources for the annotation
gateway-cert-operator.io/gateway-name to identify the target Gateway
- Builds HTTPS listeners (prefixed "auto-") from each Certificate's
DNS SANs and merges them into the target Gateway's listener list
- Preserves any manually-managed listeners; removes stale auto-listeners
when Certificates are deleted or their annotations are removed
- Supports optional annotations to override the target namespace and
listener port (default 443)
Components:
- main.go – manager setup, scheme registration,
health/readiness probes
- internal/controller/ – Certificate reconciler with field
indexing and dual-watch pattern
- internal/gateway/patch.go – listener construction, merge, and
equality helpers
- deploy/manifests.yaml – Namespace, RBAC, and Deployment
- docs/README.md – usage guide and architecture notes
- Dockerfile – distroless multi-stage build
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
103 lines
2.5 KiB
YAML
103 lines
2.5 KiB
YAML
---
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apiVersion: v1
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kind: Namespace
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metadata:
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name: gateway-cert-operator-system
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---
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: gateway-cert-operator
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namespace: gateway-cert-operator-system
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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name: gateway-cert-operator
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rules:
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# Watch and read Certificates
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- apiGroups: ["cert-manager.io"]
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resources: ["certificates"]
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verbs: ["get", "list", "watch"]
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# Read and patch Gateways
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- apiGroups: ["gateway.networking.k8s.io"]
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resources: ["gateways"]
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verbs: ["get", "list", "watch", "patch"]
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# Emit events
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- apiGroups: [""]
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resources: ["events"]
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verbs: ["create", "patch"]
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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name: gateway-cert-operator
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: gateway-cert-operator
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subjects:
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- kind: ServiceAccount
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name: gateway-cert-operator
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namespace: gateway-cert-operator-system
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: gateway-cert-operator
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namespace: gateway-cert-operator-system
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labels:
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app.kubernetes.io/name: gateway-cert-operator
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spec:
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replicas: 1
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selector:
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matchLabels:
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app.kubernetes.io/name: gateway-cert-operator
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template:
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metadata:
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labels:
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app.kubernetes.io/name: gateway-cert-operator
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spec:
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serviceAccountName: gateway-cert-operator
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securityContext:
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runAsNonRoot: true
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seccompProfile:
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type: RuntimeDefault
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containers:
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- name: manager
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image: gateway-cert-operator:latest
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args:
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- --metrics-bind-address=:8080
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- --health-probe-bind-address=:8081
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ports:
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- name: metrics
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containerPort: 8080
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protocol: TCP
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- name: healthz
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containerPort: 8081
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protocol: TCP
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livenessProbe:
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httpGet:
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path: /healthz
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port: healthz
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initialDelaySeconds: 5
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periodSeconds: 10
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readinessProbe:
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httpGet:
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path: /readyz
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port: healthz
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initialDelaySeconds: 5
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periodSeconds: 10
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resources:
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limits:
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cpu: 100m
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memory: 64Mi
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requests:
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cpu: 50m
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memory: 32Mi
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securityContext:
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allowPrivilegeEscalation: false
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readOnlyRootFilesystem: true
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capabilities:
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drop: ["ALL"]
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