Add Authentik identity provider deployment (#211)

## Summary
- Deploy Authentik (identity.unkin.net) via Helm chart 2026.5.3
- CNPG PostgreSQL cluster (3 instances) with separate rw/ro poolers (2 instances each)
- Redis with 5Gi persistent storage
- Gateway API for HTTPS (identity.unkin.net) and LDAPS (ldap.k8s.syd1.au.unkin.net, ldap.main.unkin.net)
- TLSRoute for LDAPS passthrough, HTTPRoute for external-dns record creation
- Vault secrets for postgres credentials, authentik secret key, and S3 storage credentials
- S3 storage via RadosGW (bucket: authentik)
- 3 server replicas, 2 worker replicas
- Woodpecker ServiceAccount for terraform-authentik CI
- Platform applicationset and project updated

## Dependencies
- terraform-git #15 (merged) — repo definition
- terraform-vault #78 (merged) — auth roles and Consul ACL

## Vault secrets needed before deploy
Write to `kv/kubernetes/namespace/authentik/default/`:
- `postgres-credentials`: username + password
- `authentik-credentials`: AUTHENTIK_SECRET_KEY
- `s3-credentials`: S3 access key + secret key

Reviewed-on: #211
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>

apps/base/authentik/cnpg_cluster.yaml

@@ -0,0 +1,91 @@
+---
+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  name: postgres
+  namespace: authentik
+spec:
+  affinity:
+    podAntiAffinityType: preferred
+  bootstrap:
+    initdb:
+      database: authentik
+      encoding: UTF8
+      localeCType: C
+      localeCollate: C
+      owner: authentik
+      secret:
+        name: postgres-credentials
+  enablePDB: true
+  enableSuperuserAccess: false
+  failoverDelay: 0
+  imageName: ghcr.io/cloudnative-pg/postgresql:18.1-system-trixie
+  instances: 3
+  logLevel: info
+  maxSyncReplicas: 0
+  minSyncReplicas: 0
+  monitoring:
+    customQueriesConfigMap:
+      - key: queries
+        name: cnpg-default-monitoring
+    disableDefaultQueries: false
+    enablePodMonitor: false
+  postgresql:
+    parameters:
+      archive_mode: "on"
+      archive_timeout: 5min
+      dynamic_shared_memory_type: posix
+      effective_cache_size: 256MB
+      full_page_writes: "on"
+      log_destination: csvlog
+      log_directory: /controller/log
+      log_filename: postgres
+      log_rotation_age: "0"
+      log_rotation_size: "0"
+      log_truncate_on_rotation: "false"
+      logging_collector: "on"
+      max_connections: "200"
+      max_parallel_workers: "16"
+      max_replication_slots: "16"
+      max_worker_processes: "16"
+      shared_buffers: 128MB
+      shared_memory_type: mmap
+      ssl_max_protocol_version: TLSv1.3
+      ssl_min_protocol_version: TLSv1.3
+      wal_keep_size: 256MB
+      wal_level: logical
+      wal_log_hints: "on"
+      wal_receiver_timeout: 5s
+      wal_sender_timeout: 5s
+    syncReplicaElectionConstraint:
+      enabled: false
+  primaryUpdateMethod: restart
+  primaryUpdateStrategy: unsupervised
+  probes:
+    liveness:
+      isolationCheck:
+        connectionTimeout: 1000
+        enabled: true
+        requestTimeout: 1000
+  replicationSlots:
+    highAvailability:
+      enabled: true
+      slotPrefix: _cnpg_
+    synchronizeReplicas:
+      enabled: true
+    updateInterval: 30
+  resources:
+    limits:
+      cpu: 500m
+      memory: 512Mi
+    requests:
+      cpu: 250m
+      memory: 256Mi
+  smartShutdownTimeout: 180
+  startDelay: 3600
+  stopDelay: 1800
+  storage:
+    resizeInUseVolumes: true
+    size: 20Gi
+    storageClass: cephrbd-fast-delete
+  switchoverDelay: 3600

apps/base/authentik/cnpg_pooler.yaml

@@ -0,0 +1,66 @@
+---
+apiVersion: postgresql.cnpg.io/v1
+kind: Pooler
+metadata:
+  name: postgres-pooler-rw
+  namespace: authentik
+spec:
+  cluster:
+    name: postgres
+  instances: 2
+  pgbouncer:
+    parameters:
+      default_pool_size: "100"
+      max_client_conn: "400"
+    paused: false
+    poolMode: session
+  template:
+    metadata:
+      labels:
+        app: pooler-rw
+    spec:
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: app
+                    operator: In
+                    values:
+                      - pooler-rw
+              topologyKey: kubernetes.io/hostname
+      containers: []
+  type: rw
+---
+apiVersion: postgresql.cnpg.io/v1
+kind: Pooler
+metadata:
+  name: postgres-pooler-ro
+  namespace: authentik
+spec:
+  cluster:
+    name: postgres
+  instances: 2
+  pgbouncer:
+    parameters:
+      default_pool_size: "100"
+      max_client_conn: "400"
+    paused: false
+    poolMode: session
+  template:
+    metadata:
+      labels:
+        app: pooler-ro
+    spec:
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: app
+                    operator: In
+                    values:
+                      - pooler-ro
+              topologyKey: kubernetes.io/hostname
+      containers: []
+  type: ro

apps/base/authentik/gateway.yaml

@@ -0,0 +1,57 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  labels:
+    traefik.io/instance: internal
+  annotations:
+    cert-manager.io/cluster-issuer: vault-issuer
+    cert-manager.io/common-name: identity.unkin.net
+    cert-manager.io/private-key-size: "4096"
+    external-dns.alpha.kubernetes.io/hostname: identity.unkin.net,identity.k8s.syd1.au.unkin.net
+    external-dns.alpha.kubernetes.io/target: 198.18.200.4
+  name: authentik
+  namespace: authentik
+spec:
+  gatewayClassName: traefik-internal
+  listeners:
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: identity.unkin.net
+      name: http
+      port: 80
+      protocol: HTTP
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: identity.unkin.net
+      name: https
+      port: 443
+      protocol: HTTPS
+      tls:
+        certificateRefs:
+          - group: ""
+            kind: Secret
+            name: authentik-tls
+        mode: Terminate
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: identity.k8s.syd1.au.unkin.net
+      name: http-internal
+      port: 80
+      protocol: HTTP
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: identity.k8s.syd1.au.unkin.net
+      name: https-internal
+      port: 443
+      protocol: HTTPS
+      tls:
+        certificateRefs:
+          - group: ""
+            kind: Secret
+            name: authentik-tls
+        mode: Terminate

apps/base/authentik/httproute.yaml

@@ -0,0 +1,59 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: authentik-http-redirect
+  namespace: authentik
+spec:
+  hostnames:
+    - identity.unkin.net
+    - identity.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: authentik
+      sectionName: http
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: authentik
+      sectionName: http-internal
+  rules:
+    - filters:
+        - type: RequestRedirect
+          requestRedirect:
+            scheme: https
+            statusCode: 301
+      matches:
+        - path:
+            type: PathPrefix
+            value: /
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: authentik
+  namespace: authentik
+spec:
+  hostnames:
+    - identity.unkin.net
+    - identity.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: authentik
+      sectionName: https
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: authentik
+      sectionName: https-internal
+  rules:
+    - backendRefs:
+        - group: ""
+          kind: Service
+          name: authentik-server
+          port: 80
+          weight: 1
+      matches:
+        - path:
+            type: PathPrefix
+            value: /

apps/base/authentik/kustomization.yaml

@@ -0,0 +1,19 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - cnpg_cluster.yaml
+  - cnpg_pooler.yaml
+  - gateway.yaml
+  - httproute.yaml
+  - ldap-gateway.yaml
+  - ldap-httproute.yaml
+  - ldap-service.yaml
+  - ldap-tlsroute.yaml
+  - namespace.yaml
+  - redis-deployment.yaml
+  - redis-pvc.yaml
+  - redis-service.yaml
+  - vaultauth.yaml
+  - vaultstaticsecret.yaml

apps/base/authentik/ldap-gateway.yaml

@@ -0,0 +1,47 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  labels:
+    traefik.io/instance: internal
+  annotations:
+    cert-manager.io/cluster-issuer: vault-issuer
+    cert-manager.io/common-name: ldap.k8s.syd1.au.unkin.net
+    cert-manager.io/private-key-size: "4096"
+  name: authentik-ldap
+  namespace: authentik
+spec:
+  gatewayClassName: traefik-internal
+  listeners:
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: ldap.k8s.syd1.au.unkin.net
+      name: ldaps-internal
+      port: 636
+      protocol: TLS
+      tls:
+        mode: Passthrough
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: ldap.main.unkin.net
+      name: ldaps-main
+      port: 636
+      protocol: TLS
+      tls:
+        mode: Passthrough
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: ldap.k8s.syd1.au.unkin.net
+      name: http-dns
+      port: 80
+      protocol: HTTP
+    - allowedRoutes:
+        namespaces:
+          from: Same
+      hostname: ldap.main.unkin.net
+      name: http-dns-main
+      port: 80
+      protocol: HTTP

apps/base/authentik/ldap-httproute.yaml

@@ -0,0 +1,32 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: authentik-ldap-dns
+  namespace: authentik
+  annotations:
+    external-dns.alpha.kubernetes.io/hostname: ldap.k8s.syd1.au.unkin.net,ldap.main.unkin.net
+    external-dns.alpha.kubernetes.io/target: 198.18.200.4
+spec:
+  hostnames:
+    - ldap.k8s.syd1.au.unkin.net
+    - ldap.main.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: authentik-ldap
+      sectionName: http-dns
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: authentik-ldap
+      sectionName: http-dns-main
+  rules:
+    - filters:
+        - type: RequestRedirect
+          requestRedirect:
+            scheme: https
+            statusCode: 301
+      matches:
+        - path:
+            type: PathPrefix
+            value: /

apps/base/authentik/ldap-service.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: authentik-ldap
+  namespace: authentik
+spec:
+  internalTrafficPolicy: Cluster
+  ports:
+    - name: ldaps
+      port: 6636
+      protocol: TCP
+      targetPort: 6636
+  selector:
+    app.kubernetes.io/name: authentik
+    app.kubernetes.io/component: ldap
+  sessionAffinity: None
+  type: ClusterIP

apps/base/authentik/ldap-tlsroute.yaml

@@ -0,0 +1,26 @@
+---
+apiVersion: gateway.networking.k8s.io/v1alpha2
+kind: TLSRoute
+metadata:
+  name: authentik-ldaps
+  namespace: authentik
+spec:
+  hostnames:
+    - ldap.k8s.syd1.au.unkin.net
+    - ldap.main.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: authentik-ldap
+      sectionName: ldaps-internal
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: authentik-ldap
+      sectionName: ldaps-main
+  rules:
+    - backendRefs:
+        - group: ""
+          kind: Service
+          name: authentik-ldap
+          port: 6636
+          weight: 1

apps/base/authentik/namespace.yaml

@@ -0,0 +1,5 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: authentik

apps/base/authentik/redis-deployment.yaml

@@ -0,0 +1,58 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: redis
+  namespace: authentik
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: redis
+  template:
+    metadata:
+      labels:
+        app: redis
+    spec:
+      containers:
+        - name: redis
+          image: redis:7-alpine
+          imagePullPolicy: IfNotPresent
+          args:
+            - --save
+            - "20"
+            - "1"
+          ports:
+            - containerPort: 6379
+              name: redis
+              protocol: TCP
+          livenessProbe:
+            exec:
+              command:
+                - redis-cli
+                - ping
+            initialDelaySeconds: 5
+            periodSeconds: 10
+          readinessProbe:
+            exec:
+              command:
+                - redis-cli
+                - ping
+            initialDelaySeconds: 5
+            periodSeconds: 10
+          resources:
+            limits:
+              cpu: 500m
+              memory: 512Mi
+            requests:
+              cpu: 50m
+              memory: 128Mi
+          volumeMounts:
+            - mountPath: /data
+              name: redis-data
+      volumes:
+        - name: redis-data
+          persistentVolumeClaim:
+            claimName: redis-data

apps/base/authentik/redis-pvc.yaml

@@ -0,0 +1,13 @@
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: redis-data
+  namespace: authentik
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 5Gi
+  storageClassName: cephrbd-fast-delete

apps/base/authentik/redis-service.yaml

@@ -0,0 +1,17 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis
+  namespace: authentik
+spec:
+  internalTrafficPolicy: Cluster
+  ports:
+    - name: redis
+      port: 6379
+      protocol: TCP
+      targetPort: redis
+  selector:
+    app: redis
+  sessionAffinity: None
+  type: ClusterIP

apps/base/authentik/vaultauth.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultAuth
+metadata:
+  name: default
+  namespace: authentik
+spec:
+  allowedNamespaces:
+    - authentik
+  kubernetes:
+    audiences:
+      - vault
+    role: default
+    serviceAccount: default
+    tokenExpirationSeconds: 600
+  method: kubernetes
+  mount: k8s/au/syd1
+  vaultConnectionRef: vso-system/default

apps/base/authentik/vaultstaticsecret.yaml

@@ -0,0 +1,51 @@
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: postgres-credentials
+  namespace: authentik
+spec:
+  destination:
+    create: true
+    name: postgres-credentials
+    overwrite: true
+  hmacSecretData: true
+  mount: kv
+  path: kubernetes/namespace/authentik/default/postgres-credentials
+  refreshAfter: 5m
+  type: kv-v2
+  vaultAuthRef: default
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: authentik-credentials
+  namespace: authentik
+spec:
+  destination:
+    create: true
+    name: authentik-credentials
+    overwrite: true
+  hmacSecretData: true
+  mount: kv
+  path: kubernetes/namespace/authentik/default/authentik-credentials
+  refreshAfter: 5m
+  type: kv-v2
+  vaultAuthRef: default
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: s3-credentials
+  namespace: authentik
+spec:
+  destination:
+    create: true
+    name: s3-credentials
+    overwrite: true
+  hmacSecretData: true
+  mount: kv
+  path: kubernetes/namespace/authentik/default/s3-credentials
+  refreshAfter: 5m
+  type: kv-v2
+  vaultAuthRef: default

apps/base/woodpecker/kustomization.yaml

@@ -7,6 +7,7 @@ resources:
   - cnpg_cluster.yaml
   - cnpg_pooler.yaml
   - serviceaccount_terraform_artifactapi.yaml
+  - serviceaccount_terraform_authentik.yaml
   - serviceaccount_terraform_git.yaml
   - serviceaccount_terraform_vault.yaml
   - vaultauth.yaml

apps/base/woodpecker/serviceaccount_terraform_authentik.yaml

@@ -0,0 +1,6 @@
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: terraform-authentik
+  namespace: woodpecker

apps/overlays/au-syd1/authentik/kustomization.yaml

@@ -0,0 +1,14 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../../base/authentik
+
+helmCharts:
+  - name: authentik
+    repo: https://artifactapi.k8s.syd1.au.unkin.net/api/v1/virtual/helm
+    version: "2026.5.3"
+    releaseName: authentik
+    namespace: authentik
+    valuesFile: values.yaml

apps/overlays/au-syd1/authentik/values.yaml

@@ -0,0 +1,105 @@
+global:
+  env:
+    # PostgreSQL primary (via pooler)
+    - name: AUTHENTIK_POSTGRESQL__HOST
+      value: postgres-pooler-rw
+    - name: AUTHENTIK_POSTGRESQL__PORT
+      value: "5432"
+    - name: AUTHENTIK_POSTGRESQL__NAME
+      value: authentik
+    - name: AUTHENTIK_POSTGRESQL__USER
+      valueFrom:
+        secretKeyRef:
+          name: postgres-credentials
+          key: username
+    - name: AUTHENTIK_POSTGRESQL__PASSWORD
+      valueFrom:
+        secretKeyRef:
+          name: postgres-credentials
+          key: password
+    # PostgreSQL read replica (via pooler)
+    - name: AUTHENTIK_POSTGRESQL__READ_REPLICAS__0__HOST
+      value: postgres-pooler-ro
+    - name: AUTHENTIK_POSTGRESQL__READ_REPLICAS__0__PORT
+      value: "5432"
+    - name: AUTHENTIK_POSTGRESQL__READ_REPLICAS__0__NAME
+      value: authentik
+    - name: AUTHENTIK_POSTGRESQL__READ_REPLICAS__0__USER
+      valueFrom:
+        secretKeyRef:
+          name: postgres-credentials
+          key: username
+    - name: AUTHENTIK_POSTGRESQL__READ_REPLICAS__0__PASSWORD
+      valueFrom:
+        secretKeyRef:
+          name: postgres-credentials
+          key: password
+    # PostgreSQL pooler settings
+    - name: AUTHENTIK_POSTGRESQL__DISABLE_SERVER_SIDE_CURSORS
+      value: "true"
+    - name: AUTHENTIK_POSTGRESQL__CONN_MAX_AGE
+      value: "0"
+    - name: AUTHENTIK_POSTGRESQL__CONN_HEALTH_CHECKS
+      value: "true"
+    # Redis
+    - name: AUTHENTIK_REDIS__HOST
+      value: redis
+    - name: AUTHENTIK_REDIS__PORT
+      value: "6379"
+    # S3 storage
+    - name: AUTHENTIK_STORAGE__BACKEND
+      value: s3
+    - name: AUTHENTIK_STORAGE__S3__ENDPOINT
+      value: https://radosgw.service.consul/
+    - name: AUTHENTIK_STORAGE__S3__BUCKET_NAME
+      value: authentik
+    - name: AUTHENTIK_STORAGE__S3__ADDRESSING_STYLE
+      value: path
+    - name: AUTHENTIK_STORAGE__S3__ACCESS_KEY
+      valueFrom:
+        secretKeyRef:
+          name: s3-credentials
+          key: AUTHENTIK_STORAGE__S3__ACCESS_KEY
+    - name: AUTHENTIK_STORAGE__S3__SECRET_KEY
+      valueFrom:
+        secretKeyRef:
+          name: s3-credentials
+          key: AUTHENTIK_STORAGE__S3__SECRET_KEY
+    # Secret key
+    - name: AUTHENTIK_SECRET_KEY
+      valueFrom:
+        secretKeyRef:
+          name: authentik-credentials
+          key: AUTHENTIK_SECRET_KEY
+
+server:
+  replicas: 3
+  annotations:
+    reloader.stakater.com/auto: "true"
+  ingress:
+    enabled: false
+  resources:
+    limits:
+      cpu: "2"
+      memory: 2Gi
+    requests:
+      cpu: 250m
+      memory: 512Mi
+
+worker:
+  replicas: 2
+  annotations:
+    reloader.stakater.com/auto: "true"
+  resources:
+    limits:
+      cpu: "2"
+      memory: 2Gi
+    requests:
+      cpu: 250m
+      memory: 512Mi
+
+postgresql:
+  enabled: false
+
+redis:
+  enabled: false

argocd/applicationsets/platform.yaml

@@ -10,6 +10,7 @@ spec:
       repoURL: https://git.unkin.net/unkin/argocd-apps
       revision: HEAD
       directories:
+      - path: apps/overlays/*/authentik
       - path: apps/overlays/*/artifactapi
       - path: apps/overlays/*/age-api
       - path: apps/overlays/*/cattle-system

argocd/projects/platform.yaml

@@ -19,6 +19,8 @@ spec:
       server: https://kubernetes.default.svc
     - namespace: 'age-api'
       server: https://kubernetes.default.svc
+    - namespace: 'authentik'
+      server: https://kubernetes.default.svc
     - namespace: 'cert-manager'
       server: https://kubernetes.default.svc
     - namespace: 'certificates'