Feature kustomizationpatch

component-complex/base/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: app
+  labels:
+    role: app
+    # Track distinguishes between normal 'stable' deployment and 'canary' deployment.
+    # https://kubernetes.io/docs/concepts/cluster-administration/manage-deployment/#canary-deployments
+    track: stable
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      role: app
+      track: stable
+  template:
+    metadata:
+      labels:
+        role: app
+        track: stable
+    spec:
+      containers:
+        - name: app
+          image: nginx:latest
+          envFrom:
+            - configMapRef:
+                name: app

component-complex/base/kustomization.yaml

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+resources:
+  - deployment.yaml
+
+configMapGenerator:
+  - name: app
+    literals:
+      - downstreamServiceUrl=http://www.google.com

component-complex/overlays/ci/kustomization.yaml

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+# ci environment needs a stub server but no ingresses (only accessible internally)
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../../base
+components:
+  - ../../patches/stub
+namespace: ci

component-complex/overlays/demo-canary/kustomization.yaml

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+# demo-canary environment is the same as demo, but configured for the canary deployment
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../demo
+
+components:
+  - ../../patches/canary

component-complex/overlays/demo/kustomization.yaml

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+# demo environment needs a stub server and ingresses for app and stub
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../../base
+
+components:
+  - ../../patches/ingress-vars
+  - ../../patches/stub-ingress
+  - ../../patches/app-ingress
+namespace: demo

component-complex/overlays/prod-canary/kustomization.yaml

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+# prod-canary environment is the same as prod, but configured for the canary deployment
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../prod
+
+components:
+  - ../../patches/canary

component-complex/overlays/prod/kustomization.yaml

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+# prod environment needs an app ingress and no stub
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../../base
+
+components:
+  - ../../patches/ingress-vars
+  - ../../patches/app-ingress
+namespace: prod

component-complex/patches/app-ingress/app-ingress.yaml

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+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: app
+spec:
+  rules:
+  - host: app.$(NAMESPACE).tld
+    http:
+      paths:
+      - path: 
+        backend:
+          serviceName: app
+          servicePort: http

component-complex/patches/app-ingress/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+resources:
+  - app-ingress.yaml

component-complex/patches/canary/kustomization.yaml

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+# https://kubernetes.io/docs/concepts/cluster-administration/manage-deployment/#canary-deployments
+# https://medium.com/google-cloud/kubernetes-canary-deployments-for-mere-mortals-13728ce032fe
+# https://dev.to/mostlyjason/intro-to-deployment-strategies-blue-green-canary-and-more-3a3
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+
+replicas:
+  - name: app-canary
+    count: 1
+
+patches:
+  - patch: |-
+      # Need to change the deployment name so that the original app deployment still runs (with the old version)
+      - op: replace
+        path: /metadata/name
+        value: app-canary
+      # Need to change these so that the deployment can link to its pods correctly
+      # https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#selector
+      - op: replace
+        path: /metadata/labels/track
+        value: canary
+      - op: replace
+        path: /spec/selector/matchLabels/track
+        value: canary
+      - op: replace
+        path: /spec/template/metadata/labels/track
+        value: canary
+    target:
+      kind: Deployment
+      name: app

component-complex/patches/ingress-vars/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+vars:
+  - name: NAMESPACE
+    objref:
+      apiVersion: apps/v1
+      kind: Deployment
+      name: app
+    fieldref:
+      fieldpath: metadata.namespace
+
+configurations:
+  - kustomize-configuration.yaml

component-complex/patches/ingress-vars/kustomize-configuration.yaml

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+# Additional locations where variables can be interpolated
+varReference:
+  - path: spec/rules/host
+    kind: Ingress

component-complex/patches/stub-ingress/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+resources:
+  - ../stub
+  - stub-ingress.yaml

component-complex/patches/stub-ingress/kustomize-configuration.yaml

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+# Additional locations where variables can be interpolated
+varReference:
+  - path: spec/rules/host
+    kind: Ingress

component-complex/patches/stub-ingress/stub-ingress.yaml

@@ -0,0 +1,13 @@
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: stub
+spec:
+  rules:
+  - host: stub.$(NAMESPACE).tld
+    http:
+      paths:
+      - path: 
+        backend:
+          serviceName: stub
+          servicePort: http

component-complex/patches/stub/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+resources:
+  - stub-service.yaml
+  - stub-deployment.yaml
+
+configMapGenerator:
+  - name: app
+    behavior: merge
+    literals:
+      - downstreamServiceUrl=http://stub:9080

component-complex/patches/stub/stub-deployment.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: stub
+spec:
+  template:
+    spec:
+      containers:
+      - name: stub
+        image: nginx:latest

component-complex/patches/stub/stub-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: stub
+spec:
+  type: ClusterIP
+  selector:
+    role: stub
+  ports:
+  - name: http
+    port: 9080
+    protocol: TCP

component/base/deployment.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: my-deployment
+spec:
+  template:
+    spec:
+      containers:
+        - name: my-deployment
+          image: my-image

component/base/kustomization.yaml

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+resources:
+  - deployment.yaml
+
+configMapGenerator:
+  - name: app-config
+    literals:
+      - testValue1=from-base
+      - testValue2=from-base
+      - otherValue=from-base

component/overlays/aggregate/kustomization.yaml

@@ -0,0 +1,9 @@
+kind: Kustomization
+apiVersion: kustomize.config.k8s.io/v1beta1
+
+resources:
+  - ../../base
+
+components:
+  - ../../patches/patch1
+  - ../../patches/patch2

component/patches/patch1/kustomization.yaml

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+kind: Component
+apiVersion: kustomize.config.k8s.io/v1alpha1
+
+patchesStrategicMerge:
+  - patches/patch.yaml
+
+configMapGenerator:
+  - name: app-config
+    behavior: merge
+    literals:
+      - testValue1=from-patch1
+      - patchValue=from-patch1

component/patches/patch1/patches/patch.yaml

@@ -0,0 +1,6 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: my-deployment
+spec:
+  replicas: 2

component/patches/patch2/kustomization.yaml

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+kind: Component
+apiVersion: kustomize.config.k8s.io/v1alpha1
+
+patchesStrategicMerge:
+  - patches/patch.yaml
+
+configMapGenerator:
+  - name: app-config
+    behavior: merge
+    literals:
+      - testValue2=from-patch2
+      - patchValue=from-patch2

component/patches/patch2/patches/patch.yaml

@@ -0,0 +1,9 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: my-deployment
+spec:
+  template:
+    metadata:
+      labels:
+        app: my-app