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kustomize/components/single-shared-session/README.md

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+# Manage a single shared session for the Online Boutique apps
+
+By default, when you deploy this sample app, the Online Boutique's `frontend` generates a `shop_session-id` cookie per browser session.
+But you may want to share one unique `shop_session-id` cookie across all browser sessions.
+This is useful for multi-cluster environments.
+
+## Deploy Online Boutique to generate a single shared session
+
+To automate the deployment of Online Boutique to manage a single shared session you can leverage the following variation with [Kustomize](../..).
+
+From the `kustomize/` folder at the root level of this repository, execute this command:
+
+```bash
+kustomize edit add component components/single-shared-session
+```
+
+This will update the `kustomize/kustomization.yaml` file which could be similar to:
+
+```yaml
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- base
+components:
+- components/single-shared-session
+```
+
+You can locally render these manifests by running `kubectl kustomize .` as well as deploying them by running `kubectl apply -k .`.

kustomize/components/single-shared-session/kustomization.yaml

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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: kustomize.config.k8s.io/v1alpha1
+kind: Component
+patches:
+# frontend - ENABLE_SINGLE_SHARED_SESSION
+- patch: |-
+    apiVersion: apps/v1
+    kind: Deployment
+    metadata:
+      name: frontend
+    spec:
+      template:
+        spec:
+          containers:
+            - name: server
+              env:
+              - name: ENABLE_SINGLE_SHARED_SESSION
+                value: "true"