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kustomize/components/container-images-tag/README.md

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+# Update the container image tag of the Online Boutique apps
+
+By default, the Online Boutique apps are targeting the latest release version (see the list of versions [here](https://github.com/GoogleCloudPlatform/microservices-demo/releases)). You may need to change this image tag to target a specific version, this Kustomize variation will help you setting this up.
+
+## Change the default container image tag via Kustomize
+
+To automate the deployment of the Online Boutique apps with a specific container imag tag, you can leverage the following variation with [Kustomize](../..).
+
+From the `kustomize/` folder at the root level of this repository, execute this command:
+
+```bash
+TAG=v1.0.0
+sed -i "s/CONTAINER_IMAGES_TAG/$TAG/g" components/container-images-tag/kustomization.yaml
+kustomize edit add component components/container-images-tag
+```
+
+_Note: this Kustomize component will update the container image tag of the `image:` field in all `Deployments`._
+
+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/container-images-tag
+```
+
+You can locally render these manifests by running `kubectl kustomize .` as well as deploying them by running `kubectl apply -k .`.
+
+**Important notes:** if combining with the other variations, here are some considerations:
+
+- should be placed before `components/container-images-registry`
+
+So for example here is the order respected:
+
+```yaml
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- base
+components:
+- components/container-images-tag
+- components/container-images-registry
+```

kustomize/components/container-images-tag/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
+images:
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/adservice
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/cartservice
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/checkoutservice
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/currencyservice
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/emailservice
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/frontend
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/loadgenerator
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/paymentservice
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/productcatalogservice
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/recommendationservice
+  newTag: CONTAINER_IMAGES_TAG
+- name: us-central1-docker.pkg.dev/google-samples/microservices-demo/shippingservice
+  newTag: CONTAINER_IMAGES_TAG