How do I implement blue/green deployments for GCP Cloud Build?

Blue/Green deployments are a deployment strategy that reduces downtime and risk by running two environments, Blue and Green. In Google Cloud Platform (GCP), you can implement Blue/Green deployments using Cloud Build along with other GCP services like Cloud Run or Kubernetes. This guide provides an example of setting up a Blue/Green deployment using GCP Cloud Build.

Step-by-Step Implementation

  1. Create two environments: Blue and Green.
  2. Set up your CI/CD pipeline in Cloud Build.
  3. Deploy your application to the inactive environment.
  4. Perform tests on the new deployment.
  5. Switch traffic to the new environment.
  6. Monitor the deployment and roll back if necessary.

Example Code

trigger: template: message: "Building and deploying to Blue/Green environments" steps: - name: 'gcr.io/cloud-builders/docker' args: ['build', '-t', 'gcr.io/$PROJECT_ID/my-app:latest', '.'] - name: 'gcr.io/cloud-builders/gcloud' args: ['run', 'deploy', 'my-app-blue', '--image', 'gcr.io/$PROJECT_ID/my-app:latest', '--region', 'us-central1', '--platform', 'managed', '--quiet'] - name: 'gcr.io/cloud-builders/gcloud' args: ['run', 'deploy', 'my-app-green', '--image', 'gcr.io/$PROJECT_ID/my-app:latest', '--region', 'us-central1', '--platform', 'managed', '--quiet', '--no-promote'] - name: 'gcr.io/cloud-builders/gcloud' args: ['run', 'services', 'update-traffic', 'my-app-green', '--to-latest', '--region', 'us-central1', '--platform', 'managed']

blue/green deployments GCP Cloud Build continuous integration deployment strategies

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