1. Open the GCP Console and navigate to the Cloud Storage page.
2. Click on the name of the bucket that you want to enable for Cloud CDN.
3. Click on the “Edit bucket details” button at the top of the page.
4. Scroll down to the “Cloud CDN” section and click on the “Enable Cloud CDN” checkbox.
5. Click on the “Save” button at the bottom of the page to save the changes.

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1. Open the Cloud Shell in the GCP console.
2. Run the following command to enable the Cloud CDN API:
   gcloud services enable cdn.googleapis.com
   
3. Run the following command to create a Cloud Storage bucket:
   gsutil mb -c standard -l <location> gs://<bucket-name>
   
   Replace <location> with the location where you want to create the bucket (e.g. us-central1) and <bucket-name> with the name of your bucket.
4. Run the following command to enable the Cloud CDN for the bucket:
   gsutil web set -m index.html -e 404.html gs://<bucket-name>
   
   This command sets up the bucket as a static website and enables the Cloud CDN for it.
5. Verify that the Cloud CDN is enabled for the bucket by running the following command:
   gcloud compute backend-buckets describe <backend-bucket-name>
   
   Replace <backend-bucket-name> with the name of your backend bucket. Look for the cdnPolicy field in the output. It should show "cacheMode": "CACHE_ALL_STATIC" which confirms that the Cloud CDN is enabled for the bucket.
6. Repeat steps 3-5 for each backend bucket that needs the Cloud CDN enabled.

1. Import the necessary libraries:

from google.cloud import compute_v1
from google.protobuf.field_mask_pb2 import FieldMask

2. Set up the GCP credentials:

# Replace [PATH_TO_YOUR_CREDENTIALS_JSON] with the path to your GCP credentials JSON file.
import os
os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "[PATH_TO_YOUR_CREDENTIALS_JSON]"

3. Initialize the Compute Engine client:

client = compute_v1.ComputeClient()

4. Get the current configuration of the backend bucket:

# Replace [BACKEND_BUCKET_NAME] with the name of the backend bucket.
backend_bucket_name = "[BACKEND_BUCKET_NAME]"
backend_bucket = client.backend_buckets.get(project="[PROJECT_ID]", backend_bucket=backend_bucket_name)

5. Update the configuration to enable CDN:

# Set the CDN configuration.
backend_bucket.cdn_policy.cache_key_policy.include_host = True
backend_bucket.cdn_policy.cache_mode = compute_v1.BackendBucketCdnPolicy.CacheMode.CACHE_ALL_STATIC
backend_bucket.cdn_policy.signed_url_key_names.append("my-key-name")

# Update the backend bucket.
update_mask = FieldMask(paths=["cdn_policy"])
updated_backend_bucket = client.backend_buckets.update(project="[PROJECT_ID]", backend_bucket=backend_bucket_name, backend_bucket_resource=backend_bucket, update_mask=update_mask)

6. Verify that CDN is enabled:

print(updated_backend_bucket.cdn_policy.cache_mode)