cloudbuild

Berglas Cloud Build Example

This guide assumes you have followed the setup instructions in the README. Specifically, it is assumed that you have created a project, Cloud Storage bucket, and Cloud KMS key.

At present, Cloud Build does not have a way to share environment variables across processes. All Berglas references must resolve to the filesystem and use a shared volume mount to pass along secrets.

1. Make sure you are in the examples/cloudbuild folder before continuing!

2. Enable the Cloud Build service:

   gcloud services enable --project $PROJECT_ID \
     cloudbuild.googleapis.com
   

3. Export the environment variables for your configuration:

   export PROJECT_ID=my-project
   export BUCKET_ID=my-bucket
   export KMS_KEY=projects/${PROJECT_ID}/locations/global/keyRings/berglas/cryptoKeys/berglas-key
   

4. Create two secrets using the berglas CLI (see README for installation instructions):

   berglas create ${BUCKET_ID}/api-key "xxx-yyy-zzz" \
     --key ${KMS_KEY}
   

   berglas create ${BUCKET_ID}/tls-key "=== BEGIN RSA PRIVATE KEY..." \
     --key ${KMS_KEY}
   

5. Get the Cloud Build service account email:

   PROJECT_NUMBER=$(gcloud projects describe ${PROJECT_ID} --format 'value(projectNumber)')
   export SA_EMAIL=${PROJECT_NUMBER}@cloudbuild.gserviceaccount.com
   

6. Grant the service account access to the secrets:

   berglas grant ${BUCKET_ID}/api-key --member serviceAccount:${SA_EMAIL}
   berglas grant ${BUCKET_ID}/tls-key --member serviceAccount:${SA_EMAIL}
   

7. Build a container using Cloud Build and publish it to Container Registry:

   gcloud builds submit \
     --project ${PROJECT_ID} \
     --substitutions=_BUCKET_ID=${BUCKET_ID} \
     .
   

8. (Optional) Revoke access to the secrets:

   berglas revoke ${BUCKET_ID}/api-key --member serviceAccount:${SA_EMAIL}
   berglas revoke ${BUCKET_ID}/tls-key --member serviceAccount:${SA_EMAIL}