You can skip most of the section titled 'Create a service account and add roles', except the part called 'Provide credentials to your application', you still need to do that part. You are unable to create or modify service accounts within Cloud Lab, so we added the necessary permissions to the Compute Engine default service account for you. Thus, you need to authenticate using the credentials of the Compute Engine default service account. You can get the json key following [these instructions](https://cloud.google.com/iam/docs/creating-managing-service-account-keys), but in brief, go to `IAM & Admin`. On the left menu click `Service Account`, click on `Compute Engine default service account`, at the top go to `Keys`. Select `Add Key` and then `Create new key`.
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