Question

A development team writes an automation script that repeatedly runs 'gcloud projects add-iam-policy-binding' to grant a service account the roles/storage.objectViewer role across dozens of projects. During a code review, an operations engineer warns that concurrent executions of this command against the same project could silently overwrite each other's changes and lose bindings. As the cloud architect, what should you advise the team to do to make these IAM updates safe under concurrency?

Accepted Answer

Advise the team to use 'gcloud projects set-iam-policy' after fetching the policy with an etag, so updates are rejected if the policy changed since it was read.

Answer

Advise the team to keep using 'add-iam-policy-binding' but add a '--quiet' flag so the command skips confirmation prompts and completes faster.

Answer

Advise the team to wrap the calls in a retry loop with exponential backoff, which fully eliminates the possibility of lost updates.

Answer

Advise the team to grant the role at the organization level once so no per-project binding scripts are ever needed.