Google Cloud IAM troubleshooting: ask about one principal, resource and permission
Turn a broad access complaint into a precise policy question, and recognize where Policy Troubleshooter cannot answer it.
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Turn a broad access complaint into a precise policy question, and recognize where Policy Troubleshooter cannot answer it.
A worked Cloud Run example references an enabled Secret Manager version as an environment variable. The deployer’s account can access the secret. The service uses a dedicated runtime service account, and new instances fail around startup. Which identity and permission should be checked?
A fictional service exposes a secret through an environment variable using latest. After rotation, older instances keep working with the previous credential while newly started instances use the new one. The application team expected an immediate, simultaneous update. What deployment approach gives a more predictable result?
A service’s storage request is denied. In this illustrative case, Policy Troubleshooter reports that the named principal has the permission on the resource. The team has not checked whether the actual call crosses a VPC Service Controls boundary. Does the allowed result settle the whole access question?
An example container was changed to run as a non-root user. It starts, but reading a mounted Secret Manager file fails. The team verified that the runtime service account has secret access. What should be checked next, and why is this different from an environment-secret startup failure?
Environment variables and mounted secret files behave differently. Match the method to your application and test the failure path.