To use Oracle Cloud Infrastructure, an administrator must be a member of a group granted security access in a policy by a tenancy administrator. This access is required whether you're using the Console or the REST API with an SDK, CLI, or other tool. If you get a message that you don't have permission or are unauthorized, verify with the tenancy administrator what type of access you have and which compartment your access works in.
For administrators: To allow users to do all things with compute clusters in all compartments, write the following policy:
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Allow group ComputeClusterUsers to manage compute-clusters in tenancy