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Securing your Cloud Storage data is critical. Google Cloud provides two access control models — IAM (Identity and Access Management) and Access Control Lists (ACLs) — along with additional features like public access prevention and VPC Service Controls.
Uniform access uses IAM only to control access to the bucket and its objects. ACLs are disabled, providing a simpler, more consistent security model.
# Enable uniform bucket-level access
gsutil uniformbucketlevelaccess set on gs://my-bucket
Important: After enabling uniform access, there is a 90-day grace period during which you can revert. After 90 days, it becomes permanent.
Fine-grained access allows per-object ACLs in addition to IAM. This is the legacy model and is generally not recommended for new buckets because:
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