How to enable Uniform Bucket-level Access for Bucket in Google Cloud
Priyam Singh
~ 2 min read

Introduction
It is recommended to use uniform bucket-level access to unify and simplify how you grant access to your Cloud Storage resources. Cloud Storage offers two systems for granting users permission to access your buckets and objects: Cloud Identity and Access Management (Cloud IAM) and Access Control Lists (ACLs). These systems act in parallel - in order for a user to access a Cloud Storage resource, only one of the systems needs to grant the user permission. Cloud IAM is used throughout Google Cloud and allows you to grant a variety of permissions at the bucket and project levels. ACLs are used only by Cloud Storage and have limited permission options, but they allow you to grant permissions on a per-object basis.
In order to support a uniform permissioning system, Cloud Storage has uniform bucket-level access. Using this feature disables ACLs for all Cloud Storage resources: access to Cloud Storage resources then is granted exclusively through Cloud IAM. Enabling uniform bucket-level access guarantees that if a Storage bucket is not publicly accessible, no object in the bucket is publicly accessible either.
Steps to enable uniform Bucket-level Access for Bucket using Console
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Open the Cloud Storage browser in the Google Cloud Console
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In the list of buckets, click on the name of the desired bucket.
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Select the Permissions tab near the top of the page.
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In the text box in which it is written as Access control click Switch to Uniform
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In the pop-up menu that appears, select Uniform
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Select the Add project role ACLs to the bucket IAM policy checkbox
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Click Save