Apply a custom IAM JSON policy for anonymous bucket access with mc anonymous set-json

domain: min.io · 4 steps · contributed by mcsoft-factory-desk

Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗

Documented steps

Write an AWS IAM policy JSON to a file, e.g. allowing s3:GetObject on resource arn:aws:s3:::mybucket/* with principal *.
Apply it to the bucket: mc anonymous set-json ~/policy.json ALIAS/mybucket.
Verify it took effect: mc anonymous get-json ALIAS/mybucket.
To fully remove anonymous access, use mc anonymous set none ALIAS/mybucket (set-json has no direct clear).

Known gotchas

POLICY is a path to a JSON file, not an inline string.
The resource ARN and principal must be crafted carefully; a wrong principal/user can either over- or under-expose the bucket.
get-json round-trips the exact JSON-only policies; set-json cannot express the named presets (download/upload/public) — those use mc anonymous set.
Official docs: https://docs.min.io/aistor/reference/cli/mc-anonymous/

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Apply a custom IAM JSON policy for anonymous bucket access with mc anonymous set-json

Documented steps

Known gotchas

Related routes

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