Set a bucket-level default WORM object-lock retention policy with mc retention set --default
domain: min.io · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
The bucket MUST already have object locking enabled, which can only be done at creation: mc mb --with-lock ALIAS/bucket.
Set the bucket default retention mode and duration: mc retention set --default GOVERNANCE 30d ALIAS/bucket (MODE is governance or compliance; VALIDITY is Nd days or Ny years).
All objects uploaded afterward without an explicit lock inherit this default.
Verify with mc retention info --default ALIAS/bucket.
To remove the default, run mc retention clear --default ALIAS/bucket.
Known gotchas
Object locking must be enabled at bucket creation (mc mb --with-lock); it cannot be enabled on an existing bucket. As of RELEASE.2025-05-20T20-30-00Z MinIO also allows enabling lock on existing buckets, but the safe path is --with-lock at creation.
--default sets bucket-wide defaults and ignores all other retention flags when specified.
governance mode can be bypassed by users with s3:BypassGovernanceRetention; compliance cannot.
Buckets created without object locking cannot use lifecycle management.
Official docs: https://docs.min.io/aistor/reference/cli/mc-retention/ (set subcommand)
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