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S3 Implement Replication #689

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docs(s3): add S3 Replication documentation
blkgrlcto Jun 3, 2026
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docs(s3): add metadata replication support to S3 Replication section
blkgrlcto Jun 3, 2026
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docs(s3): add IAM enforcement documentation to S3 Replication section
blkgrlcto Jun 3, 2026
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blkgrlcto Jun 25, 2026
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43 changes: 43 additions & 0 deletions src/content/docs/aws/services/s3.mdx
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Expand Up @@ -260,6 +260,49 @@ LocalStack supports SSE-C parameter validation for the following S3 APIs:

However, LocalStack does not support the actual encryption and decryption of objects using SSE-C.

## S3 Replication

S3 Replication allows you to automatically copy objects from a source bucket to one or more destination buckets.
Replication can occur within the same region or across regions, and across different accounts.

LocalStack supports the following replication configurations:

- **One-way replication**: Objects are replicated from a source bucket to a destination bucket. You can scope replication using prefix-based or tag-based filtering, and optionally override the storage class for objects written to the destination bucket.
- **Two-way replication**: Both buckets are configured as source and destination for each other, and replication is configured to work in both directions.

### IAM enforcement

LocalStack supports IAM enforcement for S3 replication.
IAM permissions are evaluated in the context of each replication task using the IAM engine directly, which mirrors how AWS itself handles replication permissions.

### Metadata replication
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LocalStack supports replication of object metadata — specifically tags and Object Lock settings. Metadata replication operates in two modes:
LocalStack supports replication of object metadata, specifically tags and Object Lock settings. Metadata replication operates in two modes:
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@bentsku bentsku Jun 30, 2026

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note: there are 2 duplicate lines here


- **Default metadata replication**: When a source object's metadata is modified, those changes are automatically propagated to all of its replicas. This behavior is enabled by default and requires no additional configuration.
- **Replica metadata synchronization**: When enabled on the destination bucket, metadata changes made directly to a replica are synced back to the source object. This applies only when two-way replication is configured. See [Replication for metadata changes](https://docs.aws.amazon.com/AmazonS3/latest/userguide/replication-for-metadata-changes.html) in the AWS documentation for more details.

### ReplicationStatus

Replicated objects are assigned a `ReplicationStatus` field, which you can inspect with `GetObject` or `HeadObject`.
The possible values follow AWS semantics:

| Status | Meaning |
|---|---|
| `PENDING` | Replication has been queued but not yet completed |
| `COMPLETED` | Object was successfully replicated to the destination |
| `FAILED` | Replication could not be completed |
| `REPLICA` | This object is itself a copy created by replication |

:::note
The following replication features are not yet supported in LocalStack and will be available in a future release:

- **`s3:ReplicateTags` deny evaluation**: Explicitly denying `s3:ReplicateTags` will not cause replication to be denied if the object has tags.
- **KMS-encrypted object replication**: Objects encrypted with customer-provided KMS keys are not replicated, even when replication of KMS-encrypted objects is explicitly configured. See [Replicating objects created with server-side encryption using AWS KMS keys](https://docs.aws.amazon.com/AmazonS3/latest/userguide/replication-config-for-kms-objects.html#replications) in the AWS documentation for more details.
- **ACL replication**: Replication of Access Control Lists is not currently supported.
:::

## Resource Browser

The LocalStack Web Application provides a [Resource Browser](/aws/connecting/console/resource-browser) for managing S3 buckets & configurations.
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