Functions

Cross-region replication refers to the automatic and asynchronous replication of objects across buckets in different regions. By activating the cross-region replication function, OBS can copy new objects and modified objects from a source bucket to destination buckets in different regions.

The following two requirements must be met when configuring the cross-region replication for a bucket:

Cross-region replication can be configured only when the versioning statuses of the source and destination buckets are the same. For details about how to configure bucket versioning, see Configuring Versioning for a Bucket.
The owner and agency (OBS) of the source bucket must have the permission to write the destination bucket (configured with BucketPolicy), and the agency (OBS) must have the read permission for the source bucket. This permission delegation needs to be implemented by calling the BucketPolicy API.

For details about how to configure the bucket policy, see Configuring a Bucket Policy. After the bucket policy is set, the agency (OBS) can read objects from the source bucket and copy objects to the destination bucket.

Request Syntax

PUT /?replication HTTP/1.1 
Host: bucketname.obs.region.example.com
x-obs-date: date 
Content-MD5: MD5
Authorization: authorization string 
Content-Length: contentlength 

<ReplicationConfiguration> 
    <Agency>testAcy</Agency>
    <Rule> 
        <ID>rule1</ID> 
        <Prefix>key-prefix</Prefix> 
        <Status>rule-status</Status> 
        <Destination> 
            <Bucket>targetbucketname</Bucket> 
            <StorageClass>STANDARD</StorageClass>
            <DeleteData>Enabled</DeleteData>
        </Destination> 
        <HistoricalObjectReplication>Enabled</HistoricalObjectReplication>
    </Rule> 
</ReplicationConfiguration>

Request Parameters

This request contains no message parameters.

Request Headers

The request uses one header, as described in the following table.

**Table 1** Request header for cross-region replication
Element	Description	Mandatory
Content-MD5	Base64-encoded 128-bit MD5 digest of the message according to RFC 1864.	Yes

Request Elements

This request contains elements to specify the replication configuration for the bucket in XML format. The following table lists request elements:

**Table 2** Bucket replication configuration elements
Element	Description	Mandatory
ReplicationConfiguration	Container for the replication rules. A maximum of 100 rules can be configured. The size of the XML file can reach 50 KB. Type: container Children: Rule Ancestor: none	Yes
Agency	Name of the agency, which can have a maximum of 64 characters. Type: string Ancestor: ReplicationConfiguration	Yes
Rule	Container of a specified replication rule. The replication configuration must contain at least one rule. The maximum number of rules is 100. Type: container Ancestor: ReplicationConfiguration	Yes
ID	Unique identifier of a rule, with a maximum length of 255 characters. Type: string Ancestor: Rule	No
Status	If the value of this element is Disabled, this rule will be ignored. Type: string Ancestor: Rule Value options: Enabled, Disabled	Yes
Prefix	Prefix of an object key name, applicable to one or more objects. If the Prefix is left blank, the cross-region replication rule is applied to the whole bucket. The maximum length of a prefix is 1024 characters. Duplicated prefixes are not supported. Type: string Ancestor: Rule	Yes
Destination	Container for the destination bucket information. Type: container Ancestor: Rule	Yes
Bucket	Bucket used to store object copies that are marked by rules. If the replication configuration contains multiple rules, the rules must specify the same bucket as the destination bucket. Type: string Ancestor: Destination	Yes
StorageClass	Storage class of an object Type: string Ancestor: Destination Value options: STANDARD, WARM, COLD	No
DeleteData	Keyword for synchronizing object deletion operations. If the value is Enabled, the object deletion for the source bucket will be replicated to the destination bucket. Type: string Ancestor: Destination Value options: Enabled and Disabled (If this element is absent from the request, Disabled is applied by default.)	No
HistoricalObjectReplication	Keyword for copying a historical object. If the value is Enabled, historical objects meeting this rule are copied. Type: string Ancestor: Rule Value options: Enabled and Disabled (If this element is absent from the request, Disabled is applied by default.)	No

Response Syntax

HTTP/1.1 status_code 
Server: OBS 
Date:date 
Content-Length: contentlength

Response Headers

The response to the request uses common headers. For details, see Table 1.

Response Elements

This response involves no elements.

Error Responses

No special error responses are returned for this request.

Sample Request

PUT /?replication HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.example.com
Accept: */*
Date: Wed, 27 Jun 2018 13:39:15 +0000
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:CdeqU0Vg9xNdJMZ0PGPgh5EnkO0=
Content-MD5: l/Z8mfSX+VyV8k5EhIQz5Q==
Content-Length: 330

<ReplicationConfiguration>
   <Agency>testAcy</Agency>
   <Rule>
       <ID>Rule-1</ID>
       <Status>Enabled</Status>
       <Prefix></Prefix>
       <Destination>
          <Bucket>dstbucket</Bucket>
          <StorageClass>STANDARD</StorageClass>
          <DeleteData>Enabled</DeleteData>
       </Destination>      
       <HistoricalObjectReplication>Enabled</HistoricalObjectReplication>
     </Rule>
</ReplicationConfiguration>

Sample Response

HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: B59500000164417839932E5A2295674C
x-obs-id-2: 32AAAQAAEAABKAAQAAEAABAAAQAAEAABCStv51t2NMMx+Ou+ow7IWV4Sxo231fKe
Date: Wed, 27 Jun 2018 13:39:15 GMT
Content-Length: 0

Configuring Cross-Region Replication for a Bucket