Adding Tags to an Object

Tag Rules

OBS offers object tags for you to classify objects in buckets. You can tag an object when you upload it to a bucket or after it is stored in the bucket.

An object tag is a key-value pair. To use tags, follow the rules below:

An object can have up to 10 tags.
A tag key:
- Must be unique if there are multiple tags specified for an object.
- Can be 36 characters long at most and cannot contain the following special characters: ,/|<>=*\. It must be case sensitive and unique and cannot start or end with a space. It cannot be left blank.
A tag value:
Can be 255 characters long at most and cannot contain the following special characters: ,/|<>=*\. It must be case sensitive and cannot start or end with a space. It can be left blank.

Precautions

Object tags are now during open beta testing and can be used for free. Once the testing period is over, you will be billed for using them.
To read or write object tags, you must be the object owner or have required permissions. Such permissions can be granted using bucket policies.
During cross-region replication, tags of source objects are not copied.
Tags cannot be added to files in parallel file systems.
Currently, object tags cannot be used in IAM permissions or bucket policies.

Scenarios

Specifying object tags in a lifecycle rule

In a lifecycle configuration, you can specify filter conditions to identify the objects which the lifecycle rule applies to. A filter can be defined based on an object name prefix, an object tag, or both. For example, you can configure a lifecycle rule to delete objects with prefix texta/ and tag key1/value1 or key2/value2 120 days after their creation.

<LifecycleConfiguration>
    <Rule>
        <ID>sample-rule</ID>  
        <Filter>
            <And>
                <Prefix>texta/</Prefix>
                <Tag>
                    <Key>key1</Key>
                    <Value>value1</Value>
                </Tag>
                <Tag>
                    <Key>key2</Key>
                    <Value>value2</Value>
                </Tag>
            </And>
        </Filter>
        <Status>Enabled</Status>
        <Expiration>
            <Days>120</Days>
        </Expiration>
    </Rule>
</LifecycleConfiguration>

Ways to Configure Object Tags

You can use OBS Console or APIs to configure object tags.

Using OBS Console

On OBS Console, you can add tags to an object when uploading it (see uploading objects). You can also add tags to an existing object, as described in the following:

In the navigation pane of OBS Console, choose Object Storage.
In the bucket list, click the bucket you want to operate. The Objects page is displayed.
In the object list, click the name of the object you want to add tags to.
On the object details page, choose Tags > Add Tag.

In the Add Tag dialog box, enter a tag key and a tag value.

**Table 1** Parameters for configuring a tag
Parameter	Description
Tag key	Key of a tag, which must be unique and cannot be left blank. You can customize a tag or choose one predefined on TMS. A tag key: A tag key: Must be unique if there are multiple tags specified for an object. Can be 36 characters long at most and cannot contain the following special characters: *,/\|<>=\**. It must be case sensitive and unique and cannot start or end with a space. It cannot be left blank.
Tag value	Value of a tag, which can be repetitive or left blank. A tag value: A tag value: Can be 255 characters long at most and cannot contain the following special characters: *,/\|<>=\**. It must be case sensitive and cannot start or end with a space. It can be left blank.