Bucket Overview

A bucket is a container for storing objects in OBS. OBS offers a flat structure based on buckets and objects. This structure enables all objects to be stored at the same logical layer, rather than being stored hierarchically.

Each bucket has its own attributes, such as storage class, access permissions, and region. You can create buckets with different storage classes and access permissions in different regions and configure advanced attributes to meet storage requirements for different scenarios.

OBS provides the Standard, Infrequent Access, and Archive storage classes. These storage classes meet different requirements for storage performance and cost. When creating a bucket, you can specify a storage class for the bucket, which can be changed later.

On OBS, each bucket name must be unique and cannot be changed. The region where a bucket resides cannot be changed once the bucket is created. When a bucket is created, OBS creates a default access control list (ACL) for it. A bucket ACL defines which users are granted access and the type of access, such as read and write permissions. A user can perform operations on a bucket only if they have the required permissions.

An account (and all its IAM users) can create a maximum of 100 buckets. You can use the fine-grained access control of OBS to properly plan and use buckets. For example, you can create folders in a bucket by object prefix and use fine-grained permissions control to isolate access to folders between departments. There is no limit on the number and total size of objects in a bucket.

As OBS is based on a RESTful architecture over HTTP and HTTPS, you can use uniform resource locators (URLs) to locate resources.

Figure 1 illustrates the relationship between buckets and objects in OBS.

Figure 1 Buckets and objects

You can use different methods to create buckets based on your use habits and storage needs. After a bucket is created, you can upload files (data) to the bucket in a way you like. OBS stores these files as objects. In OBS, buckets and objects are located in different regions, but you can access the same bucket and its resources in a region regardless of the method you choose to access OBS.