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Object Storage

Object Storage

OpenStack supports object storage based on OpenStack Swift. Creation of an object storage container (database) is done by clicking on +Container on Object storage containers page.

Every object typically contains data along with metadata and a unique global identifier to access it. OpenStack allows you to upload your files via an HTTPS protocol. There are two ways of managing a created object storage container:

  1. Use OpenStack component Swift

  2. Use S3 API

In both cases, you will need application credentials to be able to manage your data.

Swift Credentials

The easiest way to generate Swift storage credentials is through MetaCentrum cloud dashboard. You can generate application credentials as described in the Obtaining API Key section. You must have the heat_stack_owner role.

S3 Credentials

If you want to use S3 API you will need to generate ec2 credentials for access. Note that to generate ec2 credentials you will also need credentials containing the role of heat_stack_owner. Once you sourced your credentials for CLI, you can generate ec2 credentials:

$ openstack ec2 credentials create          
| Field      | Value                                                            |
| access     | 896**************************651                                 |
| project_id | f0c**************************508                                 |
| secret     | 336**************************49c                                 |
| user_id    | e65***********************************************************6a |

Then you may use one of the s3 clients (minio client mc, s3cmd, ...) Running minio client against created object storage container is very easy:

$ MC config host add swift-s3  896**************************651 336**************************49c --api S3v2
Added `swift-s3` successfully.

$ MC ls swift-s3
[2021-04-19 15:13:45 CEST]     0B freznicek-test/

s3cmd client requires a configuration file that looks like this: In this case please open your file with credentials that will look like this:

access_key = 896**************************651
secret_key = 336**************************49c
host_base =
host_bucket =
use_https = True

For more information, please refer to and

Last update: March 30, 2023