An implementation of the `storagedriver.StorageDriver` interface which uses [Microsoft Azure Blob Storage](https://azure.microsoft.com/en-us/services/storage/) for object storage.
| `accountname` | yes | Name of the Azure Storage Account. |
| `accountkey` | yes | Primary or Secondary Key for the Storage Account. |
| `container` | yes | Name of the Azure root storage container in which all registry data is stored. Must comply the storage container name [requirements](https://docs.microsoft.com/rest/api/storageservices/fileservices/naming-and-referencing-containers--blobs--and-metadata). For example, if your url is `https://myaccount.blob.core.windows.net/myblob` use the container value of `myblob`.|
| `realm` | no | Domain name suffix for the Storage Service API endpoint. For example realm for "Azure in China" would be `core.chinacloudapi.cn` and realm for "Azure Government" would be `core.usgovcloudapi.net`. By default, this is `core.windows.net`. |
| `copy_status_poll_max_retry` | no | Max retry number for polling of copy operation status. Retries use a simple backoff algorithm where each retry number is multiplied by `copy_status_poll_delay`, and this number is used as the delay. Set to -1 to disable retries and abort if the copy does not complete immediately. Defaults to 5. |
| `copy_status_poll_delay` | no | Time to wait between retries for polling of copy operation status. This time is multiplied by N on each retry, where N is the retry number. Defaults to 100ms |
* You can use Microsoft's [Blob Service REST API](https://docs.microsoft.com/en-us/rest/api/storageservices/Blob-Service-REST-API) to [create a storage container](https://docs.microsoft.com/en-us/rest/api/storageservices/Create-Container).
