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# Azure Blob Storage cache storage
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> **Warning**
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>
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> This cache backend is unreleased. You can use it today, by using the
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> `moby/buildkit:master` image in your Buildx driver.
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The `azblob` cache store uploads your resulting build cache to
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[Azure's blob storage service](https://azure.microsoft.com/en-us/services/storage/blobs/).
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> **Note**
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>
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> This cache storage backend requires using a different driver than the default
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> `docker` driver - see more information on selecting a driver
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> [here](../drivers/index.md). To create a new driver (which can act as a simple
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> drop-in replacement):
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>
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> ```console
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> docker buildx create --use --driver=docker-container
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> ```
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## Synopsis
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```console
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$ docker buildx build . --push -t <registry>/<image> \
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--cache-to type=azblob,name=<cache-image>[,parameters...] \
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--cache-from type=azblob,name=<cache-image>[,parameters...]
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```
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The following table describes the available CSV parameters that you can pass to
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`--cache-to` and `--cache-from`.
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| Parameter | Option | Value | Default | Description |
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| ------------------- | ---------- | ---------- | ------- | -------------------------------------------------- |
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| `name` | Both | String | | Required. The name of the cache image. |
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| `account_url` | Both | String | | Base URL of the storage account. |
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| `secret_access_key` | Both | String | | Blob storage account key, see [authentication][1]. |
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| `mode` | `cache-to` | `min\|max` | `min` | Cache layers to export, see [cache mode][2]. |
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[1]: #authentication
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[2]: index.md#cache-mode
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## Authentication
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The `secret_access_key`, if left unspecified, is read from environment variables
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on the BuildKit server following the scheme for the
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[Azure Go SDK](https://docs.microsoft.com/en-us/azure/developer/go/azure-sdk-authentication).
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The environment variables are read from the server, not the Buildx client.
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## Further reading
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For an introduction to caching see
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[Optimizing builds with cache management](https://docs.docker.com/build/building/cache).
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For more information on the `azblob` cache backend, see the
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[BuildKit README](https://github.com/moby/buildkit#azure-blob-storage-cache-experimental).
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