get-download-url-for-layer¶

Description¶

Retrieves the pre-signed Amazon S3 download URL corresponding to an image layer. You can only get URLs for image layers that are referenced in an image.

When an image is pulled, the GetDownloadUrlForLayer API is called once per image layer that is not already cached.

Note

This operation is used by the Amazon ECR proxy and is not generally used by customers for pulling and pushing images. In most cases, you should use the docker CLI to pull, tag, and push images.

Synopsis¶

  get-download-url-for-layer
[--registry-id <value>]
--repository-name <value>
--layer-digest <value>
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]

Options¶

--registry-id (string)

The Amazon Web Services account ID associated with the registry that contains the image layer to download. If you do not specify a registry, the default registry is assumed.

--repository-name (string)

The name of the repository that is associated with the image layer to download.

--layer-digest (string)

The digest of the image layer to download.

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command. The generated JSON skeleton is not stable between versions of the AWS CLI and there are no backwards compatibility guarantees in the JSON skeleton generated.

See ‘aws help’ for descriptions of global parameters.

Examples¶

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal’s quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To get the download URL of a layer

The following get-download-url-for-layer example displays the download URL of a layer with the digest sha256:6171c7451a50945f8ddd72f7732cc04d7a0d1f48138a426b2e64387fdeb834ed in the cluster-autoscaler repository.

aws ecr get-download-url-for-layer \
    --repository-name cluster-autoscaler  \
    --layer-digest sha256:6171c7451a50945f8ddd72f7732cc04d7a0d1f48138a426b2e64387fdeb834ed

Output:

{
    "downloadUrl": "https://prod-us-west-2-starport-layer-bucket.s3.us-west-2.amazonaws.com/e501-012345678910-9cb60dc0-7284-5643-3987-da6dac0465f0/04620aac-66a5-4167-8232-55ee7ef6d565?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20190814T220617Z&X-Amz-SignedHeaders=host&X-Amz-Expires=3600&X-Amz-Credential=AKIA32P3D2JDNMVAJLGF%2F20190814%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Signature=9161345894947a1672467a0da7a1550f2f7157318312fe4941b59976239c3337",
    "layerDigest": "sha256:6171c7451a50945f8ddd72f7732cc04d7a0d1f48138a426b2e64387fdeb834ed"
}

Output¶

downloadUrl -> (string)

The pre-signed Amazon S3 download URL for the requested layer.

layerDigest -> (string)

The digest of the image layer to download.

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