To create a Lambda layer version

The following publish-layer-version example creates a new Python library layer version. The command retrieves the layer content a file named layer.zip in the specified S3 bucket.

aws lambda publish-layer-version \
    --layer-name my-layer \
    --description "My Python layer" \
    --license-info "MIT" \
    --content S3Bucket=lambda-layers-us-west-2-123456789012,S3Key=layer.zip \
    --compatible-runtimes python3.6 python3.7

Output:

{
    "Content": {
        "Location": "https://awslambda-us-west-2-layers.s3.us-west-2.amazonaws.com/snapshots/123456789012/my-layer-4aaa2fbb-ff77-4b0a-ad92-5b78a716a96a?versionId=27iWyA73cCAYqyH...",
        "CodeSha256": "tv9jJO+rPbXUUXuRKi7CwHzKtLDkDRJLB3cC3Z/ouXo=",
        "CodeSize": 169
    },
    "LayerArn": "arn:aws:lambda:us-west-2:123456789012:layer:my-layer",
    "LayerVersionArn": "arn:aws:lambda:us-west-2:123456789012:layer:my-layer:1",
    "Description": "My Python layer",
    "CreatedDate": "2018-11-14T23:03:52.894+0000",
    "Version": 1,
    "LicenseInfo": "MIT",
    "CompatibleRuntimes": [
        "python3.6",
        "python3.7"
    ]
}

For more information, see AWS Lambda Layers in the AWS Lambda Developer Guide.