# 与层结合使用 AWS SAM
<a name="layers-sam"></a>

您可以使用 AWS Serverless Application Model（AWS SAM）自动在应用程序中创建层。`AWS::Serverless::LayerVersion` 资源类型创建一个层版本，您可以从自己的 Lambda 函数配置中引用该版本。

```
AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: AWS SAM Template for Lambda Function with Lambda Layer

Resources:
  MyLambdaLayer:
    Type: AWS::Serverless::LayerVersion
    Properties:
      LayerName: my-lambda-layer
      Description: My Lambda Layer
      ContentUri: s3://amzn-s3-demo-bucket/my-layer.zip
      CompatibleRuntimes:
        - python3.9
        - python3.10
        - python3.11

  MyLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: MyLambdaFunction
      Runtime: python3.9
      Handler: app.handler
      CodeUri: s3://amzn-s3-demo-bucket/my-function
      Layers:
        - !Ref MyLambdaLayer
```