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CloudFormationでLambdaのLayerを作成する

Last updated at Posted at 2019-02-05

準備

ライブラリを作成し、ディレクトリ構成は以下のようにします。

layer.zip
│ python/lib
└ python/yourlib

zipファイルにして、S3にアップロード

.sh
zip -r layer.zip python
aws s3 cp ./layer.zip s3://yourbucket

CloudFormation template sample

lambdalayer.yaml
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Resources:
#Layer作成
  LambdaLayer:
    Type: "AWS::Lambda::LayerVersion"
    Properties:
      CompatibleRuntimes: 
        - python3.6 #Valid Values: nodejs6.10 | nodejs8.10 | java8 | python2.7 | python3.6 | python3.7 | dotnetcore1.0 | dotnetcore2.0 | dotnetcore2.1 | go1.x | ruby2.5 
      Content: 
        S3Bucket: your-bucket
        S3Key: layer.zip    #Layer File
      Description: something
      LayerName: yourlayername

#LambdaSAM
  Lambda:
    Type: 'AWS::Serverless::Function'
    Properties:
      Handler: lambda_function.lambda_handler
      Runtime: python3.6
      MemorySize: 128
      Timeout: 20
      Role: !Sub 'arn:aws:iam::${AWS::AccountId}:role/lambda-common-role'
      CodeUri: src/lambdasrcc/
      Layers:
        - !Ref LambdaLayer

注意

Layerのサイズ制限は以下になります。

リソース 制限
サイズ 50 MB (圧縮)
250 MB(解凍)
解凍の場合、既存ソースと合わせて250 MB以下です。
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