AWS CloudFormation does not support referencing "the latest version" of a layer when creating a Lambda function. This becomes problematic when the layer was created outside of your CloudFormation template.
CFNAttachLambdaLayer allows you to specify a Lambda and the Layer name that will be attached to it. It will attach the latest version of the Layer to the specified Lambda.
- The AWS CLI
- The AWS Serverless Application Model must be installed
- Python 3.7
From the command line, run:
sam build -t ./cfn_attach_lambda_layer.yml
sam deploy --template-file .aws-sam/build/template.yaml --stack-name cfn-attach-lambda-layer --capabilities "CAPABILITY_NAMED_IAM" --resolve-s3 --parameter-overrides Nonce="$(date +%s)" This will deploy an AWS Lambda custom resource that can be called by your CloudFormation template.
Parameters:
Nonce:
Type: String
Description: Forces custom resource to run everytime CF runs -- pass in a $RANDOM as a parameter
AttachLayer:
Type: Custom::LayerAttachment
Properties:
LayerName: <Your Layer name>
LambdaName: <Lambda name or ARN>
#CloudFormation will not execute the custom resource if no properties are changed.
#Along with the parameter, this ensures that the resource is called each time CloudFormation runs
Nonce: !Ref Nonce
ServiceToken: !ImportValue CFNAttachLambdaLayer
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