Setting Up an S3 Trigger for an AWS Lambda Function in the AWS Clouformation

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Abhay Singh
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To set up an AWS Lambda function, an Amazon S3 bucket, and an S3 trigger for the function using AWS CloudFormation, you can use the AWS::Lambda::Function, AWS::S3::Bucket, and AWS::Lambda::EventSourceMapping resources. Here is an example of how you might use these resources in a CloudFormation template:

AWSTemplateFormatVersion: "2010-09-09" Description: "Create Lambda S3 triggger"

Parameters: MyBucketName: Description: S3 Bucket Name Type: String Default: abhaysingh091290

Resources: MyIAMRole: Type: AWS::IAM::Role Properties: AssumeRolePolicyDocument: Version: 2012-10-17 Statement:

  • Effect: Allow Principal: Service:
    • lambda.amazonaws.com Action:
      • sts:AssumeRole Policies:
      • PolicyName: MyPolicy PolicyDocument: Version: 2012-10-17 Statement:
      • Effect: Allow Action:
      • s3:ListBucket Resource: arn:aws:s3:::${MyBucketName} LambdaPermission: Type: AWS::Lambda::Permission Properties: Action: 'lambda:InvokeFunction' FunctionName: !Ref MyFunction Principal: s3.amazonaws.com SourceArn: !Sub 'arn:aws:s3:::${MyBucketName}' SourceAccount: !Ref AWS::AccountId MyFunction: Type: AWS::Lambda::Function Properties: Code: ZipFile: | def handler(event, context): return "Hello, World!" Handler: index.handler Role: !GetAtt MyIAMRole.Arn Runtime: python3.8 Timeout: 30 MyBucket: Type: AWS::S3::Bucket Properties: BucketName: !Ref MyBucketName NotificationConfiguration: LambdaConfigurations:
  • Event: s3:ObjectCreated:* Function: !GetAtt MyFunction.Arn Filter: S3Key: Rules:
    • Name: Suffix Value: ".txt"
    • Name: Prefix Value: "test-"

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