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DependsOn Attribute In AWS CloudFormation

This article describes DependsOn attribute in AWS CloudFormation.

Purpose

In AWS CloudFormation, the DependsOn attribute explicitly specifies the resource creation order. This ensures that one resource is created before another.

Create A YAML File

Create the YAML file with the following code.

AWSTemplateFormatVersion: "2010-09-09"
Resources:
  MyS3Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: my-depends-on-example-bucket-gyansangrah

  MyLambdaFunction:
    Type: AWS::Lambda::Function
    DependsOn: MyS3Bucket
    Properties:
      FunctionName: MyExampleLambda
      Handler: index.handler
      Role: arn:aws:iam::[account_id]:role/Lambdarole
      Runtime: python3.9
      Code:
        ZipFile: |
          def handler(event, context):
              print("Lambda executed")

In the above code, replace account_id with your account id.

Create A Stack

Create a CloudFormation stack with the above YAML file. The first resource i.e., S3 bucket will be created followed by the lambda function.

Picture showing the S3 bucket created followed by the lambda function

Output

Picture showing the S3 bucket created using the cloudformation

Picture showing the lambda function created using the cloudformation

Posted By -	Karan Gupta

Posted On -	Monday, February 24, 2025

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