Is it possible to trigger a lambda on creation from CloudFormation template

by

Yes, it is possible. Here are a few options:

  1. Manually create an SNS Topic. Add an AWS::SNS::Subscription to your stack with the lambda function as the Endpoint and the SNS topic as the TopicArn. On stack creation/update, configure Stack Event Notifications to be sent to this SNS topic.

    • (See Setting AWS CloudFormation Stack Options for documentation on how to do this when using the AWS Console to create your stack, or use the equivalent option like --notification-arns if creating/updating your stack using the AWS CLI or other AWS SDK.)

  2. Add a Custom Resource referencing a Lambda function to be called on creation.

    • If you need the Lambda function to be called after some specific Resource is created, add a DependsOn attribute on the Custom Resource referencing the Resource you want to make sure is created first before the function is called.
    • In order for the Custom Resource to create successfully (and not cause a failure/rollback in your stack), you will need to adapt your Lambda function to support the CloudFormation request/response format (see Custom Resource Reference).
    • This option will call the Lambda function while the stack status is still CREATE_IN_PROGRESS, because the Custom Resource is part of the stack itself.
    • The Lambda function will also be called again when the stack (and associated Custom Resource) is deleted. This will need to be handled by your Lambda function correctly, or your stack could get stuck in the DELETE_FAILED state.

  3. Add the Lambda function reference to a Stack Output, then write a simple script that performs the stack creation and then manually invokes the Lambda function afterwards.

More Related Contents:

  1. How to pass a querystring or route parameter to AWS Lambda from Amazon API Gateway
  2. API Gateway – POST multipart/form-data
  3. AWS lambda invoke not calling another lambda function – Node.js
  4. Using moviepy, scipy and numpy in amazon lambda
  5. Nodejs – Invoke an AWS.Lambda function from within another lambda function
  6. Use AWS Glue Python with NumPy and Pandas Python Packages
  7. Why can’t an AWS lambda function inside a public subnet in a VPC connect to the internet?
  8. How to fetch/scan all items from `AWS dynamodb` using node.js
  9. Using psycopg2 with Lambda to Update Redshift (Python)
  10. “invalid ELF header” when using the nodejs “ref” module on AWS Lambda
  11. Cannot use Requests-Module on AWS Lambda
  12. Allow AWS Lambda to access RDS Database
  13. AWS Lambda: How to set up a NAT gateway for a lambda function with VPC access
  14. Formatting DynamoDB data to normal JSON in AWS Lambda
  15. Pandas in AWS lambda gives numpy error
  16. How to access HTTP headers for request to AWS API Gateway using Lambda?
  17. Why is this HTTP request not working on AWS Lambda?
  18. Download an already uploaded Lambda function
  19. Access AWS S3 from Lambda within VPC
  20. AWS Lambda NoClassDefFoundError
  21. How to load npm modules in AWS Lambda?
  22. Can you publish a message to an SNS topic using an AWS Lambda function backed by node.js?
  23. Setting http response header from AWS lambda
  24. Pandas & AWS Lambda
  25. AWS error from Python: No module named lambda_function
  26. AWS Lambda Error: Unzipped size must be smaller than 262144000 bytes
  27. Getting error AWS Lambda : EROFS: read-only file system, open ‘/var/task/assets/docs.zip’
  28. How can I retrieve a user’s public IP address via Amazon API Gateway + Lambda (node)
  29. Can bash script be written inside a AWS Lambda function
  30. AWS Lambda connecting to Internet

Leave a Comment