Lambda And CloudFormation

Create a lambda function using CloudFormation

Inline

• Use Code.ZipFile property
• Cannot include function dependencies, suitable for short code

Through S3

• Store the lambda function zip in S3.
• Must provide
  • S3Bucket: name of the bucket
  • S3Key: full path to zip
  • S3ObjectVersion: if the bucket is versioned.
• Note: if you update the code in S3 but doesn't update S3Bucket, S3Key, or S3ObjectVersion.
  • CloudFormation won't update your function

For multiple account

• Use Execution Role in CloudFormation level or Bucket Policy in S3 level