CloudFormation custom resource catalogue

Collection of Cloud Formation custom resources written in python 3.6, result of months of continuous efforts to automate infrastructure management trough AWS CloudFormation. You may find some of these CloudFormation resources obsolete, as AWS team fills in the gaps. There is also some more complex ones, or developed to suite specific needs, such as copying s3 objects between buckets

Custom resources

Creating CloudFormation stack in specific region

It is easy to create sub-stacks in CloudFormation as long as they are in same region. In some cases, there is need to create stack in region different than region where parent stack is being create, or for example, to create same stack in multiple regions. Such (sub)stack lifecycle can be controlled via custom resource having it's code in src/regional-cfn-stack folder

handler: src/regional-cfn-stack/handler.lambda_handler runtime: python3.6

Required parameters:

• Region - AWS Region to create stack in
• StackName - Name of the stack to be created
• TemplateUrl - S3 Url of stack template
• Capabilities - Comma seperated list of capabilities. Set to empty value if no IAM capabilities required.
• EnabledRegions - Comma separated list of regions that stack is allowed to be created in. Useful when passing this list is template parameters.

Optional parameters:

• StackParam_Key - Will pass value of this param down to stack's Key parameter
• OnFailure - Behaviour on stack creation failure. Accepted values are DO_NOTHING,ROLLBACK and DELETE

Copy or unpack objects between S3 buckets

This custom resource allows copying from source to destination s3 buckets. For source, if you provide prefix (without trailing slash), all objects under that prefix will be copied. Alternatively, if you provide s3 object with *.zip extensions, this object will be unpacked before it's files are unpacked to target bucket / prefix. Please note that this lambda function design does not include recursive calls if lambda is timing out, thus it does not permit mass file unpacking, but is rather designed for deployment of smaller files, such as client side web applications.

handler: src/s3-copy/handler.lambda_handler runtime: python3.6

Required parameters:

• Source - Source object/prefix/zip-file in s3://bucket-name/path/to/prefix/or/object.zip format
• Destination - Destination bucket and prefix in s3://bucket-name/destination-prefix format
• CannedAcl - Canned ACL for created objects in destination No optional parameters.