At the moment the blog IMO assumes that the user running the example either has all the IAM roles figured out or is a root user.
This leads to the script failing multiple times. The README or the wiki can be updated to add the required permissions for running the demo.

In the script create_cfn_stack.py the create_bucket function fails for certain regions with the following error:

A client error (IllegalLocationConstraintException) occurred when calling the CreateBucket operation: The unspecified location constraint is incompatible for the region specific endpoint this request was sent to.

Upon searching a bit I landed on this issue aws/aws-cli#2603

For now I have mitigated the issue by modifying the code for my region and adding the LocationConstraint

def create_bucket(bucket_name):
    """Create an S3 bucket in a specified region

    :param bucket_name: Bucket to create
    :return: True if bucket created, else False
    """

    try:
        s3_client.create_bucket(
            Bucket=bucket_name,
            CreateBucketConfiguration={'LocationConstraint': 'ap-southeast-1'}
        )
        logging.info(f'New bucket name: {bucket_name}')
    except ClientError as e:
        logging.info('An error occurred !!', bucket_name)
        logging.error(e)
        return False
    return True

However I think the script can be modified to accommodate for this so it doesn't fail.

Hey Gary,

how can I correct this error
Cluster: demo-cluster-CloudFormation Resolved with errors The given SSH key name was invalid

output: ERROR - An error occurred (ParameterAlreadyExists) when calling the PutParameter operation: The parameter already exists. To overwrite this value, set the overwrite option in the request to true.

do you have an idea?