#examples from Amazon documentation
aws_key_location:      ~/.ssh #or whereever you store you aws keys - no trailing slash
ec2_private_key:       pk-HKZYKTAIG2ECMXYIBH3HXV4ZBZQ55CLO.pem
ec2_x509_cert:         cert-HKZYKTAIG2ECMXYIBH3HXV4ZBZQ55CLO.pem
aws_account_id:        495219933132
ec2_architecture:      i386 #or x86_64
aws_access_key:        <aws-access-key-id>
aws_secret_access_key: <aws-secret-access-key>
ec2_s3_bucket_name:    some_bucket_for_your_ami_images
ami_excluded_items:    [] #you may want to exclude files or directories like /home/my_user, etc.