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This addresses use of auto-scaling ODM with the AWS cloud provider. There were 4, docker-machine parameters for the amazonec2 driver that were added to the aws.js config specification including vpc, subnet, iamrole, and zone. Each of these is checked for a value other than an empty string and added to the docker-machine args that are generated. VPC/Subnet are required unless a user has a default VPC/Subnet defined. IAMRole is required to provide ec2 and s3 priv's to the docker-machine instance created as iamrole is not carried forward by the AMI at instance creation. Zone is required in order to build the machine in the same zone as the VPC/Subnet specified.