Example of EC2 lookup as datasource

data "aws_ami" "coreos_etcd" {
  most_recent = true

  owners = ["${var.ownerid}"]

  filter {
    name   = "architecture"
    values = ["x86_64"]
  }

  filter {
    name   = "root-device-type"
    values = ["ebs"]
  }

  filter {
    name   = "virtualization-type"
    values = ["${var.virtualization_type}"]
  }

  filter {
    name   = "name"
    values = ["${var.ami_name}-${var.channel}-*"]
  }
}