packer/vars/centos-7.json

{
  "source_ami_filter_name": "*CentOS Linux 7*HVM*",
  "source_ami_filter_owner": "679593333241",
  "ssh_user": "centos",

  "distro": "CentOS 7",
  "arch": "x86_64",
  "cloud_user_data": "provision/rh-user_data.sh"
}