{

"name": "Docker",
"versions": [{
    "major_version": "14",
    "minor_version": "04",
    "codename": "trusty",
    "name": "Trusty Tahr",
    "iso_url": "http://archive.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/current/images/netboot/mini.iso",
    "iso_checksum": "bc09966b54f91f62c3c41fc14b76f2baa4cce48595ce22e8c9f24ab21ac8d965"
  }],
"boot_command": "install auto=true priority=critical preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}",
"qemu": {
  "accelerator": "kvm",
  "qemuargs": [ [ "-m", "1024M" ] ]
},
"virtualbox": {
  "guest_os_type": "Ubuntu_64",
  "vboxmanage": [ ["modifyvm", "{{.Name}}", "--memory", "1024"] ],
  "guest_additions_mode": "disable"
}

}