ubuntu1204-docker.json

{
  "_comment": "Build with `packer build -var-file=ubuntu1204-docker.json ubuntu.json`",
  "vm_name": "ubuntu1204-docker",
  "cpus": "1",
  "disk_size": "65536",
  "docker": "true",
  "iso_checksum": "7540ace2d6cdee264432f5ed987236d32edef798",
  "iso_checksum_type": "sha1",
  "iso_name": "ubuntu-12.04.5-server-amd64.iso",
  "iso_url": "http://releases.ubuntu.com/12.04/ubuntu-12.04.5-server-amd64.iso",
  "memory": "512",
  "preseed" : "preseed.cfg",
  "boot_command_prefix": "<esc><esc><enter><wait>"
}