packer.json

{
   "_comment": "
      A common CentOS build process is to netboot a bare minimum OS and use that as a base to build on. This minimum kernel is booted and runs the 'minecraft.ks' kickstart file. A kickstart file contains answers to all the questions that would normally be asked during a CentOS installation. Our kickstart file is very minimal since we do as much of the system configuration in puppet as we can.
      Packer automatically starts a http server in this directory that we can access via the special variables .HTTPIP and .HTTPPort. That's how the kickstart file is served. 
      The amazon-ebs builder logs in to AWS for you and boots up a machine to create the AMI for you. So you have to pay for 1 hour of that instance running (currently a whopping $0.0065 for t2.nano).
   ",
   "builders": [{
      "type": "amazon-ebs",
      "name": "aws",
      "access_key": "{{env `aws_access_key`}},
      "secret_key": "{{env `aws_secret_key`}},
      "region": "us-east-1",
      "source_ami": "ami-72b9e018",
      "instance_type": "t2.nano",
      "ssh_username": "ubuntu",
      "ami_name": "aws-minecraft {{timestamp}}"
   }, {
      "type": "virtualbox-iso",
      "name": "vagrant",
      "guest_os_type": "RedHat_64",
      "iso_urls": [
         "http://mirror.clarkson.edu/centos/7/isos/x86_64/CentOS-7-x86_64-NetInstall-1503.iso",
         "http://mirrors.xmission.com/centos/7/isos/x86_64/CentOS-7-x86_64-NetInstall-1503.iso",
         "http://ftp.riken.jp/Linux/centos/7/isos/x86_64/CentOS-7-x86_64-NetInstall-1511.iso",
         "http://repos.mia.quadranet.com/centos/7/isos/x86_64/CentOS-7-x86_64-NetInstall-1503.iso"
      ],
      "iso_checksum_type": "sha256",
      "iso_checksum": "9ed9ffb5d89ab8cca834afce354daa70a21dcb410f58287d6316259ff89758f5",
      "ssh_username": "vagrant",
      "ssh_password": "vagrant",
      "shutdown_command": "echo 'vagrant' | sudo /sbin/halt -h -p",
      "vboxmanage": [
        [
          "modifyvm",
          "{{.Name}}",
          "--memory",
          "2048"
        ],
        [
          "modifyvm",
          "{{.Name}}",
          "--cpus",
          "2"
        ]
      ],
      "disk_size": "8000",
      "headless": false
   }],
   "provisioners": [{
   }],
   "post-processors": [{
      "type": "vagrant",
      "only": ["virtualbox-iso"],
      "output": "aws-minecraft.box"
   }]
}