centos6_64.json

{
    "provisioners": [
    {
      "type": "shell",
      "scripts": [
        "scripts/virtualbox.sh",
        "scripts/vagrant.sh"
      ],
      "override": {
        "virtualbox-iso": {
          "execute_command": "echo 'vagrant'|sudo -S sh '{{.Path}}'"
        }
      }
    }
  ],
    "variables": {
        "ssh_name": "vagrant",
        "ssh_pass": "vagrant",
        "hostname": "packerhost"
    },
  "builders": [{
    "type": "virtualbox-iso",
    "guest_os_type": "RedHat_64",
    "iso_url": "iso/CentOS-6.5-x86_64-bin-DVD1.iso",
    "iso_checksum": "83221db52687c7b857e65bfe60787838",
    "iso_checksum_type": "md5",
    "ssh_username": "{{user `ssh_name`}}",
    "ssh_password": "{{user `ssh_pass`}}",
    "guest_additions_path": "VBoxGuestAdditions_4.3.6.iso",
    "ssh_wait_timeout": "90m",
    "http_directory" : "http",
    "ssh_port": 22,
    "boot_command": [
    "<tab> text ks=http://{{ .HTTPIP }}:{{ .HTTPPort }}/cfg_centos/ks.cfg<enter><wait>"
    ],
    "shutdown_command": "echo {{user `ssh_pass`}} | sudo -S shutdown -P now",
    "vboxmanage": [
    ["modifyvm","{{.Name}}","--memory","4800"],
    ["modifyvm","{{.Name}}","--cpus", "2"]
    ]
    }],
    "post-processors" : [
    {
    "type": "vagrant",
    "keep_input_artifact": false,
    "output": "centos6_64_{{.Provider}}.box"
    }
    ]
}