template.json

{
    "variables": {
      "ssh_username": "vagrant",
      "ssh_password": "vagrant",
      "iso_checksum": "401c5f6666fe2879ac3a9a3247b487723410cf88",
      "iso_url": "http://releases.ubuntu.com/14.04/ubuntu-14.04.1-server-amd64.iso"
    },
    "builders": [
        {
            "vm_name": "dashbrew-ubuntu-14.04-amd64",
            "type": "vmware-iso",
            "guest_os_type": "ubuntu-64",
            "http_directory": "http",
            "iso_url": "{{ user `iso_url` }}",
            "iso_checksum": "{{ user `iso_checksum` }}",
            "iso_checksum_type": "sha1",
            "ssh_username": "{{ user `ssh_username` }}",
            "ssh_password": "{{ user `ssh_password` }}",
            "ssh_wait_timeout": "10000s",
            "tools_upload_flavor": "linux",
            "boot_command": [
                "<esc><esc><enter><wait>",
                "/install/vmlinuz auto",
                " console-setup/ask_detect=false",
                " console-setup/layoutcode=us",
                " console-setup/modelcode=pc105",
                " debconf/frontend=noninteractive",
                " debian-installer=en_US",
                " fb=false",
                " initrd=/install/initrd.gz",
                " kbd-chooser/method=us",
                " keyboard-configuration/layout=USA",
                " keyboard-configuration/variant=USA",
                " locale=en_US",
                " netcfg/get_domain=vm",
                " netcfg/get_hostname=vagrant",
                " noapic" ,
                " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg",
                " -- ",
                "<enter>"
            ],
            "shutdown_command": "echo 'vagrant'|sudo -S shutdown -P now",
            "disk_size": 10140,
            "vmx_data": {
                "memsize": "1024",
                "numvcpus": "2"
            }
        },
        {
            "type": "virtualbox-iso",
            "vm_name": "dashbrew-ubuntu-14.04-amd64",
            "boot_command": [
                    "<esc><wait>",
                    "<esc><wait>",
                    "<enter><wait>",
                    "/install/vmlinuz<wait>",
                    " auto<wait>",
                    " console-setup/ask_detect=false<wait>",
                    " console-setup/layoutcode=us<wait>",
                    " console-setup/modelcode=pc105<wait>",
                    " debconf/frontend=noninteractive<wait>",
                    " debian-installer=en_US<wait>",
                    " fb=false<wait>",
                    " initrd=/install/initrd.gz<wait>",
                    " kbd-chooser/method=us<wait>",
                    " keyboard-configuration/layout=USA<wait>",
                    " keyboard-configuration/variant=USA<wait>",
                    " locale=en_US<wait>",
                    " netcfg/get_domain=vm<wait>",
                    " netcfg/get_hostname=vagrant<wait>",
                    " noapic<wait>",
                    " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg<wait>",
                    " -- <wait>",
                    "<enter><wait>"
            ],
            "boot_wait": "10s",
            "disk_size": 40960,
            "guest_os_type": "Ubuntu_64",
            "guest_additions_path": "VBoxGuestAdditions_{{.Version}}.iso",
            "http_directory": "http",
            "iso_url": "{{user `iso_url`}}",
            "iso_checksum": "{{user `iso_checksum`}}",
            "iso_checksum_type": "sha1",
            "ssh_username": "{{user `ssh_username`}}",
            "ssh_password": "{{user `ssh_password`}}",
            "ssh_port": 22,
            "ssh_wait_timeout": "10000s",
            "shutdown_command": "echo '{{user `ssh_username`}}' | sudo -S shutdown -P now",       
            "virtualbox_version_file": ".vbox_version",
            "vboxmanage": [
                [
                    "modifyvm",
                    "{{.Name}}",
                    "--memory",
                    "1024"
                ],
                [
                    "modifyvm",
                    "{{.Name}}",
                    "--cpus",
                    "2"
                ]
            ]
        }
    ],
    "post-processors": [
        {
            "type": "vagrant",
            "compression_level": 8
        }
    ],
    "provisioners": [
        {
            "type": "file",
            "source": "config-files",
            "destination": "/tmp"
        },
        {
            "type": "shell",
            "execute_command": "echo '{{user `ssh_password`}}' | {{.Vars}} sudo -S -E bash '{{.Path}}'",
            "scripts": [
                "scripts/base.sh",
                "scripts/networking.sh",
                "scripts/vmtools.sh",
                "scripts/packages.sh"
            ],
            "environment_vars": [
                "PACKER_SSH_USERNAME={{user `ssh_username`}}",
                "PACKER_SSH_PASSWORD={{user `ssh_password`}}"
            ]
        },
        {
            "type": "shell",
            "execute_command": "{{.Vars}} bash -c '{{.Path}}'",
            "scripts": [
                "scripts/user.sh"
            ],
            "environment_vars": [
                "PACKER_SSH_USERNAME={{user `ssh_username`}}",
                "PACKER_SSH_PASSWORD={{user `ssh_password`}}"
            ]
        },
        {
            "type": "shell",
            "execute_command": "echo '{{user `ssh_password`}}' | {{.Vars}} sudo -S -E bash '{{.Path}}'",
            "scripts": [
                "scripts/cleanup.sh",
                "scripts/zerodisk.sh"
            ],
            "environment_vars": [
                "PACKER_SSH_USERNAME={{user `ssh_username`}}",
                "PACKER_SSH_PASSWORD={{user `ssh_password`}}"
            ]
        }
    ]
}