template.json

{
    "variables": {
        "aws_access_key": "",
        "aws_secret_key": "",
        "project_id": "{{env `GCE_PROJECT_ID`}}",
        "gce_account_file": "{{env `GCE_ACCOUNT_FILE`}}",
        "publish_settings_path": "{{env `AZURE_PUBLISH_SETTINGS`}}"
    },
    "push": {
      "name": "darron/octohost"
    },
    "builders": [{
            "type": "amazon-ebs",
            "access_key": "{{user `aws_access_key`}}",
            "secret_key": "{{user `aws_secret_key` }}",
            "region": "us-east-1",
            "source_ami": "ami-2dcf7b46",
            "instance_type": "c3.large",
            "ssh_username": "ubuntu",
            "ami_name": "octohost-chef {{timestamp}}"
            },
            {
              "type": "digitalocean",
              "image": "ubuntu-14-04-x64",
              "droplet_name": "octohost-chef-{{timestamp}}",
              "size": "1gb",
              "region": "nyc3",
              "snapshot_name": "octohost-chef {{timestamp}}"
            },
            {
              "type": "openstack",
              "provider": "rackspace-us",
              "openstack_provider": "rackspace",
              "region": "iad",
              "ssh_username": "root",
              "image_name": "octohost-chef {{timestamp}}",
              "source_image": "28153eac-1bae-4039-8d9f-f8b513241efe",
              "flavor": "3"
            },
            {
              "type": "googlecompute",
              "project_id": "{{user `project_id`}}",
              "account_file": "{{user `gce_account_file`}}",
              "source_image": "ubuntu-1404-trusty-v20150128",
              "zone": "us-central1-f",
              "image_name": "octohost-{{timestamp}}",
              "disk_size": 40
            },
            {
              "type": "azure",
              "publish_settings_path":    "{{user `publish_settings_path`}}",
              "subscription_name":    "Free Trial",
              "storage_account":  "octohost",
              "storage_account_container":    "images",
              "os_type":  "Linux",
              "os_image_label":   "Ubuntu Server 14.04 LTS",
              "location": "South Central US",
              "instance_size":    "Medium",
              "user_image_label": "octohost-{{timestamp}}"
            },
            {
              "type": "virtualbox-iso",
              "guest_os_type": "Ubuntu_64",
              "iso_url": "http://releases.ubuntu.com/14.04/ubuntu-14.04.2-server-amd64.iso",
              "iso_checksum": "83aabd8dcf1e8f469f3c72fff2375195",
              "iso_checksum_type": "md5",
              "ssh_username": "packer",
              "ssh_password": "packer",
              "ssh_wait_timeout": "30s",
              "shutdown_command": "echo 'packer' | sudo -S shutdown -P now"
            }],

    "provisioners": [{
        "type": "shell",
        "inline": ["sudo apt-get clean && sudo apt-get update && DEBIAN_FRONTEND=noninteractive sudo apt-get -o Dpkg::Options::=\"--force-confdef\" -o Dpkg::Options::=\"--force-confold\" --force-yes -y upgrade"]
      },{
      "type": "chef-solo",
      "install_command": "curl -L https://www.opscode.com/chef/install.sh | sudo bash",
      "cookbook_paths": ["./vendor/cookbooks"],
      "run_list": [ "octohost" ]
    }]
}