packer.json

{
  "variables": {
    "compression_level": "6",
    "cpus": "2",
    "headless": "false",
    "memory": "4096",
    "ssh_timeout": "60m"
  },
  "builders": [{
    "type": "virtualbox-ovf",
    "source_path": "target/amzn2.ova",
    "output_directory": "target/{{build_type}}",

    "vm_name": "packer-amzn2",
    "headless": "{{user `headless`}}",

    "ssh_timeout": "{{user `ssh_timeout`}}",
    "ssh_username": "vagrant",
    "ssh_private_key_file": "vagrant.key",
    "shutdown_command": "sudo systemctl poweroff",

    "vboxmanage": [
      ["modifyvm", "{{.Name}}", "--cpus", "{{ user `cpus`}}"],
      ["modifyvm", "{{.Name}}", "--memory", "{{ user `memory` }}"]
    ]
  }],
  "provisioners": [{
    "type": "shell",
    "scripts": [
      "scripts/virtualbox.sh",
      "scripts/vagrant.sh",
      "scripts/sshd.sh",
      "scripts/cleanup.sh",
      "scripts/minimize.sh"
    ]
  }],
  "post-processors": [{
    "type": "vagrant",
    "compression_level": "{{user `compression_level`}}",
    "output": "target/amzn2-{{.Provider}}.box"
  }]
}