packer configuration for centos

centos73-1611.json

{
  "builders": [
    {
      "type": "virtualbox-iso",
      "guest_os_type": "RedHat_64",
      "iso_url": "http://ftp.daumkakao.com/centos/7.3.1611/isos/x86_64/CentOS-7-x86_64-Minimal-1611.iso",
      "iso_checksum": "27bd866242ee058b7a5754e83d8ee8403e216b93d130d800852a96f41c34d86a",
      "iso_checksum_type": "sha256",
      "http_directory": "http",
      "boot_command": "<tab> text ks=http://{{ .HTTPIP }}:{{ .HTTPPort }}/ks-centos73-1611.cfg<enter><wait>",
      "ssh_username": "vagrant",
      "ssh_password": "vagrant",
      "disk_size": 8192,
      "shutdown_command": "echo 'packer' | sudo -S shutdown -P now"
    }
  ]
}