CentOS 7 Packer build

box.json

{
  "builders": [
    {
      "boot_command": [
        "<esc><wait>",
        "linux ks=http://{{ .HTTPIP }}:{{ .HTTPPort }}/ks.cfg ",
        "<enter><wait>"
      ],
      "boot_wait": "10s",
      "guest_os_type": "RedHat_64",
      "headless": true,
      "http_directory": "./",
      "iso_checksum": "ee505335bcd4943ffc7e6e6e55e5aaa8da09710b6ceecda82a5619342f1d24d9",
      "iso_checksum_type": "sha256",
      "iso_url": "http://ftp.iij.ad.jp/pub/linux/centos/7.0.1406/isos/x86_64/CentOS-7.0-1406-x86_64-DVD.iso",
      "shutdown_command": "sudo shutdown -P now",
      "ssh_password": "vagrant",
      "ssh_username": "vagrant",
      "ssh_wait_timeout": "3000s",
      "type": "virtualbox-iso",
      "vboxmanage": [
        [
          "modifyvm",
          "{{ .Name }}",
          "--pae",
          "on"
        ]
      ],
      "vm_name": "box"
    }
  ],
  "post-processors": [
    {
      "output": "CentOS-7.0-x86_64.box",
      "type": "vagrant"
    }
   ]
}

ks.cfg

#version=RHEL7
# System authorization information
auth --enableshadow --passalgo=sha512

# Use CDROM installation media
cdrom
# Use text mode install
text
# Run the Setup Agent on First boot
firstboot --enable
ignoredisk --only-use=sda
# Keyboard layouts
keyboard --vckeymap=jp --xlayouts='jp'
# System language
lang en_US.UTF-8
# custom
#firewall --enabled --service=ssh
firewall --disabled
selinux --disabled

# Network information
network  --bootproto=dhcp --device=enp0s3 --onboot=on --ipv6=auto --activate
network  --hostname=localhost.localdomain
# Root password
rootpw vagrant
# Do not configure the X Window System
skipx
# System imezone
timezone Asia/Tokyo --isUtc
# System bootloader configuration
bootloader  --location=mbr --boot-drive=sda
# Partition clearing information
clearpart --all --initlabel --drives=sda
autopart --type=lvm
reboot

%packages
@core

%end