• Install a minimal system of CentOS in VirtualBox
• Activate networking on boot by enabling eth0 in

  .
  .
  .
  ONBOOT=yes
  .
  .
  .
  

• Add a vagrant user and assign the password vagrant to it
• Give sudo rights to that user by adding vagrant ALL=(ALL) NOPASSWD: ALL with visudo
• Disable requirement of having a TTY by commenting out the following settings with visudo:

  #Defaults    requiretty
  #Defaults   !visiblepw

• Add insecure Vagrant public key from https://github.com/mitchellh/vagrant/blob/master/keys/vagrant.pub to vagrant’s authorized_keys
• Add development tools for building the guest addons with

  yum --disablerepo=\* --enablerepo=c6-media install kernel-devel gcc make dkms perl

  The repo options are useful if you want to install from local installation media (ISOs) instead of fetching all from the net.

• Install guest addons with

  ./VBoxLinuxAdditions.run --nox11

• halt the machine
• Remove all hardware that is not necessary from the base machine or else it will be available on the machines set up with Vagrant later!
• Package Box with

  vagrant package --base Name-Of-Machine-In-VirtualBox

Done!

Should Vagrant be unable to connect to your boxes derived from that base box, you might have a problem with SELinux, see here how this can be fixed!