When vagrant create Virtualbox machines, disks are created with VMDK format. Therefore, the VDI format has some interesting advantages. This recipe shows a setup to create VDI disks instead VMDK.

The process requires two steps: create and attach disk to the virtual controller. In the Vagrantfile we need to do it in the up if the disk file not exists yet.

The following is a working Vagrantfile using the described setup:

VAGRANTFILE_API_VERSION = "2"
HOME_DISK = "/var/home.vdi"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  config.vm.box = "deb/jessie-i386"

  config.vm.provider :virtualbox do |vb|
    if ARGV[0] == "up" && ! File.exist?(HOME_DISK)
      vb.customize ['createhd',
                    '--filename', HOME_DISK,
                    '--format', 'VDI',
                    '--size', 50000]

      vb.customize ['storageattach', :id,
                    '--storagectl', 'SATA Controller',
                    '--port', 0,
		    '--device', 0,
                    '--type', 'hdd',
		    '--medium', HOME_DISK]
    end
  end
end

WARNING: Vagrant will delete attacked virtual disk when you issue command vagrant destroy!.



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