Introduction
Oracle VM VirtualBox is an x86 virtualization software package. §VirtualBox is installed on an existing host operating system as an §application; this host application allows additional guest operating §systems, each known as a Guest OS, to be loaded and run, each with its §own virtual environment. Supported host operating systems include Linux, §Mac OS X, Windows XP, Windows Vista, Windows 7, Solaris, and §OpenSolaris; there is also a port to FreeBSD. Supported guest operating §systems include versions and derivations of Windows, Linux, BSD, OS/2, §Solaris and others.
Links
Useful Commands
Change UUID of a VirtualDisk
VBoxManage internalcommands sethduuid copiedfile.vdi
Clone VirtualDisk
VBoxManage clonevdi /path/to/existing.vdi new.vdi
Shrink dynamic image
VBoxManage modifyvdi vm_hd.vdi compact
Resize VirtualDisk
After resizing the harddisk file it, the partition needs to be resized to in gparted for Linux of Disk Management in Windows
VBoxManage modifyhd YOUR_HARD_DISK.vdi --resize SIZE_IN_MB
VBoxManage modifyhd pentaho_vm.vdi --resize 40000 # resize to 40GB