View source for Creating and Managing VirtualBox Virtual Machines

Having downloaded and installed VirtualBox on a host computer, the next step is to create and run virtual machines within the VirtualBox environment. Virtual machines may be created and managed using a number of different tools included with the VirtualBox installation. For the the purposes of this chapter, the ''VirtualBox'' tool will be used.

== Launching the VirtualBox Tool ==

The mechanism for launching ''VirtualBox'' differs depending on the host operating system as follows:

* '''Linux Host''' - With some desktop environments, a ''Sun xVM VirtualBox'' option will be available from the ''Applications->System Tools'' menu. The executable is also located in ''/usr/bin'' and may be launched from by entering ''VirtualBox'' at a terminal window prompt. If ''/usr/bin'' is not currently in the user's $PATH environment variable, the entire path to the executable (''/usr/bin/VirtualBox'') will need to be entered.

* '''Windows Host''' - On Windows hosts, VirtualBox can be launched by selecting ''Start->All Programs->Sun xVM VirtualBox->VirtualBox''. Alternatively, the tool can be launched from the command prompt by changing directory to the VirtualBox installation folder (C:\Program Files\Sun\xVM VirtualBox'' by default) and executing ''VirtualBox''.

* '''Solaris Host''' - With some desktop environments, a ''Sun xVM VirtualBox'' option will be available from the ''Applications->System Tools'' menu. The executable is also located in ''/usr/bin'' and may be launched from by entering ''VirtualBox'' at a terminal window prompt. If ''/usr/bin'' is not currently in the user's $PATH environment variable, the entire path (''/usr/bin/VirtualBox'') will need to be entered.

* '''Mac OS X Host''' - VirtualBox can be launched by double clicking on ''VirtualBox'' in the Applications folder of the Finder.

When VirtualBox starts for the first time, the following screen appears. Note that the left hand pane contains no existing virtual machines. The next step, therefore, is to create a new virtual machine.

[[Image:virtualbox_initial_screen.jpg|VirtualBox with no Virtual Machines configured]]

== Creating a New VirtualBox Virtual Machine ==

New virtual machines are created using the ''Create New Virtual Machine'' wizard. This wizard is launched by clicking on the ''New'' button in the toolbar or selecting the ''Machine->New'' menu option. After the ''Welcome'' screen has displayed, clicking ''Next'' displays the ''VM Name and OS Type'' screen illustrated below:


[[Image:virtualbox_vm_name_and_os_type.jpg|Specifying the name and OS type for a virtual machine]]


Enter a name which will descriptively and uniquely identify the virtual machine and then select the type of operating system to be installed as the guest in the virtual machine. If the exact operating system is not listed it may not be officially supported (see [[VirtualBox Supported Host and Guest Operating Systems]] for a list of supported guest operating systems). Even if the guest operating system is not listed it may still run inside a VirtualBox virtual machine. In this case, select the operating system which most closely resembles your chosen operating system.

== Specifying Virtual Machine Memory ==

The next wizard screen allows the amount of memory to be allocated to the virtual machine to be defined. This is essentially the amount of physical memory installed in the host computer system which is to be made available to the virtual machine. The amount of memory allocated on this screen will depend on a number of factors:

* The total amount of physical memory installed in the host computer

* The amount of memory required by the host operating system to operate effectively

* The amount of memory required by the guest operating system to operating effectively

* The number of other virtual machines running on the host concurrently with the new virtual machine and the memory requirements of those virtual machines

Memory allocation is configured using the sliding scale control, the maximum value of which is equal to the amount of physical memory installed in the host:


[[Image:virtualbox_virtual_machine_memory.jpg|Configuring memory for a VirtualBox virtual machine]]


== Configuring a Virtual Hard Disk ==

Once the memory for the virtual machine has been defined, the next task is to configure disk storage. VirtualBox provides a number of options for providing disk space for a virtual machine. A detailed overview of virtual disks is provide in the [[Understanding and Configuring VirtualBox Virtual Hard Disks]] chapter.

The most straightforward method for providing a virtual machine with disk storage is to either create or use an existing virtual disk image file. A virtual disk image file is essentially a file which resides on, or is accessible to, the file system of the host operating system and acts as a virtual disk drive for the virtual machine. VirtualBox supports existing ''.vmdk'', ''.vdi'' and ''.vhd'' image files. An existing disk image file may be attached to the virtual machine by clicking on the ''Existing...''' button. Alternatively, a new virtual disk drive can be created using the ''Create New Virtual Disk'' wizard by clicking on ''New...''.:


[[Image:virtualbox_new_virtual_disk.jpg|Creating a new virtual disk for a VirtualBox VM]]


The ''Hard Disk Storage Type'' screen illustrated above defines the type of the virtual disk drive. The two options available are as follows:

* '''Dynamically Expanding Storage''' - The disk image file is created at a minimal size and then grows automatically as more space is needed by the guest operating system (up to a specified maximum). This has the advantage that disk space on the host is not used until it is needed, but can result in slower performance if the disk needs to be enlarged frequently.

* '''Fixed-size Storage''' - The disk image file is created to the specified size. This pre-allocates all the requested disk space regardless of whether it is immediately needed, but results in improved disk write performance.

Once the storage type has been defined, clicking ''Next'' displays the ''Virtual Disk Location and Size'' screen:


[[Image:virtualbox_virtual_disk_location_and_size.jpg|Specifying the size and location of a virtualbox virtual hard disk]]


By default, the disk image file will be located in the same folder as the other files relating to the new virtual machine. TYhe disk size is specified using the slider control (up to a maximum size of 2TB).

Click ''Next'' followed by ''Finish'' to create the virtual disk and return to the New Virtual Machine wizard.

Clicking ''Next'' in the wizard displays the Summary screen. Assuming that the information is correct, click ''Finish'' to create the new virtual machine. Once the creation process is complete, the new virtual machine will appear in the list pane on left hand side of the VirtualBox window, together with details of the configuration in the ''Details'' pane:


[[Image:virtualbox_vm_details.jpg|A new virtual machine with details]]


== The VirtualBox First Run Wizard ==

It may not have gone unnoticed that none of the above steps involved configuring a CD or DVD drive for the virtual machine. This raises the obvious question of how to install the guest operating system.

Fortunately, this issue is resolved by the VirtualBox ''First Run Wizard''. This wizard is invoked automatically when a new virtual machine which has a new virtual disk as the boot device (VirtualBox assumes that an existing virtual disk already has a guest operating system installed on it) is started as illustrated in the following figure:


[[Image:virtualbox_first_run_wizard.jpg|The VirtualBox First Run Wizard]]


The purpose of the First Run Wizard is to configure the virtual machine so that it can find the guest operating system installation media. Clicking ''Next>'' on the ''Welcome'' screen displays the ''Select Installation Media'' settings screen as shown in the following figure:


[[Image:virtualbox_select_installation_media.jpg|Selecting installation media for a new VirtualBox virtual machine]]


The installation media may be in the form of a physical CD, DVD or floppy installed into a drive connected to the host computer system. Alternatively, the media may be an ISO image file which is accessible to the host operating system. 

In the case of physical media, select the ''Host Drive'' from the ''Media Source'' section of the screen and select the drive into which the disk has been mounted.

When using an ISO image file, the file must first be added to the VirtualBox virtual media library. If the image file has not already been added, click on the button next to the ISO image name to launch the Virtual Media Manager, click the ''Add'' button and navigate to the file. Once the file has been added by the Virtual Media Manager it will appear in the drop down list of files ready for selection.

Once the selection has been made, click ''Next>'', review the summary information displayed and click ''Finish'' to boot the virtual machine and begin the guest installation process from the designated media:


[[Image:virtualbox_running_vm.jpg|WIndows Vista installation in a VirtualBox virtual machine]]