With the shared folders feature of Oracle VM VirtualBox, you can access files of your host system from within the guest system. This is similar to how you would use network shares in Windows networks, except that shared folders do not require networking, only the Guest Additions. Shared folders are supported with Windows 2000 or later, Linux, and Oracle Solaris guests. Oracle VM VirtualBox includes experimental support for Mac OS X and OS/2 guests.

Shared folders physically reside on the host and are then shared with the guest, which uses a special file system driver in the Guest Additions to talk to the host. For Windows guests, shared folders are implemented as a pseudo-network redirector. For Linux and Oracle Solaris guests, the Guest Additions provide a virtual file system.

To share a host folder with a virtual machine in Oracle VM VirtualBox, you must specify the path of the folder and choose a share name that the guest can use to access the shared folder. This happens on the host. In the guest you can then use the share name to connect to it and access files.

There are several ways in which shared folders can be set up for a virtual machine:

• In the window of a running VM, you select Shared Folders from the Devices menu, or click on the folder icon on the status bar in the bottom right corner.

• If a VM is not currently running, you can configure shared folders in the virtual machine's Settings window.

• From the command line, you can create shared folders using VBoxManage, as follows:

  VBoxManage sharedfolder add "VM name" --name "sharename" --hostpath "C:\test"

  See .

There are two types of shares:

• Permanent shares, that are saved with the VM settings.

• Transient shares, that are added at runtime and disappear when the VM is powered off. These can be created using a check box in VirtualBox Manager, or by using the --transient option of the VBoxManage sharedfolder add command.

Shared folders can either be read-write or read-only. This means that the guest is either allowed to both read and write, or just read files on the host. By default, shared folders are read-write. Read-only folders can be created using a check box in the VirtualBox Manager, or with the --readonly option of the VBoxManage sharedfolder add command.

Oracle VM VirtualBox shared folders also support symbolic links, also called symlinks, under the following conditions:

• The host operating system must support symlinks. For example, a macOS, Linux, or Oracle Solaris host is required.

• Currently only Linux and Oracle Solaris Guest Additions support symlinks.

• For security reasons the guest OS is not allowed to create symlinks by default. If you trust the guest OS to not abuse the functionality, you can enable creation of symlinks for a shared folder as follows:

  VBoxManage setextradata "VM name" VBoxInternal2/SharedFoldersEnableSymlinksCreate/sharename 1