Open VirtualBox and click on New Machine button
To make the things easier, select the Expert Mode in the pop-up windows
This machine will be the master node on our cluster, for that reason @yulwitter name it as MasterVi (our Virtual Master, thanks for the fancy name). Clearly we need to set Type to Linux, and Version to Fedora (64-bit) (or Fedora if you have a 32-bit version). After putting the mane and set the RAM memory to 1024 MB press Create.
Select the Expert Mode again, and set the space of the virtual disk in 16 GB, then press create.
Before to start our virtual Machine, we need to setup some things. Click on Settings button.
In General select the Advanced tab, set both Share Clipboard and Drag’n’Drop to bidirectional.
Now go to Storage and select the Empty entry under Controler: IDE. In attributes, click on the disk image and Chose Virtual Optical Disk File. Search your ISO image of Fedora Server and select it.
The final part of this step is make our Virtual Machine available in our network. In the Network menu set Attached to to Bridged Adapter option, then select the name of your network interface, in my case this is
Now we are ready to press Start.
Press the Start button and follow this video to finish the installation.