Kvm

Virtualization platforms have drawbacks for light home use, although they’re often free for single server installation. They may only be supported on specific hardware (VmWare ESXi, their configuration isn’t simple (Xen, or they chew up a significant amount of CPU even when they’re idle (VirtualBox. Often, they force you to pre-allocate all the RAM you might need when you start each virtual machine (VM). If you’re running several VM’s, you may run out of memory, or performance drags.