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→What are drivers
The default value of the driver parameter is "virtualbox".
'''docker-machine''' can create and manages VMs on the local host and on remote clouds. Always the chosen driver determines where and how the machine will be created. The guest operating system that is being installed on the new machine is also determined by the hypervisor driver. E.g. with the "virtualbox" driver you can create machines locally using the boot2docker as the guest OS.
The driver also determines the virtual network types and interfaces types that are created inside the machine. E.g. the KVM driver creates two virtual networks (bridges), one host-global and one host-private network, and name of the host-private network is hardcoded.
Here is a complete list of the currently available drivers: https://github.com/docker/docker.github.io/blob/master/machine/AVAILABLE_DRIVER_PLUGINS.md
===KVM driver===