I needed a non-libvirt qemu driver, so this is it.

Its initial use is going to be for running the Rancher OS tests, but maybe you'll find a use for it too.

from @fventuri

Create machines locally using QEMU. This driver requires QEMU to be installed on your host.

$ docker-machine create --driver=qemu qemu-test

Options:

• --qemu-boot2docker-url: The URL of the boot2docker image. Defaults to the latest available version.
• --qemu-disk-size: Size of disk for the host in MB. Default: 20000
• --qemu-memory: Size of memory for the host in MB. Default: 1024
• --qemu-network-bridge: Name of the virtual bridge to be used for networking. Default: virbr0

The --qemu-boot2docker-url flag takes a few different forms. By default, if no value is specified for this flag, Machine will check locally for a boot2docker ISO. If one is found, that will be used as the ISO for the created machine. If one is not found, the latest ISO release available on boot2docker/boot2docker will be downloaded and stored locally for future use. Note that this means you must run docker-machine upgrade deliberately on a machine if you wish to update the "cached" boot2docker ISO.

This is the default behavior (when --qemu-boot2docker-url=""), but the option also supports specifying ISOs by the http:// and file:// protocols. file:// will look at the path specified locally to locate the ISO: for instance, you could specify --qemu-boot2docker-url file://$HOME/Downloads/rc.iso to test out a release candidate ISO that you have downloaded already. You could also just get an ISO straight from the Internet using the http:// form.

Environment variables:

Here comes the list of the supported variables with the corresponding options. If both environment variable and CLI option are provided the CLI option takes the precedence.