docker-machine upgrade

Upgrade a machine to the latest version of Docker. How this upgrade happens depends on the underlying distribution used on the created instance.

For example, if the machine uses Ubuntu as the underlying operating system, it runs a command similar to sudo apt-get upgrade docker-engine, because Machine expects Ubuntu machines it manages to use this package. As another example, if the machine uses boot2docker for its OS, this command downloads the latest boot2docker ISO and replace the machine’s existing ISO with the latest.

$ docker-machine upgrade default

Stopping machine to do the upgrade...
Upgrading machine default...
Downloading latest boot2docker release to /home/username/.docker/machine/cache/boot2docker.iso...
Starting machine back up...
Waiting for VM to start...

Note: If you are using a custom boot2docker ISO specified using --virtualbox-boot2docker-url or an equivalent flag, running an upgrade on that machine completely replaces the specified ISO with the latest “vanilla” boot2docker ISO available.

machine, upgrade, subcommand

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https://docs.docker.com/v17.12/machine/reference/upgrade/