Dear whiskers. I am working on upgrading Docker version in https://github.com/apache/incubator-openwhisk/pull/4430. And one thing comes up in my mind.
These days, it seems Docker implicitly recommends to use Docker for mac( https://docs.docker.com/docker-for-mac/install/) as they name it as `Docker Desktop for Mac` to express it is a standard way to use Docker in Mac. And even they provide the guide to migrate from Docker-machine(Docker Toolbox): https://docs.docker.com/docker-for-mac/docker-toolbox/ to Docker For Mac. Considering the relative easiness of setting up Docker for mac, it's not surprising. (Though there are still fundamental limitations in Docker For Mac.) With DockerForMacContainerFactory, it became easier to utilize Docker for mac in mac hosts. So I proposed to drop supports for Docker machine. Please share your opinion if you disagree with this. If there's no objection, I will drop supports for Docker machine in https://github.com/apache/incubator-openwhisk/pull/4430 Best regards Dominic
