Sven's comment above sums up why I migrated it. You're using a development tool, which is used much more frequently by SO folks than SF folks. So not only is your question off-topic *here*, but it stands a better chance of being answered *there*. So in that regard, you're in a better situation now than if your question was left here.

If you'd been asking about general docker engine use, from the command-line, on a Linux server, the question would be on-topic here.

I would like to address your below comment about this not being a development tool. To do so, I'll quote from Docker's [website](https://www.docker.com/docker-mac), emphasis mine:

> Docker for Mac is an easy-to-install desktop app for building,
> debugging and testing Dockerized apps on a Mac. **Docker for Mac is a
> complete development environment deeply integrated with the MacOS
> Hypervisor framework, networking and filesystem.** Docker for Mac is
> the fastest and most reliable way to run Docker on a Mac.