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Old 11-09-2017, 08:43 AM   #1
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Docker Machines, why?

I came across a site with a post on "Create & manage docker hosts with Docker Machine on VirtualBox". I occasionally use Virtualbox for personal trips to the computing past but can't figure out why one would want a "Docker Machine" nor quite what it is.

So what is a Docker Machine and why would one want one?

Sorry to be such n00b.
Old 11-09-2017, 09:08 AM   #2
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Docker is a container type. Containers are smaller than Virtual guests in that they don't require the entire OS within each container. The idea is each container would contain only the services required for its purpose. Also each container within a base OS platform that runs Docker can be built on separate distros. For example here we use CoreOS as our base operating system that runs Docker. The containers under that are a mix of CentOS, Fedora, Ubuntu etc...
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Old 11-09-2017, 10:22 AM   #3
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I actually wonder why Docker is so highly praised in 2017; first, because of the hype (seriously, "containers" were a thing on Unix before Linux even existed, but Docker has a shinier logo or something), second, because it's not quite transparent. True, it is easier to type one Docker command to install stuff instead of a whole command chain, but I, for one, prefer to actively see what is happening right now.

Maybe my mindset is wrong on this one.
Old 11-09-2017, 11:16 AM   #4
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Docker Machine is used mostly when you want to run Docker from a Windows or Mac system. On Linux, it's used primarily to configure Docker on remote hosts.

Prior to V1.12, the Docker engine ran only on Linux, so Docker Machine was used on Windows and Mac systems. On those machines, the Docker toolkit would create a local Linux VM, and docker-machine is used to install the Docker engine, configure the Docker client, and manage Docker on the local VM. Starting with V1.12, Docker is available as a native app on some versions of Windows and Mac, but docker-machine still appears to be a component within the native Docker app on those platforms.
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