With a few commands and a few lines of a configuration file, you're already setup. Do you really want to go install, troubleshoot, and follow varying installation instructions that depend on the machine? Then make the pieces work, one-by-one on every machine, without the assurance of they won't encounter any varying errors along the way?

You have 12 clean slate machines, with a combination of linux and mac computers. Let's say you have a team of developers, designers, and testers, and have an app with a back-end server, database server, and caching server. Dan said in his tutorial: 'Docker can help there because we can make one or more images that can then be converted into running containers, and those containers can run on our different developer, and even designer machines.' When I was watching an online tutorial about docker, Dan Wahlin, the teacher, said that one of the benefits of docker is to accelerate developer on-boarding. With Docker, it's just a few commands to cleanup. Install docker, load your dockerfiles, run a few commands in your terminal, you're already setup! And also, what if you want to uninstall all that you did? It's hard to track what steps to undo. I forgot how to install it again and it's a pain to repeat the steps. But I didn't list or take note of the websites I've visited to make it work on my machine. It took me over 3 hours of installing, troubleshooting, and searching the documentation to get it working. Setting up Ruby On Rails with with these tools is great. Why use docker? Why not just install it on your local machine, and install Ruby Version Manager (rvm) or Ruby Environment (rbenv)? Making new rails app and starting the server.Not only can Docker run web-apps, servers, and databases, but it can also be a local development environment! I wrote this article not only so you can learn how to do it, but also for me, so I won't forget it. That's what I first thought after watching videos about Docker. You've likely heard about Docker terms like containers, images, services, volumes, network, Dockerfile, docker-compose file, right? Or you've watched some videos about what it is, but you're not sure how can it apply to your daily life as a developer?

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