If you are build a saas, using VMs and management tools. You will find vagrant is useful for additional features.
But Virtual machines take too much time to load. Now there is a new trending called using docker. Docker is written in go, if you haven't heard of, you should probably go to check it out. In this article I am going to run a docker container in vagrant virtual machine
Vagrant is a tool for building complete development environments. With an easy-to-use workflow and focus on automation, Vagrant lowers development environment setup time, increases development/production parity, and makes the "works on my machine" excuse a relic of the past.