Docker for Rails Developers

Chapter 13A Production-Like Playground

We’re so close. In the previous chapter, we configured our application so it’s ready to run in production environments, and we pushed our image to Docker Hub. However, before we start setting up cloud-based infrastructure and deploying it there, we’re first going to get our sea legs, so to speak, by having a practice run locally.

In this chapter, we’ll make use of virtualization technologies—specifically, VirtualBox—to create virtual infrastructure on our local machine that can simulate a production environment. We’ll create a single node cluster, capable of running Docker containers. Not only will we deploy our application, we’ll also see how to scale up the app and run multiple copies of it on this ...