Docker for Rails Developers

Chapter 3Fine-Tuning Our Rails Image

We covered a lot of ground in the previous chapter. We saw our first Dockerfile, which we used to build a custom image, tailored for running our Rails app.

However, you may recall that we said this Dockerfile was “good enough” but “not perfect” (​Defining Our First Custom Image​). The truth is, we took a few shortcuts for the sake of simplicity. Now that you have some Docker fundamentals under your belt, we can go back and address these issues.

By the end of this chapter, we’ll have our Dockerfile looking shipshape and ready for us to dive into the final piece of the development puzzle—Docker Compose—but I’m getting ahead of myself.

So grab some overalls, a trusty wrench, and plenty of spit and polish—you’re ...