Docker for Rails Developers

Running a Rails Server with Our Image

Now that we’ve created our own tailor-made image, we should be able to start up a Rails server to run our app.

Let’s try doing that now.

We can refer to our image by its ID. However, image IDs are long and hard to remember, so normally you would assign a meaningful name to an image. We’ll see how to do that later in ​Naming and Versioning Our Image​. For now, though, referring to our image by its ID is good enough to let us start using the image. Let’s crack on and do just that.

Image ID in hand, we can start our Rails app inside a container based on our custom image with the following command. Let’s run it now:

$ docker run -p 3000:3000 a1df0eddba18 \
    bin/rails s  ...