Docker for Rails Developers

 Quick Recap

Wow, what an action-packed chapter! Let’s review the highlights:

1. We saw our first, rough-and-ready Dockerfile designed to allow us to run our app with a Rails server:

   FROM ruby:2.6                                           
   
   RUN apt-get update -yqq                                 
   RUN apt-get install -yqq --no-install-recommends nodejs 
   
   COPY . /usr/src/app/                                    
   
   WORKDIR /usr/src/app                                    
   RUN bundle install                                      

2. We built our custom image from this Dockerfile with:

   $ docker build .

3. We listed the images on our system by issuing:

   $ docker images

4. We started up a Rails server to run our app with:

   $ docker run -p 3000:3000 a1df0eddba18 \
    bin/rails s -b 0.0.0.0

And we saw it running in a browser on http://localhost:3000.

In the next chapter, we’ll ...