
edruder
Docker for Rails Developers: Notes for Rails 6.1, Ruby 2.7.2
I thought that there might be interest in using the book with Rails 6.1 and Ruby 2.7.2. I’ll note what I needed to do differently here.
- p. 11
rails new myapp --skip-test
. Do not add the--skip-bundle
flag–it causes several steps of thenew
command to fail. (Notably,webpacker:install
doesn’t occur.) - p. 19 Update the
Dockerfile
to get a newer version of Ruby, a recent version ofyarn
, and set upwebpacker
:FROM ruby:2.7.2 # Ensure latest packages for Yarn RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=true apt-key add - RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list RUN apt-get update -yqq RUN apt-get install -yqq --no-install-recommends nodejs yarn WORKDIR /usr/src/app COPY . . RUN bundle install RUN yarn install
- p. 40 Modified
Dockerfile
afterThe Gemfile Caching Trick
:FROM ruby:2.7.2 # Ensure latest packages for Yarn RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=true apt-key add - && \ echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list && \ apt-get update -yqq && apt-get install -yqq --no-install-recommends \ nodejs \ yarn WORKDIR /usr/src/app COPY Gemfile* ./ RUN bundle install RUN yarn install COPY . . CMD ["bin/rails", "s", "-b", "0.0.0.0"]
- p. 88 In
Rails JavaScript Front End with Webpacker
, nothing needs to be done to installwebpacker
, since we installed it at the beginning. (There is no issue with the version ofnode
, either. In fact, running thecurl
to get an “up-to-date” version ends up installing a deprecated version.) You do need to install thewebpacker
React integration, though–docker-compose run web bin/rails webpacker:install:react
. - p. 96
Setting Up RSpec
, grab a newer version of RSpec–gem 'rspec-rails', '~> 4.0.1'
–per therspec-rails
installation instructions. - p. 96-97 I had to
stop
,build
, andup -d --force-recreate
thewebpack_dev_server
after doing the same forweb
, after installing RSpec. - p. 100
gem 'capybara', '~> 3.34'
Most Liked

edruder
- p. 146 With Rails 6, there’s a new way to handle secrets. Instead of defining
SECRET_KEY_BASE
, you’ll need to defineRAILS_MASTER_KEY
.- Run
bin/rails credentials:edit
and save the result. This will create the value of an encryption key inconfig/master.key
and an encrypted secrets file inconfig/credentials.yml.enc
. - Copy the value of the encryption key in
config/master.key
to theRAILS_MASTER_KEY
environment variable in.env/production/web
. (SECRET_KEY_BASE
is obsolete–don’t define it.)
- Run
3
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