We still use middleman for our static sites. Below you’ll find a super simple docker file with multistage builds.

Here is our Dockerfile. As you can see it builds it using 2 stages. One to build the container that runs middleman and one for copying the result in a small NGINX container.

# setup our builder
FROM ruby:2.3-alpine AS middleman-builder
ENV RAILS_ENV production

RUN apk update && apk --update add ruby ruby-irb nodejs ruby-json ruby-rake \
   ruby-bigdecimal ruby-io-console libstdc++ tzdata  \
   libffi-dev libxml2-dev libxslt-dev

# Necessary for some gems which are compiled on bundle install
RUN apk add --virtual build-deps git build-base ruby-dev \
   libc-dev linux-headers && \
   gem install bundler --no-ri --no-rdoc && \
   bundle config build.nokogiri --use-system-libraries

# Only do a bundle install if the gemfile changes
COPY Gemfile* /app/
RUN bundle install --clean --without development test
COPY . /app
RUN bundle exec middleman build --verbose

# Copy the resulting code to the nginx container
FROM nginx:alpine
COPY --from=middleman-builder /app/build /usr/share/nginx/html

And then build it

docker build -t site .

And to run it

docker run -p 9090:80 site

You can open it on:

open http://localhost:9090

Tada! You now have a tiny site :)

Want to learn about multistage builds?

Have fun hacking!

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