FROM ruby:2.5-alpine # Edit with nodejs, mysql-client, postgresql-client, sqlite3, etc. for your needs. # Or delete entirely if not needed. RUN apk --no-cache add nodejs postgresql-client tzdata # throw errors if Gemfile has been modified since Gemfile.lock RUN bundle config --global frozen 1 WORKDIR /usr/src/app COPY Gemfile Gemfile.lock . # Install build dependencies - required for gems with native dependencies RUN apk add --no-cache --virtual build-deps build-base postgresql-dev && \ bundle install && \ apk del build-deps COPY . . # For Sinatra #EXPOSE 4567 #CMD ["ruby", "./config.rb"] # For Rails ENV PORT 3000 EXPOSE 3000 CMD ["bundle", "exec", "rails", "server"]