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    Ruby on Rails Dockerfile for Oracle Cloud ARM

    Puma, Sidekiq and Active Storage on an ARM instance with no per-dyno pricing. Built for Ampere A1 (arm64), listens on port 3000, and starts with bundle exec puma -C config/puma.rb.

    Dockerfile
    FROM ruby:3.3-alpine
WORKDIR /app
RUN apk add --no-cache build-base postgresql-dev tzdata nodejs yarn
COPY Gemfile Gemfile.lock ./
RUN bundle config set --local without 'development test' && bundle install
COPY . .
ENV RAILS_ENV=production RAILS_SERVE_STATIC_FILES=true RAILS_LOG_TO_STDOUT=true
RUN SECRET_KEY_BASE=dummy bundle exec rails assets:precompile
EXPOSE 3000
CMD ["bundle", "exec", "puma", "-C", "config/puma.rb"]

    ARM notes for Ruby on Rails

    Native gems (pg, nokogiri, bcrypt) compile cleanly on Ampere but add a minute or two to cold builds; layer caching makes subsequent deploys fast.

    Skip the build, network and TLS setup

    Cheaploy builds this image on your own Oracle Always Free VM, opens the ports, issues HTTPS and rolls back if health checks fail.

    Deploy Ruby on Rails Full Ruby on Rails guide

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