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Dockerfile
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Dockerfile
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FROM ruby:3.3.4-alpine as base
# Rails app lives here
WORKDIR /app
# tzdata: required to set timezone
RUN apk add --no-cache \
tzdata \
postgresql-client
# Ensure latest rubygems is installed
RUN gem update --system
# Throw-away build stage to reduce size of final image
FROM base as builder
# Install packages needed to build gems
RUN apk --no-cache add \
ruby-dev \
build-base \
postgresql-dev \
tzdata \
yarn
# Copy required files
COPY .ruby-version Gemfile* package.json yarn.lock ./
# Install gems and node packages
RUN bundle config deployment true && \
bundle config without development test && \
bundle install --jobs 4 --retry 3 && \
yarn install --frozen-lockfile --production
# Copy application code
COPY . .
# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
RUN RAILS_ENV=production SECRET_KEY_BASE_DUMMY=1 \
bundle exec rails assets:precompile
# Cleanup to save space in the production image
RUN rm -rf node_modules log/* tmp/* /tmp && \
rm -rf /usr/local/bundle/cache
# Final stage for app image
FROM base
# Copy built artifacts: gems, application
COPY --from=builder /app /app
COPY --from=builder /usr/local/bundle /usr/local/bundle
# Add non-root user and group with alpine first available uid, 1000
RUN addgroup -g 1000 -S appgroup && \
adduser -u 1000 -S appuser -G appgroup
# Create log and tmp
RUN mkdir -p log tmp
RUN chown -R appuser:appgroup ./*
# Set user
USER 1000
ARG APP_BUILD_DATE
ENV APP_BUILD_DATE ${APP_BUILD_DATE}
ARG APP_BUILD_TAG
ENV APP_BUILD_TAG ${APP_BUILD_TAG}
ARG APP_GIT_COMMIT
ENV APP_GIT_COMMIT ${APP_GIT_COMMIT}