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A simple Rails application configured for PostgreSQL and Docker
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route "root to: 'posts#index'" | |
generate :scaffold, 'post', 'title:string', 'body:text' | |
file 'config/database.yml', <<-CODE | |
default: &default | |
adapter: postgresql | |
encoding: unicode | |
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %> | |
host: db | |
username: <%= ENV.fetch('POSTGRES_USER') { 'postgres' } %> | |
password: <%= ENV.fetch('POSTGRES_PASSWORD') { 'secret123' } %> | |
development: | |
<<: *default | |
database: my-app_development | |
test: | |
<<: *default | |
database: my-app_test | |
production: | |
<<: *default | |
database: my-app_production | |
CODE | |
file 'Dockerfile', <<-CODE | |
FROM ruby:2.6-alpine | |
# Set local timezone | |
RUN apk add --update tzdata && cp /usr/share/zoneinfo/Europe/London /etc/localtime && echo "Europe/London" > /etc/timezone | |
# Install your app's runtime dependencies in the container | |
RUN apk add --update --virtual runtime-deps postgresql-client nodejs libffi-dev readline sqlite xz-libs | |
# Install Yarn | |
ENV PATH=/root/.yarn/bin:$PATH | |
RUN apk add --virtual build-yarn curl && \ | |
touch ~/.bashrc && \ | |
curl -o- -L https://yarnpkg.com/install.sh | sh && \ | |
apk del build-yarn | |
# Bundle into the temp directory | |
WORKDIR /tmp | |
ADD Gemfile* ./ | |
RUN apk add --virtual build-deps build-base postgresql-dev libc-dev linux-headers libxml2-dev libxslt-dev readline-dev && bundle install --jobs=2 && apk del build-deps | |
# Copy the app's code into the container | |
ENV APP_HOME /app | |
COPY . $APP_HOME | |
WORKDIR $APP_HOME | |
# Configure production environment variables | |
ENV RAILS_ENV=production | |
ENV RACK_ENV=production | |
# Precompile assets into the container | |
RUN bin/rails webpacker:install | |
RUN bin/rails assets:precompile | |
# Expose port 3000 from the container | |
EXPOSE 3000 | |
# Run puma server by default | |
CMD ["bundle", "exec", "puma", "-C", "config/puma.rb"] | |
CODE |
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