RoR Docker template

template.rb

generate(:scaffold, "post", "title:string", "body:text")

file 'config/database.yml', <<-CODE
default: &default
  adapter: mysql2
  encoding: utf8
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  host: db
  username: <%= ENV.fetch('MYSQL_USER') %>
  password: <%= ENV.fetch('MYSQL_PASSWORD') %>

development:
  <<: *default
  database: ror_docker

test:
  <<: *default
  database: ror_docker

production:
  <<: *default
  database: ror_docker

CODE

file 'Dockerfile', <<-CODE
FROM ruby:2.3-alpine

# ------------------------------------------------------------------------------
# Set timezone
# ------------------------------------------------------------------------------

RUN apk add --update tzdata \
    && cp /usr/share/zoneinfo/Asia/Seoul /etc/localtime \
    && echo "Asia/Seoul" > /etc/timezone;

# ------------------------------------------------------------------------------
# Install banaries
# ------------------------------------------------------------------------------

RUN apk add --update --virtual \
        runtime-deps \
        mysql-client \
        nodejs \
        libffi-dev \
        readline \
        sqlite;

# ------------------------------------------------------------------------------
# Install gems
# ------------------------------------------------------------------------------

WORKDIR /tmp
ADD Gemfile* ./

RUN apk add --virtual \
        build-deps \
        build-base \
        openssl-dev \
        libc-dev \
        linux-headers \
        libxml2-dev \
        libxslt-dev \
        readline-dev \
    && bundle install --jobs=2 \
    && apk del build-deps;

# ------------------------------------------------------------------------------
# Copy application into the container
# ------------------------------------------------------------------------------

COPY . /app
WORKDIR /app

# ------------------------------------------------------------------------------
# Publish ENV vars
# ------------------------------------------------------------------------------

ENV RAILS_ENV=production \
    RACK_ENV=production

# ------------------------------------------------------------------------------
# Expose port
# ------------------------------------------------------------------------------

EXPOSE 3000

# ------------------------------------------------------------------------------
# Run puma
# ------------------------------------------------------------------------------

CMD ["bundle", "exec", "puma", "-C", "config/puma.rb"]

CODE