Classic Ruby Dockerfile & Docker Compose

docker-compose.yml

version: '3.5'
services:
  postgres:
    image: postgres:11
    environment:
      POSTGRES_USER: example_user
      POSTGRES_PASSWORD: example_pass
      POSTGRES_DB: example
    volumes:
      - ./postgres-data:/var/lib/postgresql/data
    ports:
      - 42001:5432
    restart: unless-stopped

  elasticsearch:
    image: elasticsearch:5.6.16
    environment:
      - cluster.name=elasticsearch
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    command: "elasticsearch -E 'http.port=9333' -E 'transport.tcp.port=9200'"
    ports:
      - 42002:9333
    volumes:
      - ./elasticsearch-data:/usr/share/elasticsearch/data
    restart: unless-stopped

  redis:
    image: redis
    ports:
      - 42003:6379
    restart: unless-stopped

Dockerfile

FROM ubuntu:20.04

ENV TZ=America/Los_Angeles
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

RUN useradd -s /usr/bin/bash -d /home/deployer -m deployer
RUN mkdir /app
RUN chown deployer /app

RUN apt-get update && apt-get install -y \
    autoconf bison build-essential libssl-dev libyaml-dev \
    libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev \
    libgdbm6 libgdbm-dev libdb-dev git \
    imagemagick libxml2-dev libxslt-dev wget curl \
    && rm -rf /var/lib/apt/lists/*


ENV NODE_VERSION v13.12.0
RUN curl -ksSLO https://nodejs.org/dist/$NODE_VERSION/node-$NODE_VERSION-linux-x64.tar.gz && \
    tar -C /usr/local --strip-components 1 -xzf node-$NODE_VERSION-linux-x64.tar.gz && \
    rm node-$NODE_VERSION-linux-x64.tar.gz

# Postgres client
RUN cd /usr/src && \
    wget https://ftp.postgresql.org/pub/source/v11.12/postgresql-11.12.tar.gz && \
    tar xvf postgresql-11.12.tar.gz && \
    cd postgresql-11.12 && \
    ./configure --prefix=/opt/postgresql-11.12 && \
    make -j$(nproc) && \
    make install


# Get Openssl for Ruby
RUN cd /usr/src && \
    wget https://www.openssl.org/source/old/1.0.2/openssl-1.0.2u.tar.gz && \
    tar -zxvf openssl-1.0.2u.tar.gz && \
    cd openssl-1.0.2u && \
    ./config --prefix=/opt/openssl-1.0 shared && \
    make -j$(nproc) && \
    make install && \
    curl -sSL -o /opt/openssl-1.0/ssl/cert.pem https://curl.se/ca/cacert.pem && \
    mkdir -p /usr/share/ca-certificates && \
    curl -sSL -o /usr/share/ca-certificates/cacert.pem https://curl.se/ca/cacert.pem

# Get Ruby 2.3.8
RUN cd /usr/src && \
    wget https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.8.tar.gz && \
    tar xvf ruby-2.3.8.tar.gz && \
    cd ruby-2.3.8/ && \
    ./configure --prefix=/opt/ruby-2.3.8 --with-openssl-dir=/opt/openssl-1.0 && \
    make -j$(nproc) && \
    make install

RUN chown -R deployer:deployer /opt/ruby-2.3.8/bin /opt/ruby-2.3.8/lib/ruby/gems

USER deployer
WORKDIR /app
ADD --chown=deployer:deployer Gemfile /app/
ADD --chown=deployer:deployer Gemfile.lock /app/

ENV PATH=/opt/ruby-2.3.8/bin:/opt/postgresql-11.12/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

RUN gem install bundler -v 1.17.2 --no-rdoc --no-ri
RUN bundle install

ADD --chown=deployer:deployer Rakefile    /app/Rakefile
ADD --chown=deployer:deployer app         /app/app
ADD --chown=deployer:deployer config      /app/config
ADD --chown=deployer:deployer config.ru   /app/config.ru
ADD --chown=deployer:deployer db          /app/db
ADD --chown=deployer:deployer lib         /app/lib
ADD --chown=deployer:deployer public      /app/public
ADD --chown=deployer:deployer script      /app/script
ADD --chown=deployer:deployer services    /app/services
ADD --chown=deployer:deployer spec        /app/spec
ADD --chown=deployer:deployer vendor      /app/vendor

EXPOSE 3000

CMD ["rails", "server"]