Example Dockerfile and Compose for Fenrir

docker-compose.yml

version: "3.9"
networks:
  fenrir_user:
services:
  redis:
    image: redis:alpine
    command: redis-server
    ports:
      - 6379:6379
    volumes:
      - redis_data:/data:cached
    logging:
      driver: none
    networks:
      - fenrir_user
    # docker-compose exec redis redis-cli
  nginx:
    image: fenrir_nginx
    restart: always
    build:
      context: .
      dockerfile: ./nginx/Dockerfile.nginx
    depends_on:
      - app
    networks:
      - fenrir_user
    expose:
      - 443
    ports:
      - 80:80
      - 8080:8080
      - 4443:443
    volumes_from:
      - app
  neo4j:
    # When you change the neo4j version, you will need to recrete the volume.
    # `docker volume rm fenrir_neo4j_rspec_data`
    image: neo4j:3.5.27
    ports:
      - 7474:7474 # http://0.0.0.0:7474/
      - 7687:7687 # bolt
    expose:
      - 7474
      - 7687
    volumes:
      - neo4j_app_data:/data
    environment:
      NEO4J_AUTH: none
      # Use the built in neo4j-admin tool on the docker container to get a
      # memory recommendation. Neo4j needs a couple gigs and the ruby app needs
      # 1 or 2 gigs. Docker containers pool their memory together and by default
      # Neo4j is greedy thinking it's being given _all_ of it. Set the memory max
      # to about 3/4 of pooled memory.
      # `neo4j-admin memrec --memory=6g`
      NEO4J_dbms_memory_heap_initial__size: 3g
      NEO4J_dbms_memory_heap_max__size: 3g
      NEO4j_dbms_memory_pagecache_size: 1g
    restart: on-failure
    networks:
      - fenrir_user
    healthcheck:
      test: wget http://localhost:7474 || exit 1
      interval: 1s
      timeout: 10s
      retries: 20
      start_period: 3s
  app:
    build: .
    image: fenrir_app
    command: tail -F init.sh
    # command: bundle exec unicorn -c /vagrant/fenrir/config/unicorn.rb
    volumes:
      - .:/vagrant/fenrir:cached
      - /var/sockets
    ports:
      - 3000:3001
    env_file:
      - .env.local
    depends_on:
      redis:
        condition: service_started
      neo4j:
        condition: service_healthy
      elastic:
        condition: service_started
    environment:
      REDIS_URL: redis://redis:6379
      ELASTICSEARCH_URL: elastic:9200
      NEO4J_URL: http://neo4j:7474
      # development, development_remote, staging, staging_remote, production
      RAILS_ENV: localhost
    networks:
      - fenrir_user
  elastic:  # 2.4.6
    image: elasticsearch:2.4.6
    ports:
      - 9200:9200
      - 9300:9300
    expose:
      - 9200
      - 9300
    environment:
      # To run the Elasticsearch 7 Docker image in development mode, you should
      # set discovery.type to single-node. At startup, the bootstrap checks are
      # bypassed. The single node will elect itself as the master node and will
      # not join a cluster with any other node.
      - xpack.security.enabled=false
      - discovery.type=single-node
      # - xpack.monitoring.enabled=false
      # - xpack.graph.enabled=false
      # - xpack.watcher.enabled=false
    ulimits:
      memlock:
        soft: -1
        hard: -1
      nofile:
        soft: 65536
        hard: 65536
    cap_add:
      - IPC_LOCK
    logging:
      driver: none
    volumes:
      - elasticsearch-data:/usr/share/elasticsearch/data
    networks:
      - fenrir_user

volumes:
  redis_data:
  neo4j_app_data:
  elasticsearch-data:
    driver: local

# docker-compose up --detach

Dockerfile

##########==============================##########
from ruby:2.4.10 AS ruby-base
##########==============================##########

# install bundler version that matches Gemfile
RUN gem install bundler -v '1.17.3'

# throw errors if Gemfile has been modified since Gemfile.lock
# RUN bundle config --global frozen 1

WORKDIR /vagrant/fenrir

# Pre-install large gems early in dockerfile stack to make `bundle install`
# command faster
RUN gem install nokogiri -v '1.10.10'
RUN gem install mimemagic -v '0.3.9'
RUN gem install sassc -v '2.4.0'

# Update Debian repository information and all installed packages
RUN apt-get update

##########==============================##########
FROM ruby-base AS oracle-install
##########==============================##########

# Silence debconf frontend warnings
# RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
ENV DEBIAN_FRONTEND=noninteractive

# Install Oracle Instant Client necessary packages
# RUN apt-get install -y apt-utils
# RUN apt-get install -y build-essential
RUN apt-get install -y libpq-dev
RUN apt-get install -y libaio1
RUN apt-get install -y alien
RUN apt-get install -y unixodbc-dev
RUN apt-get install -y libc6
RUN mkdir /opt/oracle

# Install ruby-odbc gem
RUN gem install ruby-odbc -v '0.999991'

# Instant Client
ADD https://download.oracle.com/otn_software/linux/instantclient/211000/oracle-\
instantclient-basic-21.1.0.0.0-1.x86_64.rpm /opt/oracle/
RUN alien -i --scripts /opt/oracle/oracle-instantclient-basic-21.1.0.0.0-1.x86_64.rpm

# SDK
ADD https://download.oracle.com/otn_software/linux/instantclient/211000/oracle-\
instantclient-devel-21.1.0.0.0-1.x86_64.rpm /opt/oracle
RUN alien -i --scripts /opt/oracle/oracle-instantclient-devel-21.1.0.0.0-1.x86_64.rpm

# SqlPlus
ADD https://download.oracle.com/otn_software/linux/instantclient/211000/oracle-\
instantclient-sqlplus-21.1.0.0.0-1.x86_64.rpm /opt/oracle
RUN alien -i --scripts /opt/oracle/oracle-instantclient-sqlplus-21.1.0.0.0-1.x86_64.rpm

# Install ruby-oci8 gem
# RUN cd /opt/oracle/instantclient_21_1 && ln -s libclntsh.so.12.1 libclntsh.so
# ENV LD_LIBRARY_PATH /usr/lib/oracle/21/client64/lib/
ENV NLS_LANG American_America.UTF8
RUN gem install ruby-oci8 -v '2.2.9'

# Copy .ora config files and set system variables
COPY config/ldap.ora /usr/lib/oracle/21/client64/lib/network/admin
COPY config/sqlnet.ora /usr/lib/oracle/21/client64/lib/network/admin
ENV TNS_ADMIN /usr/lib/oracle/21/client64/lib/network/admin
ENV ORACLE_HOME /usr/lib/oracle/21/client64/lib/
RUN chmod 755 /usr/lib/oracle/21/client64/lib/network/admin/*
ENV PATH="/usr/lib/oracle/21/client64/bin:${PATH}"

##########==============================##########
FROM oracle-install AS app-install
##########==============================##########

# copy ruby version and Gemfile later in the docker build
COPY .ruby-version Gemfile Gemfile.lock ./

# specify which and where the Gemfile is
ENV BUNDLE_GEMFILE /vagrant/fenrir/Gemfile

# install gems
RUN bundle install

# expose unicorn and nginx ports
EXPOSE 3001 4443 443

# rails uses a pid folder
RUN mkdir /tmp/pid
# unicorn uses a socket
RUN mkdir /var/sockets


# ENTRYPOINT ["/bin/bash"]
# CMD ["rails", "server", "-b", "0.0.0.0", "-p", "3000"]