sample-docker-compose.yml

---
version: '2'
services:
  oracle:
    image: your_private_registry:oracle-database-12.1.0.2-ee-testdb
    expose:
      - "1521" # Expose database listener to containers
    ports:
      - "5500:5500" # Oracle OEM Express

  # Below is a sample setup for a Ruby/Rails app. May need to adjust to your needs.
  app:
    build: .
    command: /bin/bash docker-start.sh # do nothing
    volumes_from:
      - bundler_cache
    ports:
      - "3000:3000" # Rails server
    environment:
      # needed for wait-for-db.sh
      - ORACLE_PDB=ORCLPDB1
      - ORACLE_PWD=test
      - ORACLE_USER=test
      - ORACLE_HOST=oracle
      # Optional run bundle exec:
      # - BUNDLE_EXEC="some command here"
    links:
      - oracle

  bundler_cache:
    image: yourapp_app # name of above image after docker-compose builds it
    volumes:
      - /bundle
    command: /bin/bash docker-start.sh

# To run Oracle locally, perform these steps:
# `docker pull your_private_registry:oracle-database-12.1.0.2-ee-testdb`
# `docker run --name oracle12c-test -p 1521:1521 --rm -i -t your_private_registry:oracle12c-test-db`
#
# You should have Oracle ready at this point, and can either:
#   1) Run your app on your machine natively.
#   2) Run your app within Docker.
# I recommend #1. It's less complicated. #2 is mainly for CI testing.
# The test-db image does not persist data on your machine, so it's only suitable
# for running tests from clean slate.

# To run all of the images, perform these steps:
# 1) `docker-compose build app`. Make sure you have a build of the app service.
# This is because bundler will be based on the app image which needs to be
# present before itself can be built, and then volume-out the bundler cache.
# 2) `docker-compose up`
# 3) `docker-compose exec app your_command_here`

# Oracle users:
# sysdba | user: sys    pass: oracle
# dba    | user: test   pass: test