docker rails starter

dev-entrypoint.sh

#! /bin/bash

# Include the app's bin directory to $PATH:
export PATH=/usr/src/app/bin:$PATH

set -e

# The container was invoked without any particular command... we must check if is a new development environment, install whatever we need to install, and then run the default command:
if [ -z "$1" ]; then
    
  # Install bundler unless already present.
  # If using the official ruby image with gems in a mounted data volume, 
  # the first run will not find bundler installed.
  which bundle || gem install bundler --version "$BUNDLER_VERSION" --no-rdoc --no-ri

  # Check if the app dependencies are met, or install them - using bundler:
  bundle check || bundle

  # Check if the database is initialized, or else try a database setup:
  rake db:migrate || rake db:setup

  # Set the default command:
  set -- rails s -p 3000 -b 0.0.0.0 "$@"
fi

# Run the given/default command:
exec "$@"

dev-entrypoint2.sh

#! /bin/bash

set -e

# 1: Agregar los binstubs a $PATH:
export PATH=/usr/src/app/bin:$PATH

# 2: Esperar a que algún otro container termine de inicializar
#    los datos comunes (gems compartidos, base de datos)
if [ -z "$APP_SETUP_WAIT" ]; then APP_SETUP_WAIT=5; fi
while [ -f /usr/src/app/tmp/app-setup-is-busy ]
do
  echo "Waiting $APP_SETUP_WAIT seconds for app setup process to finish..."
  sleep $APP_SETUP_WAIT
done

# 3: "Apartar" el proceso de inicialización:
touch /usr/src/app/tmp/app-setup-is-busy

# 4: Checar o Instalar dependencias con Bundler:
bundle check || bundle

# 5: "Liberar" el proceso de inicialización:
rm -rf /usr/src/app/tmp/app-setup-is-busy

if [ -z "$1" ]; then
  set -- ruby service-a.rb "$@"
fi

# ejecutar el comando o el default:
exec "$@"

docker-compose-2.yml

# App gems and configuration:
gems: &app_base
  image: ruby:2.2.3
  volumes: [ ".:/usr/src/app", "/usr/local/bundle" ]
  working_dir: /usr/src/app
  command: "true"

webuno: &app
  <<: *app_base
  volumes_from: [ gems ]
  entrypoint: /usr/src/app/dev-entrypoint.sh
  command: ruby service-a.rb
  ports: [ "4567:4567" ]

webdos:
  <<: *app
  command: ruby service-b.rb
  ports: [ "4568:4567" ]