old_contents: import os
  from django.core.exceptions import ImproperlyConfigured
  import ast
  import requests
  import sys
  from settings import *
  
  def get_env_variable(var_name):
      msg = "Set the %s environment variable"
      try:
          return os.environ[var_name]
      except KeyError:
          error_msg = msg % var_name
          raise ImproperlyConfigured(error_msg)
  
  MODE = get_env_variable('DJANGO_MODE') #options are either "PROD" or "DEV" (installing with Dev mode set, get's you extra dependencies)
  DEBUG = ast.literal_eval(get_env_variable('DJANGO_DEBUG'))
  
  STATICFILES_DIRS = STATICFILES_DIRS + (
      os.path.join(get_env_variable('WEB_ROOT'), 'ENV', 'lib', 'python2.7', 'site-packages', 'arches', 'app', 'media'),
  )
  
  DATABASES = {
      'default': {
          'ENGINE': 'django.contrib.gis.db.backends.postgis',
          'NAME': get_env_variable('PGDBNAME'),
          'USER': 'postgres',
          'PASSWORD': get_env_variable('PGPASSWORD'),
          'HOST': get_env_variable('PGHOST'),
          'PORT': get_env_variable('PGPORT'),
          'POSTGIS_TEMPLATE': 'template_postgis_20',
      }
  }
  
  ELASTICSEARCH_HOSTS = [
      { 'host': get_env_variable('ESHOST'), 'port': get_env_variable('ESPORT') }
  ]
  
  MAPBOX_API_KEY = get_env_variable('MAPBOX_API_KEY')
  
  
  ALLOWED_HOSTS = get_env_variable('DOMAIN_NAMES').split()
  
  # Fix for AWS ELB returning false bad health: ALLOWS_HOSTS did not allow ELB's private ip
  EC2_PRIVATE_IP = None
  try:
      EC2_PRIVATE_IP = requests.get('http://169.254.169.254/latest/meta-data/local-ipv4', timeout=0.01).text
  except requests.exceptions.RequestException:
      pass
  if EC2_PRIVATE_IP:
      ALLOWED_HOSTS.append(EC2_PRIVATE_IP)
  EC2_PUBLIC_HOSTNAME = None
  try:
      EC2_PUBLIC_HOSTNAME = requests.get('http://169.254.169.254/latest/meta-data/public-hostname', timeout=0.01).text
  except requests.exceptions.RequestException:
      pass
  if EC2_PUBLIC_HOSTNAME:
      ALLOWED_HOSTS.append(EC2_PUBLIC_HOSTNAME)
new_contents: import os
  from django.core.exceptions import ImproperlyConfigured
  import ast
  import requests
  import sys
  from settings import *
  
  def get_env_variable(var_name):
      msg = "Set the %s environment variable"
      try:
          return os.environ[var_name]
      except KeyError:
          error_msg = msg % var_name
          raise ImproperlyConfigured(error_msg)
  
  MODE = get_env_variable('DJANGO_MODE') #options are either "PROD" or "DEV" (installing with Dev mode set, get's you extra dependencies)
  DEBUG = ast.literal_eval(get_env_variable('DJANGO_DEBUG'))
  
  STATICFILES_DIRS = STATICFILES_DIRS + (
      os.path.join(get_env_variable('WEB_ROOT'), 'ENV', 'lib', 'python2.7', 'site-packages', 'arches', 'app', 'media'),
  )
  
  DATABASES = {
      'default': {
          'ENGINE': 'django.contrib.gis.db.backends.postgis',
          'NAME': get_env_variable('PGDBNAME'),
          'USER': 'postgres',
          'PASSWORD': get_env_variable('PGPASSWORD'),
          'HOST': get_env_variable('PGHOST'),
          'PORT': get_env_variable('PGPORT'),
          'POSTGIS_TEMPLATE': 'template_postgis_20',
      }
  }
  
  ELASTICSEARCH_HTTP_PORT = get_env_variable('ESPORT')
  ELASTICSEARCH_HOSTS = [
      { 'host': get_env_variable('ESHOST'), 'port': ELASTICSEARCH_HTTP_PORT }
  ]
  
  MAPBOX_API_KEY = get_env_variable('MAPBOX_API_KEY')
  
  
  ALLOWED_HOSTS = get_env_variable('DOMAIN_NAMES').split()
  
  # Fix for AWS ELB returning false bad health: ALLOWS_HOSTS did not allow ELB's private ip
  EC2_PRIVATE_IP = None
  try:
      EC2_PRIVATE_IP = requests.get('http://169.254.169.254/latest/meta-data/local-ipv4', timeout=0.01).text
  except requests.exceptions.RequestException:
      pass
  if EC2_PRIVATE_IP:
      ALLOWED_HOSTS.append(EC2_PRIVATE_IP)
  EC2_PUBLIC_HOSTNAME = None
  try:
      EC2_PUBLIC_HOSTNAME = requests.get('http://169.254.169.254/latest/meta-data/public-hostname', timeout=0.01).text
  except requests.exceptions.RequestException:
      pass
  if EC2_PUBLIC_HOSTNAME:
      ALLOWED_HOSTS.append(EC2_PUBLIC_HOSTNAME)
subject: Set existing Elasticsearch port with env variable that confirms to format of other env variables in Dockerfile/docker-compose.yml. Reason: ELASTICSEARCH_HTTP_PORT is also used in other places. re #1650