Samuel Spencer LegoStormtroopr

Handling AWS-ELB terminating a healthy django instance when accessed from an invalid hostname

When spinning up a new service, Amazon Elastic LoadBalancer needs to check if the service is live and running. This check is done from an IP (from any IP in a private IP range) to the service, this is done by the ELB just doing a simple GET request to a specified path, with no host information - for example GET /heatbeat.

If this instance is a Django service, regardless of the page accessed, this call will fail as in a properly setup Django it is very unlikely that the IP will be in Django's settings.ALLOWED_HOSTS settings.

There are two ways around this, either:

a. Add every IP from every private IP range into your Django project's ALLOWED_HOSTS settings

For more info see: www.kidstrythisathome.com/2016/08/generic-model-autocomplete-with-dal3.html

	import boto3
	import os
	import requests

	from botocore.auth import SigV4Auth
	from requests_aws4auth import AWS4Auth
	from elasticsearch import RequestsHttpConnection


	class AWSRequestsHttpConnection(RequestsHttpConnection):

	# Lets run on the new infrastructure
	sudo: false

	language: python
	python:
	- "3.5"

	install:
	- pip install tox codecov coveralls

	import copy_reg


	from django.db.models.fields import Field, _load_field, _empty

	def _load_field_for_abstract(model, field_name):
	return model._meta.get_field(field_name)

	def view_historic_reversion(request, iid, vid):
	item = get_object_or_404(MDR._concept, pk=iid).item
	if not user_can_view(request.user, item):
	if request.user.is_anonymous():
	return redirect(reverse('friendly_login') + '?next=%s' % request.path)
	else:
	raise PermissionDenied

	old_item = default_revision_manager.get_for_object_reference(
	item.__class__,

	# Released as GPL.
	# Attribute where possible :)

	from haystack.constants import DEFAULT_ALIAS
	from haystack import connections
	class TokenSearchForm(SearchForm):
	def prepare_tokens(self):
	try:
	query = self.cleaned_data.get('q')
	except:

	<?xml version="1.0"?>
	<ddi:DDIInstance xmlns:ddi="ddi:instance:3_1" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:sqbl="sqbl:1"
	xmlns:a="ddi:archive:3_1" xmlns:r="ddi:reusable:3_1" xmlns:xhtml="http://www.w3.org/1999/xhtml"
	xmlns:d="ddi:datacollection:3_1" xmlns:l="ddi:logicalproduct:3_1" xmlns:c="ddi:conceptualcomponent:3_1"
	xmlns:ds="ddi:dataset:3_1" xmlns:s="ddi:studyunit:3_1" xmlns:g="ddi:group:3_1"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="x0" version="0.0.1"
	agency="com.kidstrythisathome.ddirepo.legostormtroopr">
	<g:ResourcePackage id="x1">
	<g:Purpose id="x2">
	<r:Content />

	import sys
	from lxml import etree
	from PyQt4 import QtCore, QtGui

	class editor(QtGui.QMainWindow):
	def __init__(self):
	super(editor, self).__init__()
	self.text = QtGui.QTextEdit()
	self.setCentralWidget(self.text)
	self.text.textChanged.connect(self.validate)

	<span class="face">
	<i class="fg fa fa-user"></i>
	</span>