Presentation from Django User Group London, June 2017 How to run Django on AWS Lambda - with demo of getting a hello world deployed in less than 10 minutes

1. Django and AWS
Lambda
Malcolm Box
malcolm.box@gmail.com
Sometimes: @malcolmbox
Very occasionally: https://attentionshard.wordpress.com

2. About me
• Working with Django since 2009 (Django 1.1)
• CTO of Tellybug where we made apps for TV
shows and a very scalable platform using Django
& AWS
• Recently started building a new project using
serverless
• Consulting CTO working with startups

3. “AWS Lambda is a compute service that
lets you run code without provisioning or
managing servers”

5. Data Centre
Server
Linux
nginx
gunicorn
Django
def view(request):
return
render(request,
"demo.html")
*Not to scale

6. https://github.com/Miserlou/Zappa

7. Demo!
• You will need:
• AWS Credentials
• A python virtualenv
• Instructions and example code:
https://github.com/mbox/djugl-demo

8. Other Zappa goodness
$ zappa tail
Calling tail for stage demo..
[1497350426182] [DEBUG] 2017-06-13T10:40:26.182Z b55a7b0b-5024-11e7-8e46-47e2239fb3ce Zappa Event: {u'body': None, u'resource':
u'/', u'requestContext': {u'resourceId': u'gm6q48zq93', u'apiId': u'lkvzkzlzd6', u'resourcePath': u'/', u'httpMethod': u'GET', u'requestId':
u'b54d0e51-5024-11e7-b059-6324c1a6f402', u'path': u'/demo', u'accountId': u'956653133436', u'identity': {u'apiKey': u'', u'userArn': None,
u'cognitoAuthenticationType': None, u'accessKey': None, u'caller': None, u'userAgent': u'python-requests/2.17.3', u'user': None,
u'cognitoIdentityPoolId': None, u'cognitoIdentityId': None, u'cognitoAuthenticationProvider': None, u'sourceIp': u'82.3.163.138', u'accountId':
None}, u'stage': u'demo'}, u'queryStringParameters': None, u'httpMethod': u'GET', u'pathParameters': None, u'headers': {u'Via': u'1.1
2e578cf3c3154a7d5d4f253d74c2b940.cloudfront.net (CloudFront)', u'Accept-Encoding': u'gzip, deflate', u'CloudFront-Is-SmartTV-Viewer':
u'false', u'CloudFront-Forwarded-Proto': u'https', u'X-Forwarded-For': u'82.3.163.138, 54.182.244.97', u'CloudFront-Viewer-Country': u'GB',
u'Accept': u'*/*', u'User-Agent': u'python-requests/2.17.3', u'X-Amzn-Trace-Id': u'Root=1-593fc118-7e2199041b9cd95f3abfe753', u'Host':
u'lkvzkzlzd6.execute-api.eu-west-1.amazonaws.com', u'X-Forwarded-Proto': u'https', u'X-Amz-Cf-Id': u'1Cn8Ygt_ftJmfKnGiNqCTOO2SNT-
gcNigAY0DXARyP2O500N8oEZGQ==', u'CloudFront-Is-Tablet-Viewer': u'false', u'X-Forwarded-Port': u'443', u'CloudFront-Is-Mobile-Viewer':
u'false', u'CloudFront-Is-Desktop-Viewer': u'true'}, u'stageVariables': None, u'path': u'/', u'isBase64Encoded': False}
[1497350426184] Invalid HTTP_HOST header: 'lkvzkzlzd6.execute-api.eu-west-1.amazonaws.com'. You may need to add u'lkvzkzlzd6.execute-
api.eu-west-1.amazonaws.com' to ALLOWED_HOSTS.
[1497350426184] [ERROR] 2017-06-13T10:40:26.183Z b55a7b0b-5024-11e7-8e46-47e2239fb3ce Invalid HTTP_HOST header:
'lkvzkzlzd6.execute-api.eu-west-1.amazonaws.com'. You may need to add u'lkvzkzlzd6.execute-api.eu-west-1.amazonaws.com' to
ALLOWED_HOSTS.
[1497350426341] [INFO] 2017-06-13T10:40:26.341Z b55a7b0b-5024-11e7-8e46-47e2239fb3ce 82.3.163.138 - - [13/Jun/2017:10:40:26 +0000]
"GET / HTTP/1.1" 400 37968 "" "python-requests/2.17.3" 0/158.477

9. zappa manage
$ zappa manage demo migrate
START RequestId: da3e8e84-5039-11e7-9c38-2913a464f8e0 Version: $LATEST
Operations to perform:
Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
No migrations to apply.
END RequestId: da3e8e84-5039-11e7-9c38-2913a464f8e0
REPORT RequestId: da3e8e84-5039-11e7-9c38-2913a464f8e0Duration: 386.42 msBilled Duration: 400 ms
Memory Size: 512 MB Max Memory Used: 52 MB

10. zappa schedule

11. Asynchronous Task
Execution
from flask import Flask
from zappa.async import task
app = Flask(__name__)
@task
def make_pie():
""" This takes a long time! """
ingredients = get_ingredients()
pie = bake(ingredients)
deliver(pie)
@app.route('/api/order/pie')
def order_pie():
""" This returns immediately! """
make_pie()
return "Your pie is being made!"

12. Going further
• Database - can use RDS, Dynamo, Redshift etc
• GeoDjango & binary libraries - issues if they get
too big
• Python 3 - now supported
• Static files - use Whitenoise
http://whitenoise.evans.io

13. Thank you!