Dane Hillard Web Application Developer, ITHAKA Twitter / easyaspython GitHub / daneah 

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Zappa 

Serverless Django with Zappa 

Miserlou/Zappa 

Miserlou/Zappa A tool for serverless AWS deployment of Python applications 

Miserlou/Zappa A tool for serverless AWS deployment of Python applications 

Overview ● Server ● Less ● AWS ● Deployment 

Server 

Server Request Response 

Server nginx gunicorn Django assets cert Django Django database 

load balancer 

Less 

nginx gunicorn Django Assets cert Request Response database 

nginx gunicorn Django Assets cert Request Response database 

nginx gunicorn Django Assets ACM Request Response database 

nginx gunicorn Django Assets ACM Request Response database 

nginx gunicorn Django Assets ACM Request Response database 

nginx gunicorn Django S3 ACM Request Response database 

nginx gunicorn Django S3 ACM Request Response database 

nginx gunicorn Django S3 ACM Request Response database 

API gateway Lambda Django S3 ACM Request Response database 

API gateway Lambda Django S3 ACM Request Response database 

API gateway Lambda Django S3 ACM Request Response database Lambda Lambda Django Django 

AWS 

AWS Certificate Manager bestpuppers.com *.bestpuppers.com Zappa arn:aws:acm:us-east-1:...:certificate/... Still available 

Simple Storage Service (S3) Zappa S3 bucket best-puppers 

Lambda WSGI Django WSGI Django WSGI Django 

API Gateway stage production 

AWS recap ● ACM for SSL certs ● S3 for static file storage ○ (CloudFront for CDN!) ● Lambda for request workers ● API Gateway for routing 

Deployment 

The setup zappa init and zappa_settings.json 

zappa init $ tree . ├── bestpuppers │ ├── __init__.py │ ├── settings.py │ ├── urls.py │ └── wsgi.py └── manage.py 1 directory, 5 files $ cat ~/.aws/credentials [bestpuppers] aws_access_key_id = ... aws_secret_access_key = ... $ pip install zappa $ zappa init 

What happens: ● Detect application type (Django, Flask, etc.) ● Create S3 bucket ● Create zappa_settings.json 

zappa_settings.json { “staging”: { “aws_region”: “us-east-1”, “django_settings”: “bestpuppers.settings”, “profile_name”: “bestpuppers”, “project_name”: “bestpuppers”, “s3_bucket”: “best-puppers”, }, ... } 

First deployment $ zappa deploy staging Calling deploy for stage staging… Downloading and installing dependencies… Packaging project as zip… Uploading zip (4.3MiB)... Creating API Gateway routes… Deploying API Gateway… Your Zappa deployment is live! https://...execute-api.us-east-1.amazonaws.com/staging 

What happens: ● Freeze Python requirements along with application code into a ZIP file ● Upload ZIP file to S3 bucket ● Create API Gateway routes ● Create Lambda function with code from ZIP file ● Hook API Gateway route to Lambda function ● Print URL to visit application 

Updating the application $ zappa update staging Calling update for stage staging… Downloading and installing dependencies… Packaging project as zip… Uploading zip (4.3MiB)... Updating lambda function code... Updating lambda function configuration... Deploying API Gateway... Your updated Zappa deployment is live! https://...execute-api.us-east-1.amazonaws.com/staging 

Certificates { “staging”: { ..., “certificate_arn”: “arn:aws:acm:us-east-1:...:certificate/...” “domain”: “staging.bestpuppers.com” } } $ zappa certify staging 

You also get: ● Log storage and tailing ● Management commands and raw Python in Lambda ● Auto-scaling to meet request load (watch out for concurrency and cold start time) ● Probably a way lower AWS bill! 

Odds and ends ● Serverless database options ○ Aurora serverless is a thing; managed solution, but comparable in cost to RDS for now ○ DynamoDB is a thing; NoSQL solution with no production-ready driver for Django that I know of ● Asynchronous tasks ○ Zappa can run functions on a schedule! ○ Could split into separate application/Lambda and respond to triggers ○ Long-running lambdas aren’t well-supported 

Tips 

exclude unneeded files! coughnode_modulescough 

exclude unneeded files ● node_modules ● .idea/ ● media/ ● Reduces ZIP file size and upload time 

Automate your process! Use a task runner like Fabric or npm scripts 

package.json ..., “scripts”: { “clean”: “rm -rf assets/dist”, “pretest”: “coverage erase”, “test”: “coverage run manage.py test”, “posttest”: “coverage report”, “prebuild”: “npm run clean”, “build”: “webpack”, “build:prod”: “NODE_ENV=production npm run build -- -p --progress”, “prestart”: “npm run clean”, “start”: “webpack --watch”, “predeploy”: “npm run build:prod && npm run test”, “deploy:migrate”: “zappa manage $npm_config_stage migrate”, “deploy:static”: “zappa manage $npm_config_stage ‘collectstatic --noinput’”, “deploy”: “zappa update $npm_config_stage”, “postdeploy”: npm run deploy:migrate && npm run deploy:static” } 

npm scripts $ npm run deploy --stage=production 

Thanks! Find me in the hall for a demo 

Dane Hillard Web Application Developer, ITHAKA Twitter / easyaspython GitHub / daneah