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REFERENCE NOTES

Setup steps

  • make django project
  • install django-zappa, add to INSTALLED_APPS and MIDDLEWARE
  • add ZAPPA_SETTINGS to settings.py
  • manage.py deploy dev

Static assets

  • install django-storages
  • set DEFAULT_FILE_STORAGE = 'libs.storages.S3Storage.S3Storage'
  • set STATIC_URL to your S3 bucket and add settings params for AWS credentials
  • run manage.py collectstatic

Database setup

  • setup RDS instance
  • configure lambda function to run on same VPC as the database
  • punch hole in VPC to allow local connections to database
  • manage.py migrate from localhost
  • manage.py update dev

General Lambda issues

  • python 2.7 is all that's supported by default
  • shipping precompiled binaries for dependencies is tricky

Django-Zappa issues

  • could only use us-east-1, trying us-west-2 caused problems
  • cannot manage.py shell/dbshell/migrate inside the lambda function
  • cannot have egg-links in site-packages (zappa auto-packages your virtualenv)
  • deploys sometimes include outdated pycs (need to do your own pyc cleanup before deploying)
  • django redirect responses did not respect the /dev SCRIPT_NAME
  • keep_warm doesn't do anything, need to add your own "keep warm" event schedule to Amazon
  • zappa moves settings.py into BASE_DIR, which can break the BASE_DIR calculation
  • failed deploys leave junk zipfiles in repo root

Billing breakdown (small-scale deployment)

  • Lambda: Free for 1M monthly requests or 400,000 RAM GB-seconds of CPU time
  • Postgres: Free t2.micro for 12 months, then ~$13/month
    • Seems worthy to migrate to DynamoDB for a long-term free offering and better bang:buck ratio
  • S3: Free for 12 months, then ~$0.50/month to serve basic static assets (CSS/JS)
  • VPC: ~$30/month if using a NAT gateway to make outbound calls from inside a lambda in a VPC
    • Alternatively, one could move the lambda out of the VPC and take risks with exposing the RDS instance
  • API Gateway: Free for 12 months, then ~$4.00/month to serve 1M API requests
  • Total costs: $0/mo for 12 months, then ~$18/mo for a small app (or $5/mo if using DynamoDB)