Glossary · Phase 11 · Professional practice
Gunicorn
A production web server for Python apps that speak WSGI, such as Flask apps, running several worker processes at once.
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Whichever you pick, rollback should be one action.
Learn it properly
Containers and deployment · Package an app as an image, configure it with the environment, and roll out safely. About 45 minutes.
Other terms from the same lesson
- blue-green deployment: Running a full new copy beside the old one, then switching all traffic at once, with instant rollback.
- canary release: Sending a small share of traffic to a new version first, to catch problems before everyone gets it.
- container image: A read-only package of an app with its system files and libraries, run as an isolated container.
- Dockerfile: A recipe of instructions that builds a container image, one layer per instruction.
- readiness check: Health checks a platform makes: liveness asks whether to restart the app; readiness asks whether to send it traffic.
- twelve-factor app: A set of practices for web services, such as reading configuration from environment variables so one image runs everywhere.
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