Build a Flask microservice with OpenFaaS

Build a Flask microservice with OpenFaaS

Learn how to build your project with build a Flask microservice with OpenFaaS - Which is better Flask or serverless-style Python functions? OpenFaaS has several popular Python templates for users including some that use Flask microservice as their underlying technology.

Which is better Flask or serverless-style Python functions? Why not have both?

Introduction

OpenFaaS has several popular Python templates for users including some that use  Flask as their underlying technology. In this post I’ll introduce you to the function-style templates, and then show you how to port a Flask app to OpenFaaS directly through a Dockerfile.

Flask is a HTTP microservices framework for Python.

This post is written for existing OpenFaaS users, if you’re new then you should  try deploying OpenFaaS and following a tutorial to get a feel for how everything works. Why not start with this course?  Introduction to Serverless course by the LinuxFoundation

OpenFaaS workloads and templates

An OpenFaaS workload is a container which serves HTTP on port 8080 and if you’re using autoscaling, it will also need a health endpoint. That means that any container built for Google App Engine, Knative, Cloud run, or another PaaS can be deployed to OpenFaaS without changes. The good news for developers using microservices is that it’s relatively easy to port your service over and get the benefits of OpenFaaS.

See also:  workload definition

We built OpenFaaS to be more flexible and portable than AWS Lambda and Azure functions. We wanted to create something that used containers instead of zip files.

To make containers feel like cloud-FaaS we created a concept of templates that brings back the look and feel of a function, but under the hood these templates are just HTTP servers.

That’s right folks. Serverless has servers.

So let’s first look at  a template built for Python and then how we can build a Docker image for Flask and deploy that directly.

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