Serverless Workflows on AWS: My Journey From SWF to Step Functions

AWS Lambda functions can only run for a maximum of five minutes. This must be distinctly understood, or nothing wonderful can come of the story you are about to hear.

The Problem

This past summer, my team and I set out to build an internal software system used for deployment testing on AWS. The application would run a large number of workflow executions in parallel each night and might perform a few one-off executions during the day – maybe six hours total use out of every twenty-four, with only a small fraction of that time spent doing actual compute tasks. Trying to scale, manage and spend money on EC2 instances for that workload didn’t interest us. We wanted to run our whole workflow process end-to-end on AWS Lambda.

And we did. Heaven help us, we did. This is our story.

Continue reading “Serverless Workflows on AWS: My Journey From SWF to Step Functions”

Serverless Workflows on AWS: My Journey From SWF to Step Functions

Adventures in AWS: Understanding the Price List API

The AWS Price List API

In December 2015, AWS announced a new Price List API that exposes access to current prices for several of their products, including EC2 and RDS. If you’re thinking about building some automation to track AWS spend, and you’re used to working with AWS’s generally marvelous APIs and language SDKs, this sounds like great news. At least, that’s what I thought when I sat down last week to build a tool that would track cost savings for stopped EC2 instances in some of my company’s AWS environments.

Let’s just say the Price List API didn’t match my initial expectations. In fact, calling it an “API” is a bit generous; basically it’s a giant JSON or CSV file you can download for various AWS services that contains price and product data indexed by SKU.

What’s a SKU, you ask? The short answer is it’s a “Stock Keeping Unit“; the even shorter answer is that it doesn’t matter, because nowhere else in the AWS API ecosystem are SKUs for individual resources made available, so you’re not going to be cross-referencing them with anything else. But don’t despair; it is in fact possible to automate price lookups inside the AWS Price List data dump. Let me walk you through the approach I used.

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Adventures in AWS: Understanding the Price List API

Lambda calculus: talking Serverless with Florian Motlik

The open source Serverless project, which currently has nearly 10,000 stars on Github, provides tooling around AWS’s “Function as a Service” ecosystem that includes Lambda and API Gateway. I recently had the opportunity to chat with Florian Motlik, CTO of Serverless, about his thoughts on serverless architectures and the future of the Serverless framework.

The following interview has been edited and condensed. 

Forrest: Although AWS Lambda is less than two years old, we’re already seeing a robust tooling ecosystem appear around it, including the Serverless Framework. How did the Serverless project get started?

HeadshotFlorian: Austen Collins, our founder, started Serverless about a year ago. In his previous life as a consultant, he worked with AWS Lambda while building various applications. Austen saw two things about Lambda that made a huge difference for him. First, it enables you to build applications without having to maintain infrastructure. And as someone who had to maintain infrastructure in the past, he saw that was a really interesting direction for the industry to go. Second, Lambda enables an event-driven architecture, where you just react to events that can be fired from anywhere to anywhere. Austen also saw that although Lambda was very powerful, its lack of tooling made it hard for new users to get started. So, about a year ago he started building the Serverless framework. The project took off right away, and towards the end of last year, he decided that this is not just an open source framework; it’s something we can build a company around. So that’s when I was brought on as the CTO to lead our engineering team, and we grew from there.

Continue reading “Lambda calculus: talking Serverless with Florian Motlik”

Lambda calculus: talking Serverless with Florian Motlik

Invoke Pester Tests Serverlessly with AWS Lambda and SSM

Pester and CI

If you’re doing Windows scripting in 2016, you’d better be using PowerShell. And if you’re writing PowerShell scripts, you’d better be checking them into source control and covering them with Pester tests.

It turns out that you can do more with Pester than just run tests manually at the console. As part of a continuous integration (CI) process, you may want to invoke Pester tests on a remote server and report the results up through the build chain. Handily, you can export Pester test output in an NUnit XML format that modern CI systems like Jenkins understand.

But what if you’re not using a build server to invoke Pester? What if your CI setup is … dun dun dun … “serverless”?

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Invoke Pester Tests Serverlessly with AWS Lambda and SSM