AWS

ICYMI: five updates you’ve missed about Serverless Step Functions

Over the last 6 months, we have made the Serverless Step Functions plugin better and more useful. Here are the most impactful changes, in case you missed it! Support for intrinsic function One of the main pain points of using the plugin has long been that you needed to use fully-formed ARNs. As of v1.18.0 …

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A self-healing Kinesis function that adapts its throughput based on performance

I spent time with a client this week to solve an interesting problem – to adjust the number of concurrent requests to a downstream service dynamically based on response time and error rate. This is a common challenge when integrating with third parties, so we decided to share our approach so others might benefit from …

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AWS SAM + Cloudformation macros, a patch made in heaven

Over the last few weeks I have been working with a very ambitious client – Solve, who is building a new murder mystery game. They are doing some really cool things technically, and are building an entirely serverless stack. While working with Solve I have spent a lot of time with AWS SAM. That experience …

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How to include Serverless Repository apps in serverless.yml

Over the past year, the Serverless Application Repository (SAR) service has improved a lot. I have grown to enjoy it more and more, and have contributed a few applications myself: lambda-janitor: cron job to delete old, unused versions of all Lambda functions in the region to free up storage space. auto-subscribe-log-group-to-arn: subscribes new and existing …

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CloudFormation protip: use !Sub instead of !Join

Update 12/05/2019: as Moshe pointed out in the comments, Fn::Sub is not supported by the Serverless framework because it too uses the ${} syntax to support its own variables system. However, as is often the case with the Serverless framework, you can work around this issue with a plugin. Check out the serverless-cloudformation-sub-variables plugin which …

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Using CloudWatch and Lambda to implement ad-hoc scheduling

A while back I wrote about using DynamoDB TTL to implement ad-hoc scheduling. It generated some healthy debate and a few of you have mentioned alternatives including using Step Functions. So let’s take a look at some of these alternatives, starting with the simplest – using a cron job. We will assess this approach using the …

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Introducing… CloudFormation extrinsic functions ;-)

Ok, ok, AWS hasn’t announced a whole new class of intrinsic functions for you to use in CloudFormation. But if you’re using the Serverless framework then I have a treat for you :-) I created a plugin for the Serverless framework that lets you use a number of custom Fn:: functions in your serverless.yml. The …

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New course on AWS Step Functions!

It’s been a while coming, but I’m excited to announce that my new course – Complete guide to AWS Step Functions – is now live! You can browse the curriculum and purchase the course here. The first two chapters are free to everyone. The course is approximately 2 hours in length and covers everything you need …

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Comparing Nuclio and AWS Lambda

With serverless, you delegate the responsibility of running your infrastructure to a platform provider as much as possible. This frees your engineers to focus on building what your customers want from you—the features that differentiate your business from your competitors’. For this philosophy to work, however, the platform needs to not only give you the …

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Just how expensive is the full AWS SDK?

If you’re not familiar with how cold start works within the context of AWS Lambda, then read this post first. update 24/03/2019: the tests include WebPack as well. When a Node.js Lambda function cold starts, a number of things happen: the Lambda service has to find a server with enough capacity to host the new …

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