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 …
How to include Serverless Repository apps in serverless.yml Read More »
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 …
Using CloudWatch and Lambda to implement ad-hoc scheduling Read More »
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 …
Introducing… CloudFormation extrinsic functions ;-) Read More »
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 …
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 …
CloudWatch Events let you easily create cron jobs with Lambda. However, it’s not designed for running lots of ad-hoc tasks, each to be executed once, at a specific time. The default limit on CloudWatch Events is a lowly 100 rules per region per account. It’s a soft limit, so it’s possible to request a limit …
I recently watched an excellent talk by Matt Lavin on optimization tips for Lambda and saw a slide on making DynamoDB use HTTP keep-alive. It reminded me of a conversation I had with Sebastian Cohnen, so I set out to test the effect this simple optimization has. What is it all about? As it turns …
Lambda optimization tip – enable HTTP keep-alive Read More »
The Register published an article right before Christmas 2018. It talks about inflated serverless costs, but it largely misses the point and focuses on the wrong workloads. The whitepaper the article refers to provides some interesting analysis. However, the case studies it used to make its point are not representative of what most developers do. …
You are thinking about serverless costs all wrong Read More »
As we approach the completion of my video course Production-Ready Serverless, I have also delivered the course in a classroom setting with both SimplyBusiness and the DVLA in the UK. In the coming months, I will also be running public workshops at various conferences and user groups: AWS User Group 17th Oct @ The Telegraph, London (sold …
Production-Ready Serverless is coming to a workshop near you! Read More »
In my last post we talked about how we can implement semaphores with Step Functions. Another common scenario that many people have is to handle errors from a block of states like we’re used to with a try-catch block. try { step1() step2() step3() } catch (States.Timeout) { … } catch (States.ALL) { … } …
Step Functions : apply try-catch to a block of states Read More »
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