CloudFormation

Why you should use temporary stacks when you do serverless

One of the benefits of serverless is the pay-per-use pricing model you get from the platform. That is, if your code doesn’t run, you don’t pay for them! Combined with the simplified deployment flow (compared with applications running in containers or VMs) it has enabled many teams to make use of temporary CloudFormation stacks. In …

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How to use the power of CloudFormation custom resources for great good

Disclaimer: if you’re new to CloudFormation custom resources, then I recommend you start by reading this excellent post by Alex Debrie first. Custom resources bring a whole new dimension to CloudFormation and enable some fascinating use cases. For example: provision DataDog dashboards as part of your CloudFormation stack run a load test every time you …

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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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