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Amazon Web Services enterprisedb.com

Is Amazon’s new MongoDB-compatible DBMS really PostgreSQL under the covers?

This is a nice rundown of the technical clues indicating that DocumentDB might be powered by Postgres. PostgreSQL isn’t the only DBMS that scales writes vertically and reads horizontally via replication, but when you add this all up, especially some of the specific limitations, I think it makes a pretty compelling argument that PostgreSQL is the engine powering AWS DocumentDB.

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John Demian dashbird.io

AWS Lambda limitations explained

John Demian lays out Lambda’s runtime environment limitations for your consideration. I gave Lambda a chance to impress me after Pam Selle gave us the hard sell, but I hit up against the 5-minute function execution timeout. Needless to say I was not impressed. It’s nice to see they’ve increased that to 15 minutes, but there are other constraints to consider as well.

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Amazon Web Services awslabs.github.io

Find CloudFormation difficult to work with? Ditch YAML/JSON with AWS Cloud Development Kit (CDK)

The AWS CDK is an infrastructure modeling framework that allows you to define your cloud resources using an imperative programming interface. The CDK is currently in developer preview. We look forward to community feedback and collaboration. If you’re developing for AWS and using CloudFormation, and you feel that YAML and/or JSON templates are too restrictive, CDK will allow you to programmatically define your stack. CDK provides strong typed resources for Java, .Net, and TypeScript, as well as JavaScript support. You can even augment it by creating your own constructs and create your own DSL on top of CloudFormation!

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Cristian Magherusan-Stanciu github.com

Lower your AWS costs (up to 90%!) by automating the use of spot instances

If you’re using EC2 and paying big bucks to do so, you owe it to yourself to check out AutoSpotting: Once installed and enabled by tagging existing on-demand AutoScaling groups, AutoSpotting gradually replaces their on-demand instances with spot instances that are usually much cheaper, at least as large and identically configured to the group’s members, without changing the group configuration in any way. For your peace of mind, you can also keep running a configurable number of on-demand instances given as percentage or absolute number.

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