Articles tagged: Auto Scaling Groups (ASG)

Fear the Chaos Monkey? Think again!

Fear the Chaos Monkey? Think again!

On July 30, 2012, Netflix open sourced the Simian Army, which includes the now world famous Chaos Monkey. That was 3 years ago. For those not familiar, Chaos Monkey is a little service that runs in the background and goes around killing EC2 instances. Yes, that's right:

Chaos Monkey terminates live servers with real users in production.

The question is...

Why is this scary?

Why would I, running a mission critical system, not want to be continuously testing the resiliency of my service? Why would I want to be woken up in the middle of the night by PagerDuty just …


The DOs and DON'Ts of Blue/Green Deployment

The DOs and DON'Ts of Blue/Green Deployment

The term "blue/green deployment" is so misunderstood, we can't even decide on what to call it. Netflix call it Red/Black Deployment, while others call it A/B Deployment. Personally, I don't even know which color represents which thing, but this is only the beginning of the confusion.

So, I thought it might help to get some thoughts out there, have others weigh in, and see if we can't reach some consensus. After all, it's been 5 years since the oracle spoke. :-)

Here goes...

First off, blue/green deployment is the process of having 2 sets of machines, and …


Why you're wasting money on AWS

Why you're wasting money on AWS

What is cheaper than a reserved instance on AWS? How about not running an instance in the first place?

AWS announced a new reserved instance model, designed to save you up to 63% per instance. Most small and mid-sized companies aren’t going to commit for 3 years, so we are looking at something closer to 40% savings. That’s a good start.

However, chances are you are over provisioning - running more and/or larger EC2 instances than you actually need. Let me illustrate this with a few charts. Suppose the traffic to your site follows the usual wave.


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