Learn how you can leverage spot instances of AWS for cost saving in Kubernetes clusters without compromising on stability. You will know the best possible solution to use spot instances in Kubernetes clusters using mechanisms provided by Kubernetes.
Cost-saving has always been one of the important objectives for organizations, but now it is more important than ever before. Because of the uncertainty in the business world, the earlier motto of "growth at all costs" has been replaced with "responsible growth".
This post will focus on how you can leverage spot instances of AWS for cost saving in Kubernetes clusters without compromising on stability.
You must be thinking that this is trivial as Kubernetes supports it out of the box: hold your thoughts for a while. I promise you, by the end of this post, you will know the best possible solution to use spot instances in Kubernetes clusters using mechanisms provided by Kubernetes.
Spot instances of AWS are usually available at 10% of the cost of on-demand instances, but their reliability is low. If the price of spot instances goes beyond your bidding price, they will be terminated by AWS within 2 mins. Therefore we must distribute pods of our microservice judiciously across spot and on-demand instances.
How to handle termination notification and drain resources? Keep in mind that it is also important to maintain the SLA of microservices but that is beyond the scope of this article. We will cover that in a separate article.
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