Does AWS FIS provide the functionality to inject errors into APIs hosted in an EKS cluster, or is it limited to AWS APIs only?

Question

We operate a production EKS cluster that supports numerous microservices. I intend to perform FIS experiments on specific APIs within these microservices, involving actions such as throttling and increasing the load. However, upon inspecting the FIS console, it appears that there are only options for injecting errors into AWS APIs, not custom ones. Does AWS FIS offer the capability to inject errors into APIs hosted in an EKS cluster?

Answer

The [API actions](https://docs.aws.amazon.com/fis/latest/userguide/fis-actions-reference.html#fis-actions-reference-fis) in AWS FIS are specifically for AWS APIs. You should be using the actions that are specifically targeting the infrastructure that you are using to build your APIs, in this case the [EKS actions](https://docs.aws.amazon.com/fis/latest/userguide/fis-actions-reference.html#eks-actions-reference). With those actions you can for instance add [latency and jitter to specific pods](https://docs.aws.amazon.com/fis/latest/userguide/fis-actions-reference.html#pod-network-latency) in your cluster. Depending on your entire architecture including the upstream caller of the API, you could potentially also use other actions.

Does AWS FIS provide the functionality to inject errors into APIs hosted in an EKS cluster, or is it limited to AWS APIs only?

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