Eirini For DevelopersFor Developers there are two big wins from Eirini. Firstly, if you want a Cloud Foundry cluster and you have access to Kubernetes but not VMs, Eirini lets you get it and kick the tires really fast. Secondly when you do need or want to pull the escape hatch and drop down to Kubernetes, everything you’ve cf push-ed is available as native Kubernetes objects under the covers.
Eirini For OperatorsThe big win from Eirini, though, is for Operators. Many platform operators already need to maintain a Kubernetes stack, for the stateless services their Cloud Foundry uses. Today, in order to provide an Easy Switch for developers, those operators need to manage two schedulers (Diego and Kubernetes), and any tooling and monitoring they use needs to be duplicated between the two. Deploying both the Diego and Kubernetes via Bosh can make this a bit better, but it doesn't solve the bulk of the problem. Eirini standardises the underlying infrastructure so it’s all Kubernetes under the covers.
Source: The Fresh Prince of Cloud Native: Bringing Cloud Foundry & Kubernetes Together