sap btp
-------

(formerly sap cloud platform)

sap btp is the platform as a service solution that sap provides, they rent you
hardware operated by cloudfoundry or kyma (this is the OS that will be deployed
in the hw), and you can deploy whatever you want there; they also give you sap
services (sap hana db, sap uaa, etc) which you can connect with the cluster.


overview and arch
=================

Cloudfoundry
------------

TL;DR it provides a huge level of abstraction for the developer to only push
its app and have it running, without having to worry to much about infra.

You install cloudfoundry in all the hw of your cluster. Like installing
`kubelet` in the machines, having an admin, workers and so on. The installation
is out of the scope of this text.

When you push an application to the cluster, cloudfoundry will create a runtime
environment in the cluster for the app to run.  It basically creates a
container that is called "Cell" in this context.

You can also connect SAP services to the cells.

Kyma
----

You deploy k8s in your cluster, kyma is deployed on top k8s, kyma extends the
applications running inside the pods. It gives them monitoring or
authentication, and so on.

kyma gives and "application connector" for the app in your pod to be able to
trigger serverless functions, and connect with 3rd party or SAP services.