Understanding the need for demarcation
Typically, when we talk about demarcation in cloud models, we refer to the matrix or delineation of responsibility: who's responsible for what in IaaS, PaaS, and SaaS computing? The following diagram shows the very basics of this matrix:
However, we need a much more granular model in multi-cloud. We have been discussing policies throughout this chapter and by now, we should have concluded that it's not very easy to draw some very sharp lines when it comes to responsibilities in our multi-cloud environment. Just look at the solution stack – even in SaaS solutions, there might be certain security and/or compliancy policies that the solution needs to adhere to. Even something such as an operating system might already be causing issues in terms of hardening: are monitoring agents from a PaaS provider allowed or not? Can we run them alongside our preferred monitoring solution...
