Today I'll try to discuss in a few words some important concepts about DevOps. The first is that DevOps is a concept that results in a paradigm change.
Starting as DevOps we need to understand the difference between Greenfield and Brownfield. In a simple view, Greenfield is untouched land, and a Brownfield is the used ground for other purposes. Now you are confused, but don't worry.
Greenfield => New Brownfield => Legacy
But, how about using a bimodal model? For example, we can see in some organizations two or more kinds of systems. We can categorize them as Record and Engagement Systems.
The Record Systems are more stable and generally don't have frequent updates. Engagement Systems generally are created to support pieces of information that come from Record Systems. Then, an issue with this Engagement System could impact Record Systems.
First, we need to understand some initial concepts and a little history of developing and managing the environments.
In past, ware common we listen to the history of some projects that fail because of the integrations between the Developer and Operation teams.