Why clustering ?

In Chapter 1, DevOps in the Real World, you learned about organizational alignment and why is important to shift roles in a company to accommodate DevOps tools. It is not okay anymore to just be a developer or a sysadmin; now you need to be a full stack DevOps engineer in order to get success in any project. Full stack DevOps means that you need to understand the business and the technology used in the organisation. Think about it; if you became a civil engineer instead of an IT engineer, it is mandatory to know the local rules (the business) plus the commercial names of the tools used to build roads and bridges (the technology) but also be able to coordinate their building (ops). Maybe not every engineer needs to know everything but they need to be aware of in the full picture in order to ensure the success of the project.

Coming back to containers and DevOps, making concepts simple for everyone to understand is something that's mandatory nowadays. You want to ensure that...