The final section in this chapter is one of the most important best practices I can suggest. The final section covers the importance of understanding your environment.
Some believe that a systems administrator's job stops at the applications installed on the system and that the systems administrator should only be concerned with the operating system and the operating system's components, such as networking or file systems.
I do not follow this philosophy. In reality, it is often that a systems administrator will start to understand how an application works in production better than the development team who created it.
From my experience, in order to truly support a server, you must understand the service and applications ...