This is an excerpt from The Gorilla Guide to Kubernetes in the Enterprise, written by Joep Piscaer. You can download the full guide here.
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Software Delivery Has Evolved
The way we build and run applications has changed dramatically over the years. Traditionally, apps ran on top of physical machines. Those machines eventually became virtual. In both cases, the application and all its dependencies were installed on top of an OS.
This relationship between OS and applications created a tightly-coupled bundle of everything needed to run that application. Each virtual machine (VM) ran a complete OS, no matter how big or small the VM was, or how demanding the application on top.
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