Unlike virtual machines, containers don’t run their own OS. What if all 21 of those are Linux? It seems wasteful to run the same operating system so many times. That server is running a total of 21 operating systems at once: its own and one for each virtual machine. Let’s say you have a powerful server that is running 20 VMs. The drawback with virtual machines is that they each run their own OS. VMs are great for sharing a powerful server’s resources among apps that need to be isolated, for instance. Virtual machines are named this way because they emulate a physical machine on which you can run any operating system: Linux, BSD, Windows, or any other OS. While they do have some things in common, a container is NOT like a VM. What is a container exactly? I often hear people compare containers to virtual machines (VMs, for short). It allowed data to be persisted across application life-cycles. As a basic example of the power of Kubernetes, I installed a Ceph cluster using Rook. During that talk, I demoed how to install a Kubernetes cluster from scratch. This article is based on my talk from the Adaltas 2018 Summit. I will dive into what each step does so you can build a thorough understanding of what is going on. This article explains how to install a Kubernetes cluster.
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