February 2020
Intermediate to advanced
154 pages
3h 29m
English
Content preview from Kubernetes Operators
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Chapter 1. Operators Teach Kubernetes New Tricks
An Operator is a way to package, run, and maintain a Kubernetes application. A Kubernetes application is not only deployed on Kubernetes, it is designed to use and to operate in concert with Kubernetes facilities and tools.
An Operator builds on Kubernetes abstractions to automate the entire lifecycle of the software it manages. Because they extend Kubernetes, Operators provide application-specific automation in terms familiar to a large and growing community. For application programmers, Operators make it easier to deploy and run the foundation services on which their apps depend. For infrastructure engineers and vendors, Operators provide a consistent way to distribute software on Kubernetes clusters and reduce support burdens by identifying and correcting application problems before the pager beeps.
Before we begin to describe how Operators do these jobs, let’s define a few Kubernetes terms to provide context and a shared language to describe Operator concepts and components.
How Kubernetes Works
Kubernetes automates the lifecycle of a stateless application, such as a static web server. Without state, any instances of an application are interchangeable. This simple web server retrieves files and sends them on to a visitor’s browser. Because the server is not tracking state or storing input or data of any kind, when one server instance fails, Kubernetes can replace it with another. Kubernetes refers to these instances, each a ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.