April 2019
Intermediate to advanced
266 pages
6h 6m
English
Content preview from Kubernetes Patterns
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Chapter 15. Sidecar
A Sidecar container extends and enhances the functionality of a preexisting container without changing it. This pattern is one of the fundamental container patterns that allows single-purpose containers to cooperate closely together. In this chapter, we learn all about the basic Sidecar concept. The specialized follow-up patterns, Adapter and Ambassador, are discussed in Chapter 16 and Chapter 17, respectively.
Problem
Containers are a popular packaging technology that allows developers and system administrators to build, ship, and run applications in a unified way. A container represents a natural boundary for a unit of functionality with a distinct runtime, release cycle, API, and team owning it. A proper container behaves like a single Linux process—solves one problem and does it well—and is created with the idea of replaceability and reuse. This last part is essential as it allows us to build applications more quickly by leveraging existing specialized containers.
Today, to make an HTTP call, we don’t have to write a client library, but use an existing one. In the same way, to serve a website, we don’t have to create a container for a web server, but use an existing one. This approach allows developers to avoid reinventing the wheel and create an ecosystem with a smaller number of better-quality containers to maintain. However, having single-purpose reusable containers requires ways of extending the functionality of a container and a means for collaboration ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.