February 2021
Intermediate to advanced
188 pages
4h 23m
English
Content preview from Certified Kubernetes Application Developer (CKAD) Study Guide
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Chapter 4. Multi-Container Pods
The previous chapters explained how to manage single-container Pods. That’s the norm, as you’ll want to run a microservice inside of a single Pod to reinforce separation of concerns and increased cohesion. Technically, a Pod allows you to configure and run multiple containers. The section “Multi-Container Pods” of the CKAD curriculum addresses this concern.
In this chapter, we’ll discuss the need for multi-container Pods, their relevant use cases, and the design patterns that emerged in the Kubernetes community. The exam outline specifically mentions three design patterns: the sidecar, the adapter, and the ambassador. We’ll make sure to get a good grasp of their application with the help of representative examples.
We’ll also talk about init containers. Init containers help with transitioning the runtime environment into an expected state so that the application can work properly. While it’s not explicitly mentioned in the CKAD curriculum, I think it’s important to cover the concept, as it falls under the topic of multi-container Pods.
At a high level, this chapter covers the following concepts:
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Pod
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Container
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Volume
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Design patterns
Note
This chapter will use the concept of a Volume. Reference Chapter 8 for more information if you’re not familiar with Kubernetes’ persistent storage options.
Defining Multiple Containers in a Pod
Especially to beginners of Kubernetes, how to appropriately design a Pod isn’t necessarily apparent. Upon reading ...
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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.