December 2025
Intermediate to advanced
704 pages
19h 14m
English
Content preview from Ubuntu Linux Bible, 11th Edition
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CHAPTER 29Deploying Applications as Containers with Kubernetes
Linux containers separate the applications they contain from the operating systems on which they run. Built properly, a container will hold a discrete software stack that can be efficiently shared, shifted, and run anywhere. But the story doesn’t end there. Once you have some containers—and we’re talking about the Docker variety of container here—the next step is to manage them through a platform like Kubernetes that allows you to do the following:
- Group sets of containers together to form a larger application. For example, deploy a web server, a database, and monitoring tools together.
- Scale up your containers as the demand requires. In fact, you want to be able to scale each component of the larger application individually, without having to scale up those individual applications whose demand doesn’t require it.
- Set the state of your application and not just run it. What this means is that, instead of just deciding to run a container, you want to be able to decide to, say, “run three copies of container X, and if one goes down, be sure to start another one to replace it.”
- Recover from failures or overload of host computers. If the host running a container crashes, you want the container to recover quickly and start up on another host computer.
- Remain infrastructure-agnostic. You ...
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