CHAPTER 30Deploying 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 set of software that can be transported and run efficiently. But the story doesn't end there. Once you have some containers, the next step is to engage them with 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 everything.
  • Set the state of your application and not just run it. What this means is that, instead of just saying to run a container, you want to be able to say something like “run three copies of container X, and if one goes down, be sure to start another one to replace it.”
  • Recover from host computers going down or becoming overloaded. If the host running a container fails, you want the container to recover quickly and start up on another host computer.
  • Not be concerned about the infrastructure. You want your application to connect to the services that it needs without having to know ...

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