The Cloud Computing Book by Comer Douglas;

Author:Comer, Douglas;
Language: eng
Format: epub
Publisher: CRC Press LLC
Published: 2021-06-17T00:00:00+00:00

10.5 Limits On Kubernetes Scope

Although it handles many functions, Kubernetes does omit some aspects of deploying and managing containerized software. Kubernetes

Does not focus on a specific application type

Does not manage source code or build containers

Does not supply event-passing middleware

Does not handle monitoring or event logging

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†See page 9 for an explanation of a load balancer.

Does not focus on a specific application type. Kubernetes is application agnostic in the sense that it can be used for an arbitrary type of application and an arbitrary programming paradigm. For example, it can be used to deploy stateful or stateless applications. It can be used with serverless or traditional client-server paradigms, and can support arbitrary workloads. Although it increases generality, remaining independent of the application type means that Kubernetes does not include special facilities for any specific type.

Does not manage source code or build containers. Kubernetes relies on conventional container technology to handle source code and build containers. Throughout the chapter, we will assume the use of Docker containers. Thus, when it deploys a container on a node, we will assume the node runs Linux along with the Docker software needed to run a container (i.e., dockerd).

Does not supply event-passing middleware. One programming paradigm used with containers passes asynchronous events among containers. Kubernetes does not supply the middleware needed to pass events, but instead assumes a programmer will use an extant middleware facility.

Does not handle monitoring or event logging. Kubernetes monitors and controls containers, but does not provide built-in mechanisms to collect, log, or report measurements. Some proof-of-concept systems are available for monitoring, but their use is optional.

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