Book Image

Kubernetes for Developers

By : Joseph Heck
Book Image

Kubernetes for Developers

By: Joseph Heck

Overview of this book

Kubernetes is documented and typically approached from the perspective of someone running software that has already been built. Kubernetes may also be used to enhance the development process, enabling more consistent testing and analysis of code to help developers verify not only its correctness, but also its efficiency. This book introduces key Kubernetes concepts, coupled with examples of how to deploy and use them with a bit of Node.js and Python example code, so that you can quickly replicate and use that knowledge. You will begin by setting up Kubernetes to help you develop and package your code. We walk you through the setup and installation process before working with Kubernetes in the development environment. We then delve into concepts such as automating your build process, autonomic computing, debugging, and integration testing. This book covers all the concepts required for a developer to work with Kubernetes. By the end of this book, you will be in a position to use Kubernetes in development ecosystems.
Table of Contents (16 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Using Prometheus to view application metrics


While you could add a job within Prometheus to include the configuration to scrape Prometheus metrics from a specific endpoint, the installation we did earlier includes a configuration that will update what it is looking at dynamically, based on annotations on pods. One of the benefits of Prometheus is that it has support for automatically detecting changes in your cluster, based on annotations, and it can look up the endpoints for the pods that back a service.

Since we deployed Prometheus using Helm, you can find the relevant configuration embedded within the values.yaml file. Look for the Prometheus job kubernetes-service-endpoints, and you will find both the configuration and some documentation of how it can be used. If you don't have the files locally, you can view this configuration at https://github.com/kubernetes/charts/blob/master/stable/prometheus/values.yaml#L747-L776.

This configuration looks for services within the cluster that have...