Book Image

Kubernetes - A Complete DevOps Cookbook

By : Murat Karslioglu
Book Image

Kubernetes - A Complete DevOps Cookbook

By: Murat Karslioglu

Overview of this book

Kubernetes is a popular open source orchestration platform for managing containers in a cluster environment. With this Kubernetes cookbook, you’ll learn how to implement Kubernetes using a recipe-based approach. The book will prepare you to create highly available Kubernetes clusters on multiple clouds such as Amazon Web Services (AWS), Google Cloud Platform (GCP), Azure, Alibaba, and on-premises data centers. Starting with recipes for installing and configuring Kubernetes instances, you’ll discover how to work with Kubernetes clients, services, and key metadata. You’ll then learn how to build continuous integration/continuous delivery (CI/CD) pipelines for your applications, and understand various methods to manage containers. As you advance, you’ll delve into Kubernetes' integration with Docker and Jenkins, and even perform a batch process and configure data volumes. You’ll get to grips with methods for scaling, security, monitoring, logging, and troubleshooting. Additionally, this book will take you through the latest updates in Kubernetes, including volume snapshots, creating high availability clusters with kops, running workload operators, new inclusions around kubectl and more. By the end of this book, you’ll have developed the skills required to implement Kubernetes in production and manage containers proficiently.
Table of Contents (12 chapters)

Assigning applications to nodes

In this section, we will make sure that pods are not scheduled onto inappropriate nodes. You will learn how to schedule pods into Kubernetes nodes using node selectors, taints, toleration and by setting priorities.

Getting ready

Make sure you have a Kubernetes cluster ready and kubectl and helm configured to manage the cluster resources.

How to do it…

This section is further divided into the following subsections to make this process easier:

  • Labeling nodes
  • Assigning pods to nodes using nodeSelector
  • Assigning pods to nodes using node and inter-pod affinity

Labeling nodes

Kubernetes labels are used for specifying the important attributes of resources that can be used to apply organizational structures onto system objects. In this recipe, we will learn about the common labels that are used for Kubernetes nodes and apply a custom label to be used when scheduling pods into nodes.

Let's perform the following steps to list some of the default labels...