Book Image

Getting Started with Containerization

By : Dr. Gabriel N. Schenker, Hideto Saito, Hui-Chuan Chloe Lee, Ke-Jou Carol Hsu
Book Image

Getting Started with Containerization

By: Dr. Gabriel N. Schenker, Hideto Saito, Hui-Chuan Chloe Lee, Ke-Jou Carol Hsu

Overview of this book

Kubernetes is an open source orchestration platform for managing containers in a cluster environment. This Learning Path introduces you to the world of containerization, in addition to providing you with an overview of Docker fundamentals. As you progress, you will be able to understand how Kubernetes works with containers. Starting with creating Kubernetes clusters and running applications with proper authentication and authorization, you'll learn how to create high-availability Kubernetes clusters on Amazon Web Services (AWS), and also learn how to use kubeconfig to manage different clusters. Whether it is learning about Docker containers and Docker Compose, or building a continuous delivery pipeline for your application, this Learning Path will equip you with all the right tools and techniques to get started with containerization. By the end of this Learning Path, you will have gained hands-on experience of working with Docker containers and orchestrators, including SwarmKit and Kubernetes. This Learning Path includes content from the following Packt products: • Kubernetes Cookbook - Second Edition by Hideto Saito, Hui-Chuan Chloe Lee, and Ke-Jou Carol Hsu • Learn Docker - Fundamentals of Docker 18.x by Gabriel N. Schenker
Table of Contents (25 chapters)
Title Page
About Packt

Clustering etcd 

etcd stores network information and states in Kubernetes. Any data loss could be crucial. Clustering etcd is strongly recommended in a production environment. etcd comes with support for clustering; a cluster of N members can tolerate up to (N-1)/2 failures. Typically, there are three mechanisms for creating an etcd cluster. They are as follows:

  • Static
  • etcd discovery
  • DNS discovery

Static is a simple way to bootstrap an etcd cluster if we have all etcd members provisioned before starting. However, it's more common if we use an existing etcd cluster to bootstrap a new member. Then, the discovery method comes into play. The discovery service uses an existing cluster to bootstrap itself. It allows a new member in an etcd cluster to find other existing members. In this recipe, we will discuss how to bootstrap an etcd cluster via static and etcd discovery manually.

We learned how to use kubeadm and kubespray in Chapter 12, Building Your Own Kubernetes Cluster. At the time of writing...