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
Copyright
About Packt
Contributors
Preface
Index

Swarm nodes


A swarm is a collection of nodes. We can classify a node as a physical computer or virtual machine (VM). Physical computers these days are often referred to as bare metal. People say we're running on bare metal to distinguish from running on a VM.

When we install Docker on such a node, we call this node a Docker host. The following figure illustrates a bit better what a node and what a Docker host is:

Bare metal and VM type Docker Swarm nodes

To become a member of a Docker Swarm, a node must also be a Docker host. A node in a Docker Swarm can have one of two roles. It can be a manager or it can be a worker. Manager nodes do what their name implies; they manage the swarm. The worker nodes in turn execute application workload.

Technically, a manager node can also be a worker node and thus run application workload, although that is not recommended, especially if the swarm is a production system running mission critical applications.

Swarm managers

Each Docker Swarm needs to have at least...