Book Image

OpenShift Multi-Cluster Management Handbook

By : Giovanni Fontana, Rafael Pecora
5 (1)
Book Image

OpenShift Multi-Cluster Management Handbook

5 (1)
By: Giovanni Fontana, Rafael Pecora

Overview of this book

For IT professionals working with Red Hat OpenShift Container Platform, the key to maximizing efficiency is understanding the powerful and resilient options to maintain the software development platform with minimal effort. OpenShift Multi-Cluster Management Handbook is a deep dive into the technology, containing knowledge essential for anyone who wants to work with OpenShift. This book starts by covering the architectural concepts and definitions necessary for deploying OpenShift clusters. It then takes you through designing Red Hat OpenShift for hybrid and multi-cloud infrastructure, showing you different approaches for multiple environments (from on-premises to cloud providers). As you advance, you’ll learn container security strategies to protect pipelines, data, and infrastructure on each layer. You’ll also discover tips for critical decision making once you understand the importance of designing a comprehensive project considering all aspects of an architecture that will allow the solution to scale as your application requires. By the end of this OpenShift book, you’ll know how to design a comprehensive Red Hat OpenShift cluster architecture, deploy it, and effectively manage your enterprise-grade clusters and other critical components using tools in OpenShift Plus.
Table of Contents (23 chapters)
Part 1 – Design Architectures for Red Hat OpenShift
Part 2 – Leverage Enterprise Products with Red Hat OpenShift
Part 3 – Multi-Cluster CI/CD on OpenShift Using GitOps
Part 4 – A Taste of Multi-Cluster Implementation and Security Compliance
Part 5 – Continuous Learning

Managing applications using Red Hat ACM

One of the greatest benefits of ACM is providing a single and simple way to view applications that are deployed among different clusters. You can also deploy an application into multiple clusters using two different approaches:

  • Using the embedded Application Subscription deployment model
  • Using OpenShift GitOps (Argo CD) and ApplicationSets

We will walk through the process of each approach in this section.

Application Subscription model

This model is embedded in ACM and doesn’t depend on anything other than ACM itself. In the Application Subscription model, you will define an Application object that subscribes (Subscription) to one or more Kubernetes resources (Channel) that contain the manifests that describe how the application is deployed. The application will be deployed in the clusters defined in the placement rules.

The following is a diagram that explains how this model works: