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


While in the deployment phase, whatever kind of installation you do, it is common for things to not work as expected. We will look at some error cases you could face during deployment.

Why did the openshift-install execution stick waiting for the API?

The following message will be displayed:

Message: "INFO Waiting up to 20m0s for the Kubernetes API at"

Sometimes, the INFO message can be big trouble. At this point, you do not have much output to investigate, even if you increase the debug level of the messages. In this case, you should look at some of these options:

  • Look up the API URL and check the DNS resolution; the query must result in the API IP in install-config.yaml.
  • Try to ping all three master nodes individually to assure it is already up.
  • UPI installation: Check on the hypervisor VM terminal if all masters are up and running and at the login prompt screen. Master nodes on the bootloader menu...