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Learn OpenShift

Learn OpenShift

By : Denis Zuev, Artemii Kropachev, Aleksey Usov
3 (2)
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Learn OpenShift

Learn OpenShift

3 (2)
By: Denis Zuev, Artemii Kropachev, Aleksey Usov

Overview of this book

Docker containers transform application delivery technologies to make them faster and more reproducible, and to reduce the amount of time wasted on configuration. Managing Docker containers in the multi-node or multi-datacenter environment is a big challenge, which is why container management platforms are required. OpenShift is a new generation of container management platforms built on top of both Docker and Kubernetes. It brings additional functionality to the table, something that is lacking in Kubernetes. This new functionality significantly helps software development teams to bring software development processes to a whole new level. In this book, we’ll start by explaining the container architecture, Docker, and CRI-O overviews. Then, we'll look at container orchestration and Kubernetes. We’ll cover OpenShift installation, and its basic and advanced components. Moving on, we’ll deep dive into concepts such as deploying application OpenShift. You’ll learn how to set up an end-to-end delivery pipeline while working with applications in OpenShift as a developer or DevOps. Finally, you’ll discover how to properly design OpenShift in production environments. This book gives you hands-on experience of designing, building, and operating OpenShift Origin 3.9, as well as building new applications or migrating existing applications to OpenShift.
Table of Contents (24 chapters)
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Considerations regarding the iptables-alerter

Starting from 4.16, OpenShift includes a DaemonSet called iptables-alerter that tries to detect if customers are using iptables in any of their pods. If yes, it logs Events warning them that iptables is going away in RHEL 10 in 2025. Like CoreDNS pods, iptables-alerter pods also fail to start on nodes with custom taints, however adding tolerations to this DaemonSet is not supported. This does not affect operations, only logging. Read more at [6].You can check if you are affected with oc get po -o wide -n openshift-network-operator:

Figure 4.12: iptables-alerter pods are not running on infra nodes

As you can see, there are no such pods running on our infra nodes. This is a known issue that is being tracked in [7]. At the time of writing this chapter, there is no supported fix for this. An unsupported solution would be to change the Network CR to Unmanaged, so that it doesn't reset DaemonSet configuration, and add a toleration directly...

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