Book Image

Learn OpenShift

By : Denis Zuev, Artemii Kropachev, Aleksey Usov
Book Image

Learn OpenShift

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)

OpenShift architecture

The OpenShift Container platform is both simple and complex when it comes to OpenShift components and overall architecture. It is complex in that it involves a lot of components interconnected with each other, but OpenShift is simple in the sense that all its components work independently of each other, and work seamlessly if something fails:

OpenShift components

OpenShift and Kubernetes have most architecture components in common, such as:

  • OpenShift masters
  • OpenShift nodes
  • Etcd as a key-value store

Components that are unique to OpenShift are:

  • Router as ingress traffic control
  • OpenShift Internal Registry

The following diagram describes the OpenShift container platform from an architectural point of view:

OpenShift architecture

OpenShift is built on top of Docker and Kubernetes, sometimes referred to as Kubernetes++. In addition to the Docker and Kubernetes...