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)

Managing users in OpenShift

When we use the oc command, it makes an API call to the OpenShift cluster using user credentials.

There are three main user types in OpenShift. Let's quickly talk about each of these three types:

  • Regular users: A regular OpenShift user. Regular users are usually developers with access to OpenShift projects. Regular OpenShift user examples include user1 and user2.
  • System users: System OpenShift users are special and most of these users are created when OpenShift is being installed. System user examples are:
    • system:admin: OpenShift cluster administrator user
    • system:node:node1.example.com: node1.example.com node user
    • system:openshift-registry: OpenShift registry user
  • Service accounts: Special system users associated with projects. Some of these users are created when a new OpenShift project is being created.
We are going to work with system...