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)

Controlling resource consumption using ResourceQuotas

One of the main ideas behind OpenShift projects in multi-tenant environments is the need to limit resource consumption at a more granular level than just a whole cluster, providing operations with the ability to scope such limitations to organizations and departments.

OpenShift provides two mechanisms for setting limits on resource consumption in a cluster:

  • ResourceQuota
  • LimitRanges

This section is dedicated solely to ResourceQuotas. LimitRanges will be discussed in the next section.

ResourceQuota can be used to control the number of API resources that can be created, or the amount of CPU, memory, and storage consumed by pods in the same project the quotas were defined in. Essentially, they determine the capacity of a project. ResourceQuotas allows you to control the following types of resources:

  • Pods
  • ReplicationControllers...