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)

Kubernetes limitations

Although it is a powerful orchestration engine, Kubernetes doesn't have the features that are commonly required by PaaS solutions such as OpenShift and others:

  • Security:

Kubernetes namespaces are provided mainly for the purpose of resource quota enforcement for different groups of users, but they do not provide any security constraints or authentication. For example, every user from every namespace can see all other namespaces and their resources.

  • Deployments:

Kubernetes provides the means to create a deployment from an image with a single command, but doesn't create a service for external clients.

  • SCM integration:

Kubernetes doesn't support integration with SCM via webhooks to facilitate deployment.

  • Builds:

Kubernetes doesn't provide advanced build modes such as Source-to-Image (S2I) and Custom Builder.

  • Authentication:

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