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)

Building a simple PHP application

The first S2I lab will use a very simple PHP application that displays the PHP configuration using a standard PHP function—phpinfo(). It's composed of a single index.php file, with the following content:

$ cat index.php
<?php
phpinfo();
?>

This application is enough to demonstrate a basic S2I build. We have already prepared a Git repository on GitHub, which contains the code of our application. The repository is located at https://github.com/neoncyrex/phpinfo.git, and is going to be used in this lab.

First, we need to create a separate project for our new lab, as follows:

$ oc new-project phpinfo
Now using project "phpinfo" on server "https://localhost:8443".
<OMITTED>

The oc new-app command can build an application from its source code, using either a local or remote Git repository.

Let's clone the...