OpenShift for Developers, 2nd Edition

Chapter 4. Deploying an Application on OpenShift

You’ve got a handle on OpenShift concepts and you have access to an OpenShift cluster. Now you’ll use OpenShift to create a project, build the project’s application from source, and run it.

A Simple Sample Application

We will honor tech tradition by beginning with a “Hello World” program. This chapter’s simple program runs an HTTP service that prints a response to each request. We’ve selected the Go programming language because it compiles quickly and to demonstrate more than one language environments. You’ll use the Java Quarkus framework to build a more complex application in later chapters. OpenShift techniques you’ll use throughout the book, like on-cluster builds and automatic deployment, are largely agnostic about the language and frameworks you choose for a project.

First, get a copy of the source code for the Hello World application. You’ll use Git to manage the source and GitHub to make your copy available for your cluster to build. Point your browser to this chapter’s GitHub repository. Fork a copy to your own GitHub account with the Fork button at the top right. In Git terms, a “fork” is an exact copy of a repository at a point in time. You can modify your fork to create your own version or to make, test, and submit changes back to the original repo. You’ll use Git in this chapter, but you don’t need deep Git expertise; the following extremely brief overview of Git words and ways should get you started.

Git and GitHub ...