OpenShift v3 is a PaaS management software relying on innovative technologies allowing you to run your own cloud environment in your private infrastructure, on public clouds or in hybrid way.
To get familiar with OpenShift, the best thing to do, is try to install it on your (muscled (8GB+ RAM)) laptop and deploy some of the example environment and run hello world applications on it.
To do so, I recommend you to use the All-In-One image provided by the OpenShift team at this address: http://www.openshift.org/vm/
You will have to be familiar with Vagrant and and a virtualisation tool like VirtualBox (or bitterly, a Linux Kernel based virtualisation tool like KVM) and your OpenShift 1-machine cluster will be running in minutes.
Step by step
Easy and simple, just perform the following steps. Let’s assume that we are using OSX, but the steps are very similar if using Windows or Linux of course. For convenience also, we will be using VirtualBox which is available on the 3 platforms.
Installing the tools
The required tools are: VirtualBox and Vagrant.
VirtualBox is a available on the virtual box website. Download a 5.0.x version for your platform and take a few minutes also to download the extension pack for your platform. The installation is quite straight forward by using a wizard installer: Next Next Next install.
Vagrant is a command line “script like” based tool used to control VirtualBox using command lines. The script recipe is named a Vagrantfile which will contain the whole logic for creating a Virtual Machine and settings its various configuration elements. Vagrant is also installable with OS specific packages and/or wizard based installer available from the vagrant download page.
Downloading the OpenShift All-In-One files
Visit the OpenShift All-In-One page at http://www.openshift.org/vm/ and you will see there all the materials that we are now ready to use to start our OpenShift cluster. You now all know what are the different tools referring too. So let’s continue by downloading the following elements:
- The Vagrant Box File 1.0.6, about 2.1GB : This file is a template Virtual Box image containing the base OpenShift VM
- The Vagrantfile : The vagrant recipe to start and run the OpenShift cluster
Once you have these files, I recommend you to put them in the same directory for example under your home directory:
mkdir -p ~/OpenShift
mv ~/Downloads/Vagrantfile ~/OpenShift
mv ~/Downloads/openshift-bootstrap-1.0.6.box ~/OpenShift
Adding the box image
To enable Vagrant to instantiate virtual machines using the provided .box image, we will have to add it to the Vagrant available boxes.
vagrant box add openshift-bootstrap-1.0.6.box
Starting the VM
Before starting the VM, we will just perform a single change on the Vagrantfile, in case you have a slow laptop like mine, to avoid a timeout while starting the VM and add the following line just after config.vm.box = “openshift3”
config.vm.boot_timeout = 600
To start your VM, then simply run the following command:
Wait for a few minutes, and if you want to see progress, you can launch your VirtualBox console and see that a VM named “openshift3” is automatically started and configured.
Connecting to your OpenShift dashboard
Vagrant establishes a port-forward between some ports of the running VM and ports on your localhost. We may have notice this on the log messages.
The openshift master will listen on its localhost interface on port 8443 which will be mapped to your laptop localhost on port 8443 which will be convenient for OpenShift self SSL certificates to be accepted.
To connect to the dashboard, simply visit this address: https://localhost:8443/ . You will be able to see the login screen.
Login using the following credentials:
- Username: admin
- Password: admin
And you will then see the list of existing environment and applications:
Deploying your first environment
To start a new project, simply clic on the New Project button on the upper right corner of the screen and select your environment:
Running the first hello-word app
Then, you can add your first application to this project by clicking the Add to project button, and select the template. Here the EAP6 template.