Take OpenShift for a spin in four commands

Currently co-authoring a book on Docker: Get 39% off with the code 39miell

dip

OpenShift

Is RedHat’s application Platform as a Service (aPaaS). It builds on Docker and Kubernetes to provide an Enterprise-level service for application provisioning.

PaaSes bring a great of benefits with them: centralised resource management, quotas, isolation,

OpenShift is a relatively old product in aPaaS terms. What’s changed recently is that version 3 has been substantially changed to be built around Docker and Kubernetes and written in Go, which are seen as stable building blocks for the future.

In this article you’re going to get OpenShift set up in 5 commands, and see an application provisioned, built and deployed using just a login and a GitHub reference.

NOTE: It will be safer/easier to run if you already have Vagrant+Virtualbox installed. The script will try to install it for you if it’s not already though. This has primarily been tested on Ubuntu and Mac (on tin). If you have other operating systems, please get in touch if you come across problems.

Get Going

Run these four commands (assumes you have pip and git already):

sudo pip install shutit
git clone --recursive https://github.com/ianmiell/shutit-openshift-origin
cd shutit-openshift-origin
./run.sh

And you will get a desktop with OpenShift installed.

NOTE: You’ll need a decent amount of memory free (2G+), and may need to input your password for sudo. You’ll be prompted for both. You can choose to continue with less memory, but you may go into swap or just run out.

NOTE: Assumes you have pip. If not, try this:

sudo apt-get install python-pip || yum install python-pip || yum install python || sudo easy_install python || brew install python

Open up a browser within this desktop and navigate to:

https://localhost:8443

and bypass all the security warnings until you end up at the login screen.

Openshift_login

Now log in as hal-1 with any password.

Build a nodejs app

OK, you’re now logged into OpenShift as a developer.

Openshift_project

 

Create a project by clicking ‘Create’ (a project has been set up but this has quotas set up to demo limits). Fill out the form.

OpenShift_create_proj

and click ‘Create’ again.

Once the Project is set up, click on ‘Create’ again, in the top right hand side this time.

OpenShift_project_github

Choose a builder image (pick nodes:0.10). This build image defines the context in which the code will get built. See my source to image post for more on this.

OpenShift-builder_image

Now click on ‘Create’ on the nodejs page.

If you wait, then after a few minutes you should see a screen like the following:

OpenShift_start_build

and eventually, if you scroll down you will see that the build has started:

OpenShift_building

Eventually, you will see that the app is running:

OpenShift_running

and by clicking on ‘Browse’ and ‘Pods’ you can see that the pod has been deployed:

OpenShift_pods

Now, how to access it? If you look at the services tab:

OpenShift_service

you will see an ip address and port number to access. Go there, and voila, you have your nodejs app:

OpenShift_nodejs_app

Further Work

Now fork the github repo, make a change, and do a build against this fork.

If you can’t be bothered, use my fork at: https://github.com/docker-in-practice/nodejs-ex

 

Conclusion

There’s a lot more to OpenShift than this. If you want to read more see here:

https://docs.openshift.org/latest/welcome/index.html

Any problems with this, raise an issue here:

https://github.com/ianmiell/shutit-openshift-origin

or leave a message

 

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s