Instantly Run An App in the Cloud
|Title||Instantly Run An App in the Cloud Using OpenShift|
|Overview||Students need to know what Cloud Computing really means, how it fits into the wider computing context, and how they can use an open source cloud alternative to quickly host coding platforms for them to toy around in. This activity sets out to do all of this as a walkthrough learn-as-you-go tutorial.|
|Prerequisite Knowledge||Command line skills and Beginner Git experience (git activity 1)|
What is the rational for this activity?
Students need to know what Cloud Computing really means, how it fits into the wider computing context, and what the different types are (IaaS, PaaS, SaaS). Students can dig into PasS, as a powerful development platform - and understand how quickly, easily, and powerfully they can spin up new applications. Gone are the days of having to setup a physical server, know the details on how to setup the OS, fiddle with the kernel, setup web-servers (Apache), databases (Postgres, Mysql), and middle-ware micros-services (AMQP Message busses, JBoss Fuse, Apache Camel). In a PaaS environment like OpenShift, the developer just fires up an instance of whatever pieces they want, and start coding. Seriously - its that easy. Of course, the developer has to know how to develop in said language or platform, but it makes development considerably easier by removing focus from lower layers. Basically, those lower layers (most mentioned above) are automated away by the PaaS platform.
We need an activity that can show students, step-by-visual-step, how to start up a new coding environment and actually code a small chunk of working software on Openshift. Make it something sexy, like Node.js. Make it an effective piece of code (contact someone within red hat for advise) and it would be even more amazing.
- What is Cloud Computing? http://csrc.nist.gov/publications/nistpubs/800-145/SP800-145.pdf
- Read about Cloud Computing paradigm and deployment patterns. http://www.pcmag.com/article2/0,2817,2372163,00.asp
- Read about open sources role in cloud computing. http://opensource.com/business/13/1/future-cloud-computing
- Read about PaaS. http://www.thoughtsoncloud.com/2014/02/what-is-platform-as-a-service-paas/
- Read about Node.js http://blog.langoor.mobi/node-js-mobile-web-apps/
You may have heard of Software as a Service (SaaS), or Cloud Computing before. Examples of SaaS are that of Google Docs, Twitter, DropBox. Another flavor of Cloud Computing is Platform as a Service (PaaS). This cloud-hosted service allows developers to program apps and functionality in an easy to grasp and scale and demo online environment. You can push stuff live very quickly, and you dont have to worry about backup or the Operating System, or getting database services running. Your infrastructure and coding platform are pre-taken-care-of. You just code your app. Lets go signup for one and start a simple blog app.
Here are the major steps you will implement:
- Get OpenShift Online account
- Quick Setup
- Quick Win - Start Wordpress
- Implement phpmyadmin
- Setup OpenShift
Get OpenShift Online account
One such PaaS provider (amongst many) is Red Hats OpenShift. Other examples are Heroku, Google AppEngine, Engineyard, Microsoft Azure, VMWare's CloudFoundry. The list goes on. However, one of the cool things bout OpenShift is that its open sourced. You will remain free to move your code and environment to other vendors within OpenShift. Say that Red Hat starts charging too much - many vendors can be implementing the same environment,allowing you to easily move (at least, more easily than proprietary solutions). Alternatively, you could take OpenShifts code and implement your own PaaS server, on your computer at home. Only those whose source code is open sourced can claim this.
- Head to https://www.openshift.com/ and look for "Openshift Online".
- Signup for a free account
- Verify it by email
- Login to OpenShift Online
- Click on the Settings tab on the webpage
- Namespace field, fill it in
- This will define the URL that you and others will visit to see your live apps that your create.
- So, for example, we enter "teachingoss" and our URLs will be something like:
- Public Keys, for now, we will leave this blank
- If you know what a public key is, and you have one on your existing machine, go ahead and enter it here
- This will allow you to extremely easily access the SSH command line of your virtual app
- We will touch on it in a later activity
Quick Win - Start Wordpress
- Click on the Applications tab
- If you have not started an app already, click the text Create your first application now
- A list of applications, coding platforms, coding languages, and middleware appear in a large grid / list.
- This is how you can explore what Red Hat offers "out of the box".
- Dont worry though, this is open source, and the community provides hundreds more at http://hub.openshift.com
- We wont use hub.openshift in this example
- Choose Wordpress as the app that we will launch.
- Troubleshoot: If you dont see Wordpress, there is a search field where you can type it in and find it
What will the student hand in?
How will the activity be graded?
How will learning will be measured?
Include sample assessment questions/rubrics.
|Criteria||Level 1 (fail)||Level 2 (pass)||Level 3 (good)||Level 4 (exceptional)|
|The purpose of the project|
|Why the project is open source|
What should the instructor know before using this activity?
What are some likely difficulties that an instructor may encounter using this activity?
|Knowledge Area/Knowledge Unit||What ACM Computing Curricula 2013 knowledge area and units does this activity cover? ACM_Body_of_Knowledge|
|Topic||What specific topics are addressed? The Computing Curriucula 2013 provides a list of topics - https://www.acm.org/education/CS2013-final-report.pdf|
|Level of Difficulty||Is this activity easy, medium or challenging?|
|Estimated Time to Completion||How long should it take for the student to complete the activity?|
|Materials/Environment||What does the student need? Internet access, IRC client, Git Hub account, LINUX machine, etc.?|
|Author||Who wrote this activity?|
|Source||Is there another activity on which this activity is based? If so, please provide a link to the original resource.|
|License||Under which license is this material made available? (http://creativecommons.org/licenses/)|
Suggestions to Open Source Mentors:
Suggestions for an open source community member who is working in conjunction with the instructor.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License