This document discusses experiments running WSO2 middleware on Raspberry Pi clusters. The high-level plan was to: 1. Run Java and a vanilla Carbon kernel on a Raspberry Pi. 2. Run an enhanced Carbon kernel on a Pi and use it with the WSO2 Application Server. 3. Conduct load tests and use GPIO functionality to connect Pis into an application server cluster for monitoring and management. The experiments involved setting up a Raspberry Pi power supply, rack prototypes, and network to run the application server with optimizations like reducing boot time. Other experiments explored running Linux Containers on Pis. No Pis were harmed, but a few capacitors were exploded

1. Raspberry Pi – WSO2 Style

2. Raspberry Pie?

3. Raspberry Pie?

5. A humble beginning
IMG_20121220_124101.jpg

6. What the Pi??
WSO2 middleware
on Pi??

7. High level plan
• Run Java on Pi
• Run vanilla Carbon kernel on Pi
• Run enhanced Carbon kernel on Pi
• Use enhanced kernel with WSO2 AppServer
• Conduct load tests to get an idea about performance on
Pi
• Do something useful using GPIO functionality
• Bootup script which will connect any Pi into AS cluster

8. Supplying Power
to a
Raspberry Pi Cluster

21. Power Supply Schematic

22. V = IR
W = VI

26. Managing the work
area

27. Rack prototype #1

31. Rack prototype #2

40. The final outcome

41. Setting up
the
Network

42. Network setup

43. Cluster Management
&
Monitoring

44. Pis everywhere!

45. Too many instances to manage!

46. GPIO

47. The App
• wso2con.com/m
• Android
• iOS

48. API Dashboards
wso2con.com/m

49. Software
Optimizations

50. Carbon kernel & AppServer enhancements
• Run in worker mode without any admin services
• Disable unused deployers
• Lazy loading deployment artifacts
• Cut down bootup time from 5 minutes to 1.5 minutes
• Bleeding edge Hazelcast based clustering
implementation

51. Software
• OS
• Raspbian “wheezy”
• Linux kernel
• Linux raspberrypi 3.2.27+ #250 PREEMPT Thu Oct 18 19:03:02 BST 2012 armv6l GNU/Linux
• JAVA
• Java(TM) SE Embedded Runtime Environment (build 1.7.0_10-b18, headless)
• Python
• Python 2.7.3
• python-dev
• GPIO
• RPi.GPIO-0.4.1a
• WSO2
• AppServer with enhanced Carbon kernel

52. Other Experiments

53. LXC on Raspberry Pi

54. LXC on Raspberry Pi

57. LXC on Raspberry Pi

59. No Raspberry Pis
were harmed
in this production 

60. But we managed to
explode
few capacitors

61. Questions?

62. Thank you