Jenkins Continuous Integration server on Raspberry Pi

From a fresh install of Raspbian “wheezy” image running headless (with no desktop) : 

$ cat /etc/debian_version
wheezy/sid
$ uname -a
Linux raspberrypi2 3.2.27+ #250 PREEMPT Thu Oct 18 19:03:02 BST 2012 armv6l GNU/Linux

• Default Pi speed is slow for Jenkins so we need to overclock

$ sudo raspi-config

• Select 'Overclock -> Modest 800MHz ARM, 250MHz core, 400MHz SDRAM, 0 overvolt -> OK -> Reboot when selected'

 

• Post reboot check the frequency is 800 MHz :

$ vcgencmd get_config arm_freq
arm_freq=800

• Check default port of 8080 is free

$ netstat -an | grep -i 8080
<- nothing should show as bound

•  Install OpenJDK Java 6 runtime

$ sudo apt-get update
$ sudo apt-get install -y openjdk-6-jre

• Check Java version

$ java -version
 java version "1.6.0_27"
OpenJDK Runtime Environment (IcedTea6 1.12.4) (6b27-1.12.4-1+rpi1)
OpenJDK Zero VM (build 20.0-b12, mixed mode)

•  Install Jenkins

$ sudo apt-get install -y jenkins

• Post install check port 8080 is now bound for all IP's: 

$ netstat -an | grep -i 8080
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN  

• Open in GUI : http://< Raspberry Pi IP>:8080/

Note - Initial load of GUI make take a few minutes with high CPU but this is fine once it loads

• To monitor peformance htop is a good tool :

 $ sudo apt-get install -y htop