[A.] Scripts related to Jenkins client setup

.bash_login.jenkins

# if running bash
if [ -n "$BASH_VERSION" ]; then
    # include .bashrc if it exists
    if [ -f "$HOME/.bashrc" ]; then
        . "$HOME/.bashrc"
    fi
fi

_base-setup.sh

#!/bin/bash
# As root ( via `sudo su -` ):

# Initialize ephemeral storage
curl https://raw.github.com/gist/3085368/ephemeral > /etc/init.d/ephemeral
chmod +x /etc/init.d/ephemeral
ln -s ../init.d/ephemeral /etc/rcS.d/S10ephemeral
/etc/init.d/ephemeral
ln -s /mnt/jenkins /var/jenkins
ln -s /mnt/mongodb /var/lib/mongodb
ln -s /mnt/tmp /tmp

# Set logrotate to keep only one unit (day or week) of each log
for f in /etc/logrotate.d/* /etc/logrotate.conf ; do
  sed -i 's/rotate [0-9]*$/rotate 1/' $f
done

apt-get update
apt-get install -y git build-essential bison openssl libreadline5 libreadline-dev curl git-core zlib1g zlib1g-dev libssl-dev libreadline-dev libxml2-dev autoconf libxslt-dev xvfb libgl1-mesa-dri xfonts-100dpi xfonts-75dpi xfonts-scalable xfonts-cyrillic libyaml-dev

# Jenkins spot request setup
apt-get install -y openjdk-7-jre wget python

# Set up Xvfb (virtual framebuffer)
curl https://raw.github.com/gist/3085368/xvfb > /etc/init.d/xvfb
chmod +x /etc/init.d/xvfb
update-rc.d xvfb defaults
service xvfb start

apt-get install -y openjdk-6-jdk ant
apt-get install -y imagemagick libmagick9-dev

# Firefox setup (install dependencies, then uninstall to downgrade)
apt-get install -y firefox
apt-get remove -y firefox firefox-globalmenu
wget http://releases.mozilla.org/pub/mozilla.org/firefox/releases/20.0.1/linux-x86_64/en-US/firefox-20.0.1.tar.bz2 -O /tmp/firefox.tar.bz2
cd /usr/local
tar xjf /tmp/firefox.tar.bz2
cd bin
ln -s ../firefox/firefox .
ln -s ../firefox/firefox-bin .

# Set up MongoDB
curl https://raw.github.com/gist/3085368/sources.list.10gen >> /etc/apt/sources.list
apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
apt-get update
apt-get install -y mongodb-10gen
update-rc.d mongodb defaults
service mongodb start

# Set up Jenkins spot instance callbacks
curl https://raw.github.com/gist/3085368/jenkins-spot-setup.py >> /usr/local/bin/jenkins-spot-setup.py
chmod +x /usr/local/bin/jenkins-spot-setup.py
sed -i 's/^exit 0$/sudo -i -u jenkins python \/usr\/local\/bin\/jenkins-spot-setup.py\n&/' /etc/rc.local

# Set up Redis
apt-get install -y redis-server

# User-level setup
useradd -k /etc/skel -m -s /bin/bash jenkins
mkdir /home/jenkins/.ssh
cp /home/ubuntu/.ssh/authorized_keys /home/jenkins/.ssh/authorized_keys
chown -R jenkins:jenkins /home/jenkins/.ssh
chmod 700 /home/jenkins/.ssh
chmod 600 /home/jenkins/.ssh/authorized_keys

curl https://raw.github.com/gist/3085368/sudoers.wheel >> /etc/sudoers
groupadd wheel
usermod -G wheel jenkins

mkdir -p /var/jenkins/workspace
chown -R jenkins:jenkins /var/jenkins

_jenkins-user-setup.sh

#!/bin/bash
# As user jenkins ( via `sudo su - jenkins` ):

sudo su -l jenkins
ssh-keygen -q -t rsa -N "" -f .ssh/id_rsa

curl -L https://get.rvm.io | bash -s stable
rvm install 1.9.2
rvm install 1.9.3
rvm install 2.0.0
rvm install jruby --1.9

git clone git://github.com/creationix/nvm.git ~/.nvm
curl https://raw.github.com/gist/3085368/bash_login.jenkins > /home/jenkins/.bash_login
mv /home/jenkins/.bashrc /home/jenkins/.bashrc~
curl https://raw.github.com/gist/3085368/bashrc.jenkins > /home/jenkins/.bashrc
cat /home/jenkins/.bashrc~ >> /home/jenkins/.bashrc
rm /home/jenkins/.bashrc~
nvm install v0.8.17

curl https://raw.github.com/gist/3085368/ssh_config >> /home/jenkins/.ssh/config

bashrc.jenkins

[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # Load RVM into a shell session *as a function*

. ~/.nvm/nvm.sh

if [ -z "$PS1" ]; then
  PATH=$PATH:$HOME/.rvm/bin # Add RVM to PATH for scripting
  PATH=node_modules/.bin:$PATH
fi

ephemeral

#!/bin/sh
# Initialize ephemeral storage on /mnt

mkdir -p /mnt/jenkins/workspace
chown -R jenkins:jenkins /mnt/jenkins

mkdir -p /mnt/mongodb
chown mongodb:mongodb /mnt/mongodb

mkdir -p /mnt/tmp
chmod 1777 /mnt/tmp

jenkins-spot-setup.py

#!/usr/bin/python
import os
import httplib
import string
import base64

conn = httplib.HTTPConnection("169.254.169.254")
conn.request("GET", "/latest/user-data")
response = conn.getresponse()
userdata = response.read()

args = string.split(userdata, "&")
jenkinsUrl = ""
jenkinsAuth = ""
slaveName = ""

for arg in args:
  if arg.split("=")[0] == "JENKINS_URL":
    jenkinsUrl = arg.split("=")[1]
  if arg.split("=", 1)[0] == "USER_DATA":
    subarg = base64.b64decode(arg.split("=", 1)[1])
    if subarg.split("=")[0] == "JENKINS_AUTH":
      jenkinsAuth = subarg.split("=")[1]
  if arg.split("=")[0] == "SLAVE_NAME":
    slaveName = arg.split("=")[1]

os.system("wget " + jenkinsUrl + "jnlpJars/slave.jar -O slave.jar")
os.system("java -jar slave.jar -jnlpCredentials " + jenkinsAuth + " -jnlpUrl " + jenkinsUrl + "computer/" + slaveName + "/slave-agent.jnlp")

sources.list.10gen

# 10gen MongoDB repository
deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen

ssh_config

Host github.com
  StrictHostKeyChecking no

Host heroku.com
  StrictHostKeyChecking no

Host *
  ServerAliveInterval 15

sudoers.wheel

%wheel	ALL=(ALL) NOPASSWD: ALL

xvfb

#!/bin/sh

XVFB=/usr/bin/Xvfb
XVFBARGS=":99 -screen 0 1024x768x24 -fbdir /var/run -ac"
PIDFILE=/var/run/xvfb.pid
case "$1" in
  start)
    echo -n "Starting virtual X frame buffer: Xvfb"
    start-stop-daemon --start --quiet --pidfile $PIDFILE --make-pidfile --background --exec $XVFB -- $XVFBARGS
    echo "."
    ;;
  stop)
    echo -n "Stopping virtual X frame buffer: Xvfb"
    start-stop-daemon --stop --quiet --pidfile $PIDFILE
    echo "."
    ;;
  restart)
    $0 stop
    $0 start
    ;;
  *)
  echo "Usage: /etc/init.d/xvfb {start|stop|restart}"
  exit 1
esac
exit 0

This script is intended primarily for informational purposes, and as a base for similar custom configuration scripts. Setup instructions for nihilists and other reckless individuals:

1. Launch Ubuntu 11.10 AMI 4dad7424.
2. Log in to the instance, and run the following commands:

curl -L https://raw.github.com/gist/3085368/_base-setup.sh | sudo bash -s
sudo su -l jenkins
curl -L https://raw.github.com/gist/3085368/_jenkins-user-setup.sh | bash -s

Cross ref; This post 2012-07 describes Artsy's use of these setup scripts; http://artsy.github.io/blog/2012/07/10/on-demand-jenkins-slaves-with-amazon-ec2/