Chef install script - installs client

chef-install.sh

## Run this script (with sudo) to install Chef & Chef Server on a Debian based system.

#!/bin/sh

## script to install Ruby prerequisites on Ubuntu so that Chef can be used to manage configuration.
## authored by Forest Mars for Elephant Ventures
## please run this script as a user with sudo

# First we'll add opscode as a trusted repository (and update again)
echo "deb http://apt.opscode.com/ precise-0.10 main" | sudo tee /etc/apt/sources.list.d/opscode.list
mkdir -p /etc/apt/trusted.gpg.d
gpg --keyserver keys.gnupg.net --recv-keys 83EF826A
gpg --export packages@opscode.com | sudo tee /etc/apt/trusted.gpg.d/opscode-keyring.gpg > /dev/null
aptitude update
aptitude install opscode-keyring

# Update sources, baseline and install prerequisites
aptitude -y upgrade
aptitude install -y build-essential wget zlib1g-dev libssl-dev libffi-dev libncurses-dev libreadline-dev libyaml-dev libffi6 libssl0.9.8

# Precise Pangolin ships with Ruby 1.8.7 (not using rvm)
aptitude install ruby

# Gems are only included by default with Ruby >= 1.9
aptitude install rubygems

# And now we install Chef
aptitude install chef

mkdir -p ~/.chef
chown -R $USER ~/.chef

# If you're running this on a Rackspace cloud server, uncomment this line or you won't have knife. 
apt-get install --reinstall chef

## This is a chef client only, so we'll have to grab the pem keys off the chef-server
# cp /etc/chef/validation.pem /etc/chef/webui.pem ~/.chef

## Finally, once you have your chef-server keys on the client, you can run knife configure:
# knife configure -i 

## ca. http://wiki.opscode.com/display/ChefCN/Manual+Chef+Server+Configuration

On a Rackspace cloud server you have to reinstall Chef or knife will be missing-- I've confirmed/reproduced this a number of times for both their First-Generation cloud servers and both regions (Dallas & Chicago) of their Next-Generation cloud servers. This seems to result from the clean-up scripts that run after they provision the server with chef-solo.