Puppet 3.1.1 using Ruby 1.9.3 on Amazon Linux

UPDATE: Amazon Linux is now on Ruby 2.x, so below is DEPRECATED for new Amazon Linux images. But parts may be useful.

1. yum -y remove ruby
2. yum -y install ruby19
3. gem install --no-rdoc --no-ri puppet --version=3.1.1 
4.  /usr/local/bin/puppet -V
1. add /usr/local/bin to $PATH of users that need it
5.  vi /usr/local/share/gems1.9/gems/facter-1.7.5/lib/facter/ec2.rb
1. change line 28 to:
1. if (Facter::Util::EC2.can_connect?)
2. Reference: http://projects.puppetlabs.com/issues/7559
3. existing line 28 is much longer

 If you manage user passwords with Puppet

1. yum -y install ruby19-devel
2. yum -y groupinstall "Developer Tools"
3. gem install --no-rdoc --no-ri ruby-shadow