A script that will deploy changes to multiple servers. This is just a brief example of what can be done if you need to make quick changes on multiple servers when time is hitting close to the deadline.

remote.rb

#!/usr/bin/ruby
require 'rubygems'
require 'net/ssh'

class Remote
  attr_accessor :hostfile, :user, :pass, :commands 

  def initialize(hostfile,user, pass, commands)
    @hostfile = hostfile
    @user = user
    @pass = pass
    @commands = commands
  end

########################
# Main part of script
########################
  def execute
    File.open(@hostfile).each {
        |i|
      puts("*"*20)
      puts("Logging on to #{i}")
      puts("*"*20)
      Net::SSH.start( i.chomp, @user, :password => @pass ) do|ssh|
        result = ssh.exec!(@commands)
        puts result
      end
      puts ("-"*20)
    }

  end


end

hostfile = open('hosts')
user = 'root'
pass = 'password'
commands = <<-eos
echo "##############################"
echo "HOSTNAME"
echo "##############################"
hostname
[ $? == "0" ] && echo "Status Okay" || echo "Command did not execute.."
echo "##############################"
echo "UPTIME"
[ $? == "0" ] && echo "Status Okay" || echo "Command did not execute.."
echo "##############################"
echo 'BIOS'
echo "##############################"
dmidecode -t bios
[ $? == "0" ] && echo "Status Okay" || echo "Command did not execute.."
set apple fruit steak
echo $1 $2 $3
[ "${1}" == "apple" ] && {
echo "#############################"
echo "Mounted File Systems"
echo "#############################"
}
eos

change = Remote.new(hostfile,user, pass, commands)
change.execute