find_security_group.rb

#!/usr/bin/env ruby
##########################################
#
# This script is to help you get around the dreaded 'Resource Has A Dependent Object'
# when deleting something in AWS. It will search a handful of places for that sg ID
# and let you know if it finds anything. Its a pretty quick n dirty script. 
#
# If I missed any areas it should search, please let me know or better yet, make a pull request!
#
# You'll need to install the aws-sdk ruby gem: sudo gem install aws-sdk
# Then edit below the 3 items.
#
##########################################


########## Configure Here ##########

@mySg = "sg-11111111"  ## security group ID to look for

aws_key = "xxxNOTREALLYMYKEYXXX"  ## your aws key
aws_sec = "xxxPUTYOURAWSSECRETINHERENOWDOITNOW!xxxx"  ## your aws secret key

########## Done configuring ##########


########## Start Script ##########

require 'rubygems'

begin
  require 'aws-sdk'
rescue LoadError
  puts "You dont have aws-sdk installed. Make sure to install it: sudo gem install aws-sdk"
end

begin
  require 'pp' ## only used for debugging
rescue LoadError
end


## create ec2 client
AWS.config(
    :access_key_id => aws_key,
    :secret_access_key => aws_sec
  )

@ec2 = AWS::EC2.new
@elb = AWS::ELB.new


puts "Searching security groups"
@ec2.security_groups.each do |sgs|
  sgs.egress_ip_permissions.each do |perm|
    # pp perm.groups.find{|sg| sg.id == @mySg}
    perm.groups.each do |sg|
      puts "Other Security Group: #{sgs.id}" if sg.id == @mySg
    end
  end
  sgs.ingress_ip_permissions.each do |perm|
    # pp perm.groups.find{|sg| sg.id == @mySg}
    perm.groups.each do |sg|
      puts "Other Security Group: #{sgs.id}" if sg.id == @mySg
    end
  end
end
exit


puts "Searching instances"
@ec2.instances.each do |instance|  
  instance.security_groups.each do |sg|
    puts "Instance: #{instance.id}" if sg.id == @mySg
  end
end

puts "Searching network interfaces"
@ec2.network_interfaces.each do |nic|
  nic.security_groups.each do |sg|
    puts "Network Interface: #{nic.id}" if sg.id == @mySg
  end
end

puts "Searching ELBs"
@elb.load_balancers.each do |lb|
  lb.security_groups.each do |sg|
    puts "ELB: #{lb.id}" if sg.id == @mySg
  end
end