How to mass delete all EC2 instances, useful to run on a cron if you're paranoid about leaving stuff on all the time...

.aws_stuff

# Get these from https://console.aws.amazon.com/iam/home?#security_credential
export AMAZON_ACCESS_KEY_ID=FOO
export AMAZON_SECRET_ACCESS_KEY=BAR
export EC2_REGION="eu-west-1"

destroy_all.rb

require 'fog'
 
#Either source .aws_stuff or add it to .bashrc etc
 
@credentials = {
  :provider => 'AWS',
  :aws_access_key_id => ENV['AMAZON_ACCESS_KEY_ID'],
  :aws_secret_access_key => ENV['AMAZON_SECRET_ACCESS_KEY'],
  :region => ENV['EC2_REGION'],
}
 
def connection
  @connection ||= Fog::Compute.new(@credentials)
end
 
connection.servers.all.each do |server|
  puts server.id
  puts "Destroying server now!"
  server.destroy
  puts "#{server.id} destroyed successfully"
end