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      if($build_config_instance){
        my $host = 'root@' . $instance->dns_name();
...
        `ssh -i $pvt_key $host /root/$build_script `;
      }

Oct  4 02:15:51 svrname S70ec2-get-credentials: New ssh key added to /
+root/.ssh/authorized_keys from http://169.254.169.254/1.0/meta-data/p
+ub
lic-keys/0/openssh-key
Oct  4 02:15:52 svrname S71ec2-run-user-data: Retrieving user-data
Oct  4 02:15:52 svrname S71ec2-run-user-data: Skipping user-data as it
+ does not begin with #!

#!/usr/bin/perl
use strict;
...

  print STDERR Dumper($instance);
}

#!/bin/bash
set -e -x
...
apt-get --yes update
apt-get --yes upgrade
apt-get --yes install subversion build-essential etc . . .