www.devco.net by r.i.pienaar

RightScale facts

I'm trying to build up a nice demo of mcollective and trying to save some effort by using the RightScale CentOS AMI's.  I noticed they came with a nice script to pull down the user data and meta data so figured I might as well make some facts.

require 'find'
 
if File.exists?("/var/spool/ec2/meta-data")
    Find.find("/var/spool/ec2/meta-data") do |path|
        filename = File.basename(path)
        factname = "ec2_#{filename}"
 
        factname.gsub!(/-/, "_")
 
        if File.file?(path)
            lines = File.readlines(path)
 
            if lines.size == 1
                Facter.add(factname) do
                    setcode { lines.first.chomp.to_s }
                end
            else
                lines.each_with_index do |line, i|
                    Facter.add("#{factname}_#{i}") do
                        setcode { lines[i].chomp }
                    end
                end
            end
        end
    end
end
 
if File.exists?("/var/spool/ec2/user-data.raw")
        lines = File.readlines("/var/spool/ec2/user-data.raw")
 
        lines.each do |l|
                if l.chomp =~ /(.+)=(.+)/
                    f = $1; v = $2
 
                    Facter.add(f) do
                        setcode { v }
                    end
                end
        end
end

If you arrange to run /opt/rightscale/bin/ec2.sh in rc.local and pop this fact above into your factdir you should be able to access all the meta data from facter.

# facter -p
ec2_ami_id => ami-73270c07
ec2_ami_launch_index => 0
ec2_ami_manifest_path => pinetecltd-centos-clustera/cluster-webserver-1257783713.manifest.xml
ec2_ancestor_ami_ids_0 => ami-31c72258
ec2_ancestor_ami_ids_1 => ami-ef01e486
ec2_ancestor_ami_ids_2 => ami-0916f360
ec2_ancestor_ami_ids_3 => ami-c8ac48a1
ec2_ancestor_ami_ids_4 => ami-cd52b6a4
ec2_ancestor_ami_ids_5 => ami-19be966d
ec2_ancestor_ami_ids_6 => ami-65200b11
ec2_ancestor_ami_ids_7 => ami-3d200b49
ec2_ancestor_ami_ids_8 => ami-91200be5
ec2_ancestor_ami_ids_9 => ami-81200bf5
ec2_block_device_mapping_ami => sda1
ec2_block_device_mapping_ephemeral0 => sdb
ec2_block_device_mapping_ephemeral1 => sdc
ec2_block_device_mapping_ephemeral2 => sdd
ec2_block_device_mapping_ephemeral3 => sde
ec2_block_device_mapping_root => /dev/sda1
ec2_block_device_mapping_swap => sda3
ec2_hostname => ip-10-227-43-134.eu-west-1.compute.internal
ec2_instance_action => none
ec2_instance_id => i-9411e7e3
ec2_instance_type => m1.small
ec2_kernel_id => aki-7e0d250a
ec2_local_hostname => ip-10-227-43-134.eu-west-1.compute.internal
ec2_local_ipv4 => 10.227.43.134
ec2_placement_availability_zone => eu-west-1b
ec2_public_hostname => ec2-79-125-33-224.eu-west-1.compute.amazonaws.com
ec2_public_ipv4 => 79.125.33.224
ec2_public_keys_0_openssh_key => ssh-rsa AAA
ec2_ramdisk_id => ari-7d0d2509
ec2_reservation_id => r-c655bab1
ec2_security_groups_0 => rip
ec2_security_groups_1 => defaultcluster => a

In addition if you just pass nice key=val pairs in as user data it will add those as facts too, the last above is from that.