Issue #7559 has been updated by Michael Arnold.

Dara Adib wrote:
> <cite>Why don’t we just solve this problem the simple way and query for the 
> availability of the service endpoint?</cite>
> 
> James mentioned in an earlier comment that doing so would introduce a delay 
> for non-EC2 users until facter times out. True, the timeout limit could be 
> reduced, but I'm guessing that's not really ideal.

I am not clear on why a delay would be more of an impact than broken facts.  
Getting the correct facts is of greater importance to me than how long it takes 
to run facter.

----------------------------------------
Feature #7559: Fact for identifying Amazon VPC instances.
https://projects.puppetlabs.com/issues/7559#change-78256

Author: Nigel Kersten
Status: Accepted
Priority: Normal
Assignee: 
Category: library
Target version: 
Keywords: vpc ec2 arp
Branch: 
Affected Facter version: 1.6.10


(From the list)

 I ran into a buglet in facter 1.5.9rc6 (from tmz repo).  In normal AWS
instances it works great.  In VPC instances if doesn't work.  This seems
to be because VPC instances don't use the fe:ff:ff:... MAC addresses.

<pre>
/sbin/ifconfig
eth0      Link encap:Ethernet  HWaddr 02:67:4E:E1:26:30
         inet addr:172.17.129.24  ...


/sbin/arp
Address          HWtype  HWaddress          Flags  Mask  Iface
169.254.169.253  ether   02:67:4E:C0:00:01  C      eth0
172.17.128.1     ether   02:67:4E:C0:00:01  C      eth0


/sbin/ifconfig
eth0      Link encap:Ethernet  HWaddr 02:67:4E:DA:58:16
         inet addr:172.17.128.126

/sbin/arp
Address          HWtype  HWaddress          Flags  Mask  Iface
169.254.169.253  ether   02:67:4E:C0:00:01  C      eth0
172.17.128.1     ether   02:67:4E:C0:00:01  C      eth0
</pre>


Of the two VPC EC2 instances I've seen, the MAC address always start
with 02:67:4E.  I have only seen two instances, both in the same VPC, so
I don't know if this holds for every VPC instance, YMMV.


in ec2.rb , the following seemed to work:
<pre>
def has_euca_mac?
 !!(Facter.value(:macaddress) =~ %r{^02:67:4[eE]:})
end
</pre>


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