Issue #7559 has been updated by Jeff McCune.

James Turnbull wrote:
> As far as I can see we've investigated all the other approaches with 
> customers and AWS (much of that is in this ticket - thanks to C Lang and 
> others) and have not been able to find resolution. At this stage I'd say 
> we're stumped.  Barring someone coming up with a genius idea, I'd recommend 
> at this stage that we re-evaluate discussions about a hint system like Ohai's 
> (https://github.com/opscode/ohai/blob/master/lib/ohai/system.rb#L106).

James, how does this hint system differ from the functionality we provide today 
in facter_dot_d in the standard library?

-Jeff
----------------------------------------
Feature #7559: Fact for identifying Amazon VPC instances.
https://projects.puppetlabs.com/issues/7559#change-78128

Author: Nigel Kersten
Status: Needs Decision
Priority: Normal
Assignee: eric sorenson
Category: library
Target version: 
Keywords: vpc ec2 arp
Branch: https://github.com/puppetlabs/facter/pull/290
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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