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Hello,

Just an update to this issue.
I make it work by adding a DNAT iptables rule on the WNs, redirecting 
connection destined to 169.254.169.254 to <controller ip>:8773.
I thought this is taken care of by openstack automatically, maybe not? 
Or am I on the wrong track?

Thanks,
Xin

On 8/13/2012 6:03 PM, Xin Zhao wrote:
> Hello,
>
> How can I check the value of $my_ip?
>
> I notice that in the arp table on the instance, the entry for ip 
> 169.254.169.254 has a wrong mac address, which I don't see existent on 
> both the controller
> node and the worker node. After I change the entry for ip 
> 169.254.169.254 to map to the real mac address of the controller 
> host(metadata host as well),
> the curl command works. But, I don't know why the initial wrong mac 
> address gets entered into the arp table in the first place?
>
> Thanks,
> Xin
>
> On 8/10/2012 3:47 AM, tacy lee wrote:
>> Suggest check iptables-save output,Metadata_host default set to 
>> $my_ip. if you often switch network,your $my_ip maybe set wrong
>>
>> On Fri, Aug 10, 2012 at 10:31 AM, Xin Zhao <xzhao at bnl.gov 
>> <mailto:xzhao at bnl.gov>> wrote:
>>
>>     Hello,
>>
>>     In my essex install on RHEL6, there is a problem with the
>>     metadata service.
>>     The metadata service works for instances running on the
>>     controller node, where
>>     the nova-api(metadata service) is running. But for the other
>>     worker nodes,
>>     the metadata service is intermittent, ie. the instances sometimes
>>     can get its metadata,
>>     sometime it fails with errors like:
>>
>>     $> curl -v http://169.254.169.254:8775/
>>     * About to connect() to 169.254.169.254 port 8775 (#0)
>>     *   Trying 169.254.169.254... Connection timed out
>>     * couldn't connect to host
>>     * Closing connection #0
>>     curl: (7) couldn't connect to host
>>
>>     Any idea where should I start investigating this?
>>
>>     Thanks,
>>     Xin
>>
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>
>
>
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