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From Alex Moundalexis <al...@cloudera.com>
Subject Re: Getting the IP Address
Date Wed, 28 Aug 2013 18:01:01 GMT
+1

Properly configured forward/reverse DNS is a rarity, even with more
experienced cluster owners.

On Wed, Aug 28, 2013 at 1:54 PM, John Vines <vines@apache.org> wrote:

> We use this similar logic throughout a lot of our scripts for determining
> the external facing IP address in a portable manner, it's just that the
> init.d scripts are a bit more strict about it. This is the equivalent of
> using the name defined in the slaves/masters/tracers/etc. files to
> determine which port to report as.
>
> Switching to a system that depends on DNS to succeed will fail for all
> first time users, which is a penalty that will not be worth it. If someone
> can find a better way to determine outward facing IP address I would love
> to have it, but unfortunately networks are hard.
>
>
> On Wed, Aug 28, 2013 at 1:44 PM, Billie Rinaldi <billie.rinaldi@gmail.com>wrote:
>
>> Good point.  I don't care if the init.d scripts work on a Mac.  I do care
>> about the other scripts, though.
>>
>>
>> On Wed, Aug 28, 2013 at 10:32 AM, Christopher <ctubbsii@apache.org>wrote:
>>
>>> But... it shouldn't be a supported platform for init scripts... I
>>> imagine.
>>>
>>> --
>>> Christopher L Tubbs II
>>> http://gravatar.com/ctubbsii
>>>
>>>
>>> On Wed, Aug 28, 2013 at 1:03 PM, Billie Rinaldi
>>> <billie.rinaldi@gmail.com> wrote:
>>> > It's a supported development platform.  =)
>>> >
>>> >
>>> > On Wed, Aug 28, 2013 at 9:59 AM, Sean Busbey <busbey@cloudera.com>
>>> wrote:
>>> >>
>>> >> hostname -i does not work on a Mac ( 10.8.4 )
>>> >>
>>> >> Is Mac a supported platform?
>>> >>
>>> >>
>>> >> On Wed, Aug 28, 2013 at 11:53 AM, Eric Newton <eric.newton@gmail.com>
>>> >> wrote:
>>> >>>
>>> >>> Does "hostname -i" work on a mac?  Not being a mac user, I can't
>>> check.
>>> >>>
>>> >>> -Eric
>>> >>>
>>> >>>
>>> >>>
>>> >>> On Wed, Aug 28, 2013 at 11:38 AM, Ravi Mutyala <ravi@hortonworks.com
>>> >
>>> >>> wrote:
>>> >>>>
>>> >>>> Hi,
>>> >>>>
>>> >>>> I see from the accumulo-tracer init.d script that IP is determined
>>> by
>>> >>>> this logic.
>>> >>>>
>>> >>>> ifconfig | grep inet[^6] | awk '{print $2}' | sed 's/addr://'
|
>>> grep -v
>>> >>>> 0.0.0.0 | grep -v 127.0.0.1 | head -n 1
>>> >>>>
>>> >>>>
>>> >>>> Any reason for using this logic instead of a hostname -i and
using
>>> >>>> reverse dns lookup? I have a cluster where the order of nics
on one
>>> of the
>>> >>>> nodes is in a different order and ifconfig returns a IP from
a
>>> different
>>> >>>> subnet than for other nodes. But DNS and reverse DNS are properly
>>> >>>> configured.
>>> >>>>
>>> >>>> Thanks
>>> >>>>
>>> >>>> CONFIDENTIALITY NOTICE
>>> >>>> NOTICE: This message is intended for the use of the individual
or
>>> entity
>>> >>>> to which it is addressed and may contain information that is
>>> confidential,
>>> >>>> privileged and exempt from disclosure under applicable law.
If the
>>> reader of
>>> >>>> this message is not the intended recipient, you are hereby notified
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>>> >>>
>>> >>>
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >> Sean
>>> >
>>> >
>>>
>>
>>
>


-- 
Alex

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