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From John Vines <vi...@apache.org>
Subject Re: Getting the IP Address
Date Wed, 28 Aug 2013 19:03:48 GMT
Christopher,

It's not a matter of determining which port to bind to. It's for recording
it's location in zookeeper so other nodes can find it.


On Wed, Aug 28, 2013 at 3:00 PM, Christopher <ctubbsii@apache.org> wrote:

> I'm not sure this is even very portable. It relies on a specific
> ifconfig display format intended for human-readability, and I'm not
> sure that's entirely guaranteed to be static over time. It also won't
> work if there are multiple public interfaces. It also don't think it
> works for infiniband or other interface types that have issues in
> ifconfig.
>
> I think we have to make *some* assumptions that things like
> "networking" is properly configured using standard utilities for
> name-mapping (like DNS or /etc/hosts). I think it's more confusing for
> sysadmins if we have these sorts of automatic behaviors that are
> non-standard and unexpected (like automatically binding to a single,
> arbitrarily chosen, public IP out of the box).
>
> Honestly, though, I'm not sure why we need to be resolving public IP
> addresses *at all*. It should be configured explicitly, and bind to
> either 127.0.0.1 or 0.0.0.0 by default (to satisfy the ease for
> first-time users).
>
>
> --
> Christopher L Tubbs II
> http://gravatar.com/ctubbsii
>
>
> 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
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> >>> >>>
> >>> >>>
> >>> >>
> >>> >>
> >>> >>
> >>> >> --
> >>> >> Sean
> >>> >
> >>> >
> >>
> >>
> >
>

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