 | | | Notifications email failure - SOLVED | Notifications email failure - SOLVED 2005-09-08 - By Garrick Staples
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On Thu, Sep 08, 2005 at 11:05:34AM -0700, Roger Pe?a Escobio alleged:
>
>
> --- Garrick Staples <garrick@(protected)> wrote:
>
> > On Thu, Sep 08, 2005 at 09:11:31AM -0700, Jeff Boyce
> > alleged:
> > > This is a two part solution. First I changed my
> > /etc/hosts file by adding
> > > bison to the local host line, which now reads:
> > > 127.0.0.1 bison localhost.localdomain
> > localhost
> >
> > Ooo, that's probably going to break something else.
> > You want localhost
> > to have matching forward and reverse name lookups.
> >
> > I've always disagreed with Red Hat's convention of
> > "127.0.0.1
> > localhost.localdomain localhost" and always change
> > it to "127.0.0.1
> > localhost localhost.localdomain". Putting your
> > hostname at the end of
> > the 127.0.0.1 line is acceptable, but putting in at
> > the beginning is a
> > ticking bomb.
> >
> I am sorry my ignorance but why?
>
> I always follow the rule of first the fully qualify
> hostname then the alias of that host
> sometimes I have more than one line with the same IP
> number but different hostnames
>
> now it looks that I am wrong so I just want to know
> why :-)
I agree with your rule, and follow it myself.
But "localhost" is special. It is very commonly used in lots of configs
and programs. It should have matching forward/reverse for all of the
apps that require it. Your FQDN should also have matching
forward/reverse. "localhost.localdomain" is never used by anyone.
I suppose if the host has a dynamic IP, and you want to name it
something other than "localhost" or the ISP-supplied reverse of the IP,
it would seem reasonable to put the hostname first on the 127.0.0.1
line.
My linux NAT box at home has "127.0.0.1 localhost" and the hostname with
the internal RFC IP in /etc/hosts.
Obviously other people will disagree with me.
--
Garrick Staples, Linux/HPCC Administrator
University of Southern California
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