CentOS - Aug 2018 - Mail has quit working

Added back the IPV6 to /etc/hosts a couple days ago for grins and giggles.
No longer getting IPV6 errors in logwatch for bind. Everything working.

I think removing my ISP's nameservers from /etc/resolv.conf was the fix.
They have been in there forever so still have my fingers crossed.

Again, many thanks!!

On 08/29/2018 06:54 PM, TE Dukes wrote:
> Added back the IPV6 to /etc/hosts a couple days ago for grins and giggles.
> No longer getting IPV6 errors in logwatch for bind. Everything working.
>
> I think removing my ISP's nameservers from /etc/resolv.conf was the
fix.

I just caught up on the thread.? It looks like the core issue was never 
actually resolved:? "getent hosts localhost" still doesn't return
the
expected result, right?

 ??? $ getent hosts localhost
 ??? ::1???????????? localhost localhost.localdomain localhost6 
localhost6.localdomain6
 ??? $ grep ^hosts /etc/nsswitch.conf
 ??? hosts:????? files dns myhostname

If you're not getting the expected result from "getent", and if
your
nsswitch.conf lists "files", then glibc is somehow broken.? "rpm
-V
glibc" might tell you how, or it might not.? Could be that glibc can't 
load /lib64/libnss_files.so.2.

In any case, DNS is now providing you with a result for "localhost",
and
that'll work around most of the problems, but you really should take 
steps to fix glibc.? With something that low-level broken, I'd urge you 
to build a new system from scratch, and automate the build with some 
configuration management tool this time, so that the next time you need 
to rebuild, you can do it quickly.

> -----Original Message-----
> From: CentOS [mailto:centos-bounces at centos.org] On Behalf Of Gordon
> Messmer
> Sent: Thursday, August 30, 2018 6:23 PM
> To: centos at centos.org
> Subject: Re: [CentOS] Mail has quit working
> 
> On 08/29/2018 06:54 PM, TE Dukes wrote:
> > Added back the IPV6 to /etc/hosts a couple days ago for grins and
giggles.
> > No longer getting IPV6 errors in logwatch for bind. Everything
working.
> >
> > I think removing my ISP's nameservers from /etc/resolv.conf was
the fix.
> 
> 
> I just caught up on the thread.  It looks like the core issue was never
> actually resolved:  "getent hosts localhost" still doesn't
return the
> expected result, right?
> 
>      $ getent hosts localhost
>      ::1             localhost localhost.localdomain localhost6
> localhost6.localdomain6
Its returning exactly as above 
>      $ grep ^hosts /etc/nsswitch.conf
>      hosts:      files dns myhostname
> 
Its returning: files dns
> If you're not getting the expected result from "getent", and
if your
> nsswitch.conf lists "files", then glibc is somehow broken. 
"rpm -V
> glibc" might tell you how, or it might not.  Could be that glibc
can't
> load /lib64/libnss_files.so.2.
> 
rpm -V returns nothing.

> In any case, DNS is now providing you with a result for
"localhost", and
> that'll work around most of the problems, but you really should take
> steps to fix glibc.  With something that low-level broken, I'd urge you
> to build a new system from scratch, and automate the build with some
> configuration management tool this time, so that the next time you need
> to rebuild, you can do it quickly.
> _______________________________________________
Thanks for the follow up!!