[CentOS] System Start-Up Issue Progress

Tue Jul 4 20:42:06 UTC 2017
Alexander Dalloz <ad+lists at uni-x.org>

Am 04.07.2017 um 19:13 schrieb Gordon Messmer:
> On 07/04/2017 09:21 AM, Chris Olson wrote:
>> It remains a mystery what could have happened during a standard yum
>> update of the system to cause this domain and/or host related sendmail
>> issue.
> Run "hostname".  Has the hostname changed?  Run "ls -l /etc/hosts 
> /etc/resolv.conf".  Have those files changed recently?
> It's possible that this system was working in the past because its 
> hostname was set up in DNS, and was removed.  In that case, the problem 
> wasn't related to "yum."   sendmail would (IIRC) continue working after 
> the system's hostname was removed from DNS, until the next time the 
> system rebooted.

Sendmail demands a hostname with at least a single dot in it. "computer" 
is in no way a valid FQDN. "computer.localdomain" would be fine and if 
it has an entry in /etc/hosts.