CentOS - Apr 2016 - How to set hostname and domainnmae in CentOS 7?

Not sure about everyone else, but I always put my hostname in /etc/hosts.
Maybe that's from years of not always having DNS available back when the
earth was cooling.


On Apr 5, 2016 16:30, "James Hogarth" <james.hogarth at
gmail.com> wrote:
> On 5 April 2016 at 20:24, Joe Smithian <joe.smithian at gmail.com>
wrote:
>
> > We can permanently set hostname using  hostnamectl set-hostname. How
can
> we
> > permanently set *domain name* in CentOS 7?
> > I found an article
> > <
> >
>
http://unix.stackexchange.com/questions/239920/how-to-set-the-fully-qualified-hostname-on-centos-7-0
> > >
> > that recommended setting FQDN using hostnamectl. Is that the right way
to
> > set hostname and domainname at the same time using *hostnamectl
> > set-hostname* command?
> >
> >  Running *hostnamectl set-hostname* will set the hostname in*
> > /etc/hostname*
> > but it doesn't change */etc/hosts*. What's the proper way of
adding
> > hostname and FQDN to */etc/hosts *in CentOS 7?
> >
> >
> Technically speaking one shouldn't put the hostname in /etc/hosts as
it's
> not required so long as your DNS is working ... which it should be ...
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On 6 April 2016 at 15:45, Mark Haney <mark.haney at vifprogram.com> wrote:
> Not sure about everyone else, but I always put my hostname in /etc/hosts.
> Maybe that's from years of not always having DNS available back when
the
> earth was cooling.
>
>
This behaviour plays havoc with templated VMs though or any time you can't
be sure the IP there will be correct ...

At which point you start having to script fixing it etc or weird things
happen.

I can't recall if it hit EL7 yet but Fedora has nss-myhostname so it'll
probably arrive in EL7 eventually to ensure the local hostname is always
resolvable to the system IP if it exists or at least   127.0.0.2 so stuff
relying on gethostname() doesn't have issues and  the older /etc/hosts
shenanigans are not required.

On 4/6/2016 11:34 AM, James Hogarth wrote:
> On 6 April 2016 at 15:45, Mark Haney<mark.haney at vifprogram.com> 
wrote:
>
>> >Not sure about everyone else, but I always put my hostname in
/etc/hosts.
>> >Maybe that's from years of not always having DNS available back
when the
>> >earth was cooling.
>> >
>> >
> This behaviour plays havoc with templated VMs though or any time you
can't
> be sure the IP there will be correct ...
indeed, most all my servers except a few key infrastructure servers are 
configured with DHCP reservations.



-- 
john r pierce, recycling bits in santa cruz