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Re: Multiple host names for a single server?

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On Mon, Jan 07, 2019 at 10:13:03AM -0600, Tom Browder wrote:
> I would like to use a single server for multiple remote services
> including mail, bind dns, OpenStreep tiles, etcs., all with different
> subdomain names but sharing the same server and IP.  For example:
> 
>   mail.example.com
>   ns1.example.com
>   tiles.example.com
>   ...
> 
> I know I can define them with individual A records (with the same IP)
> with my domain host provider, but will that cause problems conflicting
> with a single physical hostname of, say, "pluto.example2.net"?
> 
> In other words, is the physical hostname of any server of any
> importance except for logged in users?

The actual hostname as set in /etc/hostname does not have to match any
of the various DNS A records, although it will save you some Sanity
points if it does.

The primary purpose of the actual hostname is for you to be able to
identify *which* computer is having a problem.  E.g. if you receive an
email from a machine identifying itself as "www.yourdomain" but you have
three such web servers operating as a round robin, then you will have
to put in some work to figure out which of the three it came from.

But if the email comes from a machine which self-identifies as
"www1.yourdomain", then you have a better idea where to fix the issue.

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Thread

Multiple host names for a single server? Tom Browder <tom.browder@gmail.com> - 2019-01-07 17:20 +0100
  Re: Multiple host names for a single server? Greg Wooledge <wooledg@eeg.ccf.org> - 2019-01-07 17:30 +0100
    Re: Multiple host names for a single server? Tom Browder <tom.browder@gmail.com> - 2019-01-07 18:50 +0100
  Re: Multiple host names for a single server? john doe <johndoe65534@mail.com> - 2019-01-07 17:30 +0100
    Re: Multiple host names for a single server? Tom Browder <tom.browder@gmail.com> - 2019-01-07 18:50 +0100
      Re: Multiple host names for a single server? Kushal Kumaran <kushal@locationd.net> - 2019-01-07 19:30 +0100
        Re: Multiple host names for a single server? Tom Browder <tom.browder@gmail.com> - 2019-01-07 22:20 +0100
      Re: Multiple host names for a single server? Andy Smith <andy@strugglers.net> - 2019-01-07 23:20 +0100
        Re: Multiple host names for a single server? Tom Browder <tom.browder@gmail.com> - 2019-01-07 23:40 +0100
  Re: Multiple host names for a single server? Joe <joe@jretrading.com> - 2019-01-07 17:40 +0100
    Re: Multiple host names for a single server? Tom Browder <tom.browder@gmail.com> - 2019-01-07 18:50 +0100
  Re: Multiple host names for a single server? Thomas Pircher <thp+debian@p5r.uk> - 2019-01-07 18:00 +0100

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