set domain name in Debian `

From	Glenn English <ghe2001@gmail.com>
Newsgroups	linux.debian.user
Subject	set domain name in Debian `
Date	2016-11-11 21:50 +0100
Message-ID	<sCqVP-OQ-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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This seems to be a common question -- it's all over the 'Net. 

I have to change the domain name of a Jessie server I'm working on. How do you do it? (Aside from putting the FQDN in /etc/hostname, which kinda works.)

I've seen several posts on the subject, all contradicting each other, and none of them work. The answer must be in this list's archive, but I can't find it. 

The most common answer has to do with /etc/hosts, but the data is already in there (at the top, with the correct IP), and the system isn't impressed (rebooting makes no difference). Man is no help. Editing /etc/resolv.conf has no effect. Books on Debian and Linux don't help, although it seems to be trivial on RedHat.

/proc/sys/domainname says "(none)". hostname -f gives the old domain name (where does it get it). grep -ir doesn't find the old name string anywhere in /etc or in /lib.

I know it must be simple to do -- the installer does it without downloading a C library, but it must be in a secret place I don't know about...

-- 
Glenn English

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set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-11 21:50 +0100
  Re: set domain name in Debian ` Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-11 22:00 +0100
    Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-11 23:10 +0100
      Re: set domain name in Debian ` Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-11 23:40 +0100
        Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-12 04:50 +0100
      Re: set domain name in Debian ` Joe <joe@jretrading.com> - 2016-11-11 23:50 +0100
        Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-12 01:40 +0100
  Re: set domain name in Debian ` Andy Smith <andy@strugglers.net> - 2016-11-12 06:00 +0100
    Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-12 07:40 +0100
      Re: set domain name in Debian ` Andy Smith <andy@strugglers.net> - 2016-11-12 07:50 +0100
        Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-12 10:20 +0100
          Re: set domain name in Debian ` Andy Smith <andy@strugglers.net> - 2016-11-12 11:30 +0100
            Re: set domain name in Debian ` Brian <ad44@cityscape.co.uk> - 2016-11-12 13:40 +0100
            Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-12 17:10 +0100
              Re: set domain name in Debian ` sunrise@mailbug.com - 2016-11-12 19:40 +0100
                Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-12 20:30 +0100
              Re: set domain name in Debian ` Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-14 14:30 +0100
                Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-14 23:00 +0100
                Re: set domain name in Debian ` David Wright <deblis@lionunicorn.co.uk> - 2016-11-14 23:40 +0100
                Re: set domain name in Debian ` Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-15 14:10 +0100
                Re: set domain name in Debian ` Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-15 15:20 +0100
                Re: set domain name in Debian ` Brian <ad44@cityscape.co.uk> - 2016-11-15 16:00 +0100
                Re: set domain name in Debian ` Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-15 16:20 +0100
                Re: set domain name in Debian ` Brian <ad44@cityscape.co.uk> - 2016-11-15 16:40 +0100
                Re: set domain name in Debian ` David Wright <deblis@lionunicorn.co.uk> - 2016-11-15 17:10 +0100
                Re: set domain name in Debian ` Brian <ad44@cityscape.co.uk> - 2016-11-15 15:20 +0100
                Re: set domain name in Debian ` Joe <joe@jretrading.com> - 2016-11-15 16:10 +0100
                Re: set domain name in Debian ` Brian <ad44@cityscape.co.uk> - 2016-11-15 16:50 +0100
                Re: set domain name in Debian ` Joe <joe@jretrading.com> - 2016-11-15 17:30 +0100
  Re: set domain name in Debian ` Henrique de Moraes Holschuh <hmh@debian.org> - 2016-11-12 16:50 +0100
    Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-12 18:20 +0100
      Re: set domain name in Debian ` Henrique de Moraes Holschuh <hmh@debian.org> - 2016-11-12 19:40 +0100
        Re: set domain name in Debian ` Glenn English <ghe2001@gmail.com> - 2016-11-12 22:40 +0100

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