Re: set domain name in Debian `
On Sat, Nov 12, 2016 at 08:50:46AM -0700, Glenn English wrote:
> > On Nov 12, 2016, at 3:25 AM, Andy Smith <andy@strugglers.net> wrote:
> > I am 95% confident that the reason that Glenn's system thinks the
> > FQDN is "www.slsware.dmz" is because the first instance of "srv" in
> > the /etc/hosts is:
> >
> >>> 192.168.2.203 www.slsware.dmz wsd srv
> But that isn't the first; it's the fourth. A grep of the hosts file:
Andy is correct. The line that Andy cited is the first instance of
the name "srv" as a SEPARATE WORD all unto itself.
> > root@srv:~# egrep srv /etc/hosts
> > 127.0.0.1 srv.slsware.org
Does not contain "srv" as a whole word.
> > 216.17.203.66 srv.slsware.org sso
Does not contain "srv" as a whole word.
> > # 192.168.2.203 srv.slsware.dmz srv
Is a comment. Ignored.
> > 192.168.2.203 www.slsware.dmz wsd srv
THIS one contains srv as a whole word. So when you do your "hostname -f"
(which I still contend is a rubbish command which serves no useful
purpose, but it's what you seem to want, so I'll roll with it), it
looks up "srv" in this file as a whole word/field, and finds this line
as the first match.
Therefore hostname -f writes "www.slsware.dmz" to stdout.
> > 192.168.2.203 mail.slsware.dmz msd srv
> > 192.168.2.203 ntp.slsware.dmz ntp srv
> > 192.168.2.203 ns1.slsware.dmz ns1d ns1 srv
This is just nonsense. You've got the whole word "srv" in the file
multiple times. But it can't resolve to multiple FQDNs using the
"hostname -f" resolution mechanism, which only returns the first match.
The "srv" on these lines is just noise.
I concur with the previous advice to stop using /etc/hosts for this
configuration, and move everything into DNS.
Here's my entire /etc/hosts file from my Internet-facing VPS (originally
imaged by the VPS provider as squeeze, which I have upgraded to wheezy):
greg@remote:~$ cat /etc/hosts
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
127.0.0.1 localhost.localdomain localhost
# Auto-generated hostname. Please do not remove this comment.
199.231.184.176 remote.wooledge.org remote
::1 localhost ip6-localhost ip6-loopback
This machine acts as a web server for "wooledge.org" and
"mywiki.wooledge.org" and yet neither of those names appears in
/etc/hosts. Why should they? They are only meaningful to the web
server. They are defined in DNS.
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