Re: New nomeclature of ethernet devices

From	Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups	linux.debian.user
Subject	Re: New nomeclature of ethernet devices
Date	2019-06-25 15:50 +0200
Message-ID	<ycTZE-Vs-15@gated-at.bofh.it> (permalink)
References	(2 earlier) <ycPCG-6Uc-5@gated-at.bofh.it> <ycSAx-cU-3@gated-at.bofh.it> <ycT3z-mb-1@gated-at.bofh.it> <ycTmV-I6-3@gated-at.bofh.it> <ycTPX-RV-3@gated-at.bofh.it>
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On Tue, Jun 25, 2019 at 09:30:59AM -0400, Michael Stone wrote:
> On Tue, Jun 25, 2019 at 09:05:30AM -0400, Greg Wooledge wrote:
> > Debian's defaults are a bit baffling sometimes.  They assumed a mobile
> > device when they decided to put "allow-hotplug" on your wired ethernet
> > interfaces, which breaks everything under the sun on traditional
> > servers or workstations in a work environment.
> 
> How? If the interface is in the system then allow-hotplug and auto are
> synonyms. I have not observed the breakage in hundreds of servers.

With the default "allow-hotplug eth0" (or whatever interface name)
setting, the NFS server will typically come up before DNS lookups are
possible.  When the NFS server starts up, it attempts to look up all
of the client hostnames in /etc/exports.  This is the *one* and *only*
time the NFS server will perform this lookup.  If the lookups fail at
this time, the NFS server will not share anything with anyone, ever.
(Until you notice the problem, and manually restart the NFS server.
A mere exportfs -a will not suffice.  It has to be a full restart.)

NIS has similar issues.  If ypbind can't contact its NIS server when
you try to start it, well, that's just too bad.  ypbind gives up and
dies, and it is not respawned.  I hope you weren't planning to login
to that machine with an NIS account.

I did say *traditional*.  I know all you young kiddies are saying "but but
but but nobody uses NIS or NFS any more, it's like, so OLD, bro, it's from
like a previous DECADE".  Well, they're still in use.  This I promise you.

And allow-hotplug breaks them.  A lot.

(I'm sure there are other services that break when allow-hotplug prevents
them from doing name lookups or whatever at boot time, but these are
the two big ones for me.)

Thread

New nomeclature of ethernet devices Hans <hans.ullrich@loop.de> - 2019-06-25 10:10 +0200
  Re: New nomeclature of ethernet devices <tomas@tuxteam.de> - 2019-06-25 10:50 +0200
    Re: New nomeclature of ethernet devices Hans <hans.ullrich@loop.de> - 2019-06-25 11:10 +0200
      Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-25 14:20 +0200
        Re: New nomeclature of ethernet devices The Wanderer <wanderer@fastmail.fm> - 2019-06-25 14:50 +0200
          Re: New nomeclature of ethernet devices Greg Wooledge <wooledg@eeg.ccf.org> - 2019-06-25 15:10 +0200
            Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-25 15:40 +0200
              Re: New nomeclature of ethernet devices Greg Wooledge <wooledg@eeg.ccf.org> - 2019-06-25 15:50 +0200
          Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-25 15:30 +0200
            Re: New nomeclature of ethernet devices Dan Purgert <dan@djph.net> - 2019-06-25 16:10 +0200
              Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-25 17:10 +0200
                Re: New nomeclature of ethernet devices Nate Bargmann <n0nb@n0nb.us> - 2019-06-25 17:40 +0200
              Re: New nomeclature of ethernet devices Nate Bargmann <n0nb@n0nb.us> - 2019-06-25 17:40 +0200
              Re: New nomeclature of ethernet devices Nicholas Geovanis <nickgeovanis@gmail.com> - 2019-06-26 01:10 +0200
            Re: New nomeclature of ethernet devices The Wanderer <wanderer@fastmail.fm> - 2019-06-26 02:00 +0200
              Re: New nomeclature of ethernet devices Richard Owlett <rowlett@cloud85.net> - 2019-06-26 12:40 +0200
              Re: New nomeclature of ethernet devices Dan Purgert <dan@djph.net> - 2019-06-26 12:40 +0200
              Re: New nomeclature of ethernet devices Greg Wooledge <wooledg@eeg.ccf.org> - 2019-06-26 14:20 +0200
                Re: New nomeclature of ethernet devices Stefan Monnier <monnier@iro.umontreal.ca> - 2019-06-26 16:10 +0200
                Re: New nomeclature of ethernet devices Reco <recoverym4n@enotuniq.net> - 2019-06-26 16:40 +0200
              Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-26 21:00 +0200
                Re: New nomeclature of ethernet devices The Wanderer <wanderer@fastmail.fm> - 2019-06-27 02:10 +0200
                Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-27 13:40 +0200
              Re: New nomeclature of ethernet devices David Wright <deblis@lionunicorn.co.uk> - 2019-06-27 04:30 +0200
                Re: New nomeclature of ethernet devices Ric Moore <wayward4now@gmail.com> - 2019-06-27 09:00 +0200
                Re: New nomeclature of ethernet devices David Wright <deblis@lionunicorn.co.uk> - 2019-06-27 16:10 +0200
          Re: New nomeclature of ethernet devices "Martin S. Weber" <Ephaeton@gmx.net> - 2019-06-25 20:30 +0200
            Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-25 21:00 +0200
      Re: New nomeclature of ethernet devices David Wright <deblis@lionunicorn.co.uk> - 2019-06-25 20:10 +0200
        Re: New nomeclature of ethernet devices Greg Wooledge <wooledg@eeg.ccf.org> - 2019-06-25 20:30 +0200
    Re: New nomeclature of ethernet devices Richard Owlett <rowlett@cloud85.net> - 2019-06-25 12:10 +0200
      Re: New nomeclature of ethernet devices <tomas@tuxteam.de> - 2019-06-25 12:20 +0200
      Re: New nomeclature of ethernet devices Hans <hans.ullrich@loop.de> - 2019-06-25 13:00 +0200
        Re: New nomeclature of ethernet devices <tomas@tuxteam.de> - 2019-06-25 13:20 +0200
          Re: New nomeclature of ethernet devices Hans <hans.ullrich@loop.de> - 2019-06-25 13:40 +0200
            Re: New nomeclature of ethernet devices <tomas@tuxteam.de> - 2019-06-25 13:50 +0200
            Re: New nomeclature of ethernet devices Curt <curty@free.fr> - 2019-06-25 14:20 +0200
          Re: New nomeclature of ethernet devices Celejar <celejar@gmail.com> - 2019-06-26 00:10 +0200
            Re: New nomeclature of ethernet devices The Wanderer <wanderer@fastmail.fm> - 2019-06-26 01:40 +0200
              Re: New nomeclature of ethernet devices Celejar <celejar@gmail.com> - 2019-06-26 01:50 +0200
      Re: New nomeclature of ethernet devices Stefan Monnier <monnier@iro.umontreal.ca> - 2019-06-25 18:10 +0200
        Re: New nomeclature of ethernet devices David Wright <deblis@lionunicorn.co.uk> - 2019-06-25 18:30 +0200
        Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-25 18:30 +0200
          Re: New nomeclature of ethernet devices Stefan Monnier <monnier@iro.umontreal.ca> - 2019-06-25 22:30 +0200
            Re: New nomeclature of ethernet devices Michael Stone <mstone@debian.org> - 2019-06-25 22:30 +0200

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