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Re: how to bring up message and prevent user login when not connected to a particular VLAN? (was: how to force mounting an entry in fstab on boot?)

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Am Mon, Oct 23, 2023 at 05:57:28PM +0200 schrieb hw:
> On Mon, 2023-10-23 at 17:40 +0200, hw wrote:
> > On Mon, 2023-10-23 at 16:53 +0200, Christoph Brinkhaus wrote:
> > > Am Mon, Oct 23, 2023 at 04:17:11PM +0200 schrieb hw:
> > > > Hi,
> > > > 
> > > > I have an entry in the fstab to mount an NFS share via IPv6.  For
> > > > unknown reasons, the entry is being ignored on boot, so after booting,
> > > > I have to log in as root and do a 'mount -a' which mounts the share
> > > > without problems.
> > > > 
> > > > The entry in the fstab looks like this:
> > > > 
> > > > 
> > > > [fd53::11]:/srv/example 		  /home/example/foo	  nfs	  _netdev      0 0
> 
> Ok, it seems to work with:
> 
> 
> ... nfs	  defaults,_netdev,x-systemd.after=network-online.target 0 0
> 
> 
> So the '_netdev' option is broken.  I'll have to see if this reboot
> was an exception, but there's no good reason to assume that it won't
> work next time, too.
> 
> So the next question remains:
> 
> > [...]
> > > > So how do I force it that the entries in fstab are not being silently
> > > > ignored?  I want these shares either mounted, like through like 3
> > > > retries, or booting to stop when they can't be mounted.
> > > > 
> > > I have never tried to implement things as 3x retries or so.
> > 
> > Well, the retries are not so relevant; I'd expect that to happen
> > anyway.  But how can I stop the booting when a mount fails?
> > 
> > Alternatively, how can I prevent booting or have the machine becoming
> > inaccessible when it's not connected to a particular VLAN?  Like the
> > users can't log in and instead get a message that the computer is
> > incorrectly connected ...
> 
> Let me add that the machines are currently unaware that they are
> connected to a VLAN because the switch ports are configured untagged.
> I could change that to tagged but I don't see how that would solve
> anything.
> 
> Unless maybe I could intervene before starting gdm by pinging a server
> and bringing up a message instead of starting gdm when the server
> can't be reached.  That should be possible, but how would I bring up a
> message instead of gdm?  It doesn't even have to be a GUI that's
> starting, just a message would suffice.  After that, automatically
> shut down after a 2 minutes or so ...
> 
I have digged a little bit because this is an interesting task. I have
tried to use the crontab of root but the messages are not printed to the
console but send by mail. For that test I have not been logged in which
seems to be your use case.

Then I have had a look at gdm. I think one option to display stuff is to
use gdm itself. The message of the greeting screen can be configured. A
restart of gdm should be enough to update the content of the screen. I
do not use gdm to try that. But I think that is at least an option.

Kind regards,
Christoph

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Thread

how to force mounting an entry in fstab on boot? hw <hw@adminart.net> - 2023-10-23 16:20 +0200
  Re: how to force mounting an entry in fstab on boot? Greg Wooledge <greg@wooledge.org> - 2023-10-23 16:40 +0200
    Re: how to force mounting an entry in fstab on boot? hw <hw@adminart.net> - 2023-10-23 17:30 +0200
      Re: how to force mounting an entry in fstab on boot? David Wright <deblis@lionunicorn.co.uk> - 2023-10-23 21:10 +0200
  Re: how to force mounting an entry in fstab on boot? Christoph Brinkhaus <c.brinkhaus@t-online.de> - 2023-10-23 17:00 +0200
    Re: how to force mounting an entry in fstab on boot? hw <hw@adminart.net> - 2023-10-23 17:50 +0200
      how to bring up message and prevent user login when not connected  to a particular VLAN? (was: how to force mounting an entry in fstab on  boot?) hw <hw@adminart.net> - 2023-10-23 18:00 +0200
        Re: how to bring up message and prevent user login when not  connected to a particular VLAN? (was: how to force mounting an entry in  fstab on boot?) Christoph Brinkhaus <c.brinkhaus@t-online.de> - 2023-10-23 19:30 +0200
          Re: how to bring up message and prevent user login when not  connected to a particular VLAN? (was: how to force mounting an entry in  fstab on boot?) hw <hw@adminart.net> - 2023-10-27 21:10 +0200
      Re: how to force mounting an entry in fstab on boot? Christoph Brinkhaus <c.brinkhaus@t-online.de> - 2023-10-23 18:10 +0200

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