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Groups > linux.debian.user > #262612

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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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 ...

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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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