Re: FQDNs for netbooted hosts via DHCP?

[Roy Marples <roy%marples.name@localhost>]

On 16/07/2018 04:17, John D. Baker wrote:
> On Sun, 15 Jul 2018, John D. Baker wrote:
>
> > On Mon, 16 Jul 2018, Roy Marples wrote:
> >
> > > Sadly, all my machines are x86 based. I have an ERLITE mips router where I
> > > also run dhcpcd, and it doesn't stamp on routes there either, so I'm pretty
> > > sure this isn't an arch issue ... but I could be wrong.
> >
> > The only route that was an issue was the local route to the NFS server.
> > Somehow a netbooted x86 system can complete the configuration, but
> > non-x86 dies as soon as 'dhcpcd' (or the earlier 'dhclient') touches
> > the interface.  Interface is downed, root file system is gone, can't
> > bring interface back up, game over.
> >
> > I've got a fresh build of -current just installed for the netbooted
> > Lemote YeeLoong.  Need to give it a whirl with "dhcp" in the
> > "ifconfig.rtk0" file and see if the situation has changed.
>
> Well, what do you know!  The YeeLoong successfully used 'dhcpcd' upon
> netbooting.  And with "env force_hostname=YES", it gets an FQDN instead
> of its short name (only).
>
> And a SPARCstation 5 netbooting -8 has just done the same.  Looks like
> a winner.

Great news!

After thinking about it some more, I think the best solution for the 
FQDN is to either fix the DHCP server to send the domain in the hostname 
field OR stop the kernel assigning a hostname OR leave things as they are.

I don't feel comfortable changing dhcpcd here because it now has the 
potential to flip-flop the hostname in a badly configured environment 
AND override the users default choice of setting a short hostname in 
rc.conf.

"env force_hostname=YES" has it's own pitfall of flip-flopping in the 
same way, but that's your adminsitrative decision based on your network 
setup.

BTW, sending the FQDN in the hostname option is RFC compliant but I 
understand your frustrations because there is no easy way to do that in 
your DHCP server.

Anyone have any preference on a course of action here?

Roy