Re: Startup network scripts

[Ajit Warrier <unixajit yahoo com>]

Well, thanks for the help anyway, Rick. And for your
time!

I will keep trying stuff out, and if I manage to get
it right, I will post it out on the list.

Ajit

--- Rick Stevens <rstevens vitalstream com> wrote:
> Ajit Warrier wrote:
> > --- Rick Stevens <rstevens vitalstream com> wrote:
> > 
> >>Ajit Warrier wrote:
> >>
> >>>I have set dhclient so that it now does send the
> >>
> >>name
> >>
> >>>to the DHCP server and consequently gets
> >>
> >>registered in
> >>
> >>>the DNS server as well. Now when I run dhclient
> >>
> >>from
> >>
> >>>the terminal, it does everything correctly as
> >>>described. So that's a success!
> >>>
> >>>However, when I restart the RHL9 unit, it once
> >>
> >>again
> >>
> >>>does not register the name. Once it has rebooted,
> >>
> >>if I
> >>
> >>>run dhclient from the terminal, it registers the
> >>
> >>name
> >>
> >>>with the servers.
> >>
> >>The dreaded chicken-and-egg thing.  You don't get
> a
> >>hostname the first
> >>time because you didn't ask for one.  The second
> >>time, you've set
> >>a host name so you send it to the DHCP server and
> it
> >>works.
> > 
> > 
> > ******************************
> > But by setting it in dhclient.conf am I not asking
> for
> > the hostname to be sent? I do know that when I run
> > dhclient explicitly the name _is_ getting
> registered
> > so that means that dhclient is indeed sending a
> name
> > and the DHCP-DNS server are accepting it. Then why
> is
> > it that dhclient does not do the same thing when
> the
> > computer is booting up?
> > I also looked at
> /etc/sysconfig/network-scripts/ifup.
> > There is a section there that suggests that it is
> > looking for the DHCP name to send first in
> something
> > called PUMPARGS, then in DHCPCDARGS and finally in
> > dhclient. That section is like this - 
> > 
> >     if [ -n "${DHCP_HOSTNAME}" ]; then
> >        # Send a host-name to the DHCP server
> (requ. by
> > some dhcp servers).
> >        PUMPARGS="${PUMPARGS} -h ${DHCP_HOSTNAME}"
> >        DHCPCDARGS="${DHCPCDARGS} -h
> ${DHCP_HOSTNAME}"
> >        if [ -x /sbin/dhclient ] ; then
> >           if [ -w /etc/dhclient-${DEVICE}.conf ] ;
> > then
> >              if ! grep "send *host-name
> > *\"${DHCP_HOSTNAME}\""
> /etc/dhclient-${DEVICE}.conf >
> > /dev/null 2>&1 ; then
> >                 echo "send host-name
> > \"${DHCP_HOSTNAME}\";  # temporary RHL ifup
> addition"
> > 
> >>>/etc/dhclient-${DEVICE}.conf
> > 
> >              fi
> >           elif ! [ -e /etc/dhclient-${DEVICE}.conf
> ] ;
> > then
> >              echo "send host-name
> > \"${DHCP_HOSTNAME}\";  # temporary RHL ifup
> addition"
> > 
> >>>/etc/dhclient-${DEVICE}.conf
> > 
> >           fi
> >        fi
> >     fi
> > 
> > Does this mean that it is lookinf for the info in
> a
> > file like dhclient-eth0.conf?
> 
> It could be.  To be honest, I don't use dhclient
> often and certainly
> not in they way you're using it.  I don't have an
> environment to test
> in at this time.
> 
> The "if [ -w /etc/dhclient-${DEVICE}.conf ]" bit
> sure looks like it
> wants to update the hostname, but I'd really need to
> set this up and
> watch it to tell you exactly what's going on.
>
----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer    
> rstevens vitalstream com -
> - VitalStream, Inc.                      
> http://www.vitalstream.com -
> -                                                   
>                 -
> - Millihelen, adj: The amount of beauty required to
> launch one ship. -
>
----------------------------------------------------------------------
> 
> 
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