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20040324: Unidata LDM feeds for Vietnam (cont.)

>From: Mai Nguyen <address@hidden>
>Organization: National Center for Hydro-Meteorological Forecasting of Vietnam
>Keywords: 200312020023.hB20N4p2027742 IDD LDM Linux

Mai,

>Thanks for your supports.

No worries.  We are glad to help when we can.

>These are the most that I can remember.
>
>+ I checked very carefully with the IPs. They seem ok.
>But the ethernet never activates itself after
>rebooting. So normally I have to go into Network in
>System setting to activate the connections. That was
>the reason why you couldn't log on my computer
>yesterday, since my workmate rebooted the computer
>before he has gone home without checking the
>connection.

So, the automatic start of networking at boot time
was not setup/setup correctly.

>+ I came to Authentication option. Changed the option
>to use Keberoos (something like that), there 
>have been some parameters in the textboxes. I think I
>wiped them clear. I've done that because when logged
>in from other computer, I always got the message
>something like: "the KDS (or KDC) can't recognize
>..initial credentials "

We are wondering why you chose to turn on Kerberos?
We do not use it here, so our experience with it
is minimal.

>+ Changed Security to medium (from NO FIREWALL) 
>Nothing happened immediately until I reboot again.

Kerberos and changing the firewall may be the cause
of your problems.

>Hope tomorow will be a better day.

Yes.  Here is what to do (you need to be at the computer to do
these steps):

1) reboot

2) it is likely that you are using the 'grub' OS loader.  If yes,
   you should be looking at a screen that gives you one or more
   options for starting Linux.  If you read the text shown on
   this screen, it should say that you can press 'e' to edit
   boot-up options.  Press 'e' before the system continues booting
   on its own (there is a count down of 10 seconds and then booting
   will continue unless you hit certain keys like 'e')

3) you should next be looking at a list of options for boot.  The
   first option should begin with 'root', and the second will begin
   with 'kernel' and followed by kernel options.  There may be a third
   line, a fourth, etc.  Linux allows you to keep more than one kernel
   on the disk and select which one you want to boot from.

   Use the down arrow key to select the first 'kernel' in the list
   (not the line that begins with 'root') and hit the 'Enter' key.

4) you will now be looking at a long line of stuff related to booting
   the first kernel in the list from 3).  You want to type:

   <space> single

   That is a single space followed by 'single', then press the
   'Enter' key.  You will then be looking at the same screen
   that you were at the beginning of 3).  You can either wait
   for booting to continue after 10 seconds, or press 'b'.

At this point, the machine will begin booting.  Instead of coming
up into multi-user mode, however, it should stop at a command line
prompt and wait for your input.

At this point you will be doing things as 'root'.  Here is what 
you do:

5) rename the firewall configuration file:

mv /etc/sysconfig/iptables /etc/sysconfig/iptables-

6) edit the /etc/nsswitch.conf file and change the line that begins
   with 'passwd' so that it looks like:

passwd:   files nisplus

At this point, you should be able to let the machine continue booting
into multi-user mode:

7) type 'exit' at the command line prompt

If all goes as we think it should, the system should come up with
the login screen you are used to, and you should be able to login
as 'root'.  If there really was a problem logging in as the user
'ldm' -- meaning that the password isn't accepted --, then you
can set the password for 'ldm'.  Before logging in as 'root', however,
I would check to see if you can login as 'ldm' or 'nawips'.

After you have the 'ldm' login working again, you should pay attention
to why networking is not being automatically started on reboot.

Please do not turn on Kerberos or the firewall just yet.

>Bye for now Tom

Please let us know the results of the above.

Cheers,

Tom
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