[LON-CAPA-admin] system will not boot

robmock at msu.edu robmock at msu.edu
Fri Jun 29 14:05:48 EDT 2007

Thanks, Guy.
This was good news, actually.
My school is switching service providers and they warned us they'd be 
messing with the network drop in my room by the middle of July, so I guess 
they're ahead of schedule.
I will begin the delightful process of nagging them for i.p., gateway, etc. 
and hopefully the brs box will be up and running soon.

----- Original Message ----- 
From: "Guy Albertelli II" <guy at albertelli.com>
To: <lon-capa-admin at mail.lon-capa.org>
Sent: Friday, June 29, 2007 1:45 PM
Subject: Re: [LON-CAPA-admin] system will not boot

> Hi Rob,
>> Without making any changes to our system, it now locks up starting
>> httpd and gives the warning:
>> module perl_mod already loaded, skipping.
>> We've seen this error in the past, but it kept on going and
>> everything went fine, but now the machine hangs up at this spot.
>> Has anyone seen this before?
> My guess is that the network setup is wrong in some way.
> The quick fix is to boot it with no network cables attached.
> At webserver startup (in 2.3 and earlier) the webserver does a
> hostname lookup on everything in the hosts.tab file.
> For a system that has a malconfigured network, this can take a long
> time to finish (as the failure time for a hostname lookup can be
> over a minute per hostname.)
> As the number of hosts in the hosts.tab file is large (over 100) this
> means it can take over 100 minutes to startup when there is a bad
> network setup in which every lookup slowly fails.
> By unplugging the network things will fail more quickly and you can
> then have the machine up quickly. Then plug the network cable back in
> and try to debug the network setup.
> You can see (once the machine is up) if the hostname lookup is failing
> by restarting the webserver on an up machine and watching the
> lonnet.log file.
> Alternatively just waiting should also work to bring the machine up,
> but you'll still need to fix the network setup to have a functional
> machine.
> -- 
> guy at albertelli.com   0-7-0-9-27,137
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