Re: [hobbit] /etc/resolv.conf and DNS error (http test)

[Dominique Frise <Dominique.Frise (at) unil.ch>]

Hi Dave,

Sorry for the delay, I've been pretty busy those days....
I know that the ARES resolver can be by-passed. I just wanted to point out a 
possible bug in the Hobit code.

Thanks.

Dominique
UNIL - University of Lausanne
Haertig, David F (Dave) wrote:
> Did you try modifying ...../server/etc/hobbitlaunch.cfg?
>
> Change the line:
>
> CMD bbtest-net --report --ping --checkresponse
>
> to:
>
> CMD bbtest-net --report --ping --checkresponse --no-ares
>
> I don't know if you need to restart Hobbit server after this for it to
> take effect.  Wouldn't hurt.
>
> -----Original Message-----
> From: Dominique Frise [mailto:Dominique.Frise (at) unil.ch] 
> Sent: Wednesday, September 26, 2007 9:44 AM
> To: hobbit (at) hswn.dk
> Subject: Re: [hobbit] /etc/resolv.conf and DNS error (http test)
>
>
>
> Haertig, David F (Dave) wrote:
> > Try adding a "search" line to resolv.conf.  e.g., "search
> example.com".
> > Your existing domain line should set this as your default search, but 
> > maybe it's not?  Try explicitly setting it by adding a search line.  
> > But you imply your problem is intermitant, so it's probably not 
> > default search that's getting you.  Do you get the same intermittant 
> > failures when you run "nslookup www.example.com" repeatedly from the 
> > command line?  I believe when you have multiple nameservers listed 
> > they are all queried, and the first to respond wins.  I don't think 
> > Solaris waits for the first to fail before moving on to the second 
> > like you say.  I'm not 100% sure about this though.
> >
> > Note: I believe Solaris only uses the first six entries that are 
> > listed on a resolv.conf "search" line, ignoring the rest.  Something 
> > to keep in mind if you use this.
> >
> > -----Original Message-----
> > From: Dominique Frise [mailto:Dominique.Frise (at) unil.ch]
> > Sent: Wednesday, September 26, 2007 12:43 AM
> > To: hobbit (at) hswn.dk
> > Subject: [hobbit] /etc/resolv.conf and DNS error (http test)
> >
> > Hi,
> >
> > We have tried following settings in the Hobbit server's 
> > /etc/resolv.conf (Solaris 9)
> >
> > domain example.com
> > nameserver 1.2.3.4
> > nameserver 1.2.3.5
> > options timeout:1
> > options retry:1
> >
> >
> > While the first and second nameserver are up and running we receive 
> > sometimes "DNS error" on http checks like http://www.example.com.
> >
> > Assuming that the first nameserver is not responding within the 
> > timeout, the second should be queried by the Hobbit resolver and get 
> > the response.
> >
> > Is there something that we are missing?
> >
> >
> > Dominique
> > UNIL - University of Lausanne
> >
> > To unsubscribe from the hobbit list, send an e-mail to 
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> >
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>
> There are no intermittent problem while using nslookup or any other tool
> relying on the default resolver under Solaris.
> I think the problem comes from the ARES resolver that Hobbit uses
> internally. 
> Maybe the timeouts and retry setting are not interpreted the same way as
> the default resolver does.
> I have no time to look at the code but perhaps Henrik has an answer...
>
> Thanks.
>
> Dominique
>
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