Re: {bb} bbnet Unknown host

[Philip Clark <bblist@cannae.uklinux.net>]

On Wed, 2007-07-11 at 14:49 -0600, bb@buglecreek.com wrote:
> 
> Thanks Phil, I will give that a try.  Looking at this a little more, it
> is
> interesting that I experience no name resolution problems for the
> connectivity tests.  Ping has to resolve the name in order to perform
> the connectivity test, but it seems that the http and conn tests  may
> use different system calls to get it done.  We have servers with a
> green connectivity status for over 200 days, but the same server when
> testing http will randomly experience the problem above.  I  may not
> fully understand how bb does all it's testing, but it seems that if it
> were purely a DNS issue it would show up during the ping tests also? 
> Just a thought.
> 

>From memory (and a very brief scan of the code), I think that they do
things a little differently. The standard BB "conn" test will call
ping with the IP that you specify in bb-hosts, unless you have
"0.0.0.0" for that machine. The normal "http" test will use the
local resolver on the BBNET machine to try and get the IP for the
URL that you specify in bb-hosts.

I imagine that this is to allow for cases where you might have a
single web-server dealing out pages for a number of back-end
applications, like so:

10.0.0.10 web.mynet.com # http://web.mynet.com/index.html
10.0.0.20 app1.mynet.com # http://web.mynet.com/app1/index.html
10.0.0.30 app2.mynet.com # http://web.mynet.com/app2/index.html

In this way, if web application goes down, it is reported against
the application server and is not tied to the front-end. But this
is just a guess.

Cheers, Phil.



--
The only problem with being a man of leisure is that you can never
stop and take a rest.


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