[hobbit] resolver failures

[Daniel J McDonald]

On Wed, 2006-11-29 at 13:51 +0100, Henrik Stoerner wrote:
> On Wed, Nov 29, 2006 at 06:40:58AM -0600, Daniel J McDonald wrote:
> > I am seeing intermittent resolver failures
> > in /var/log/hobbit/bb-network.log.
> > 
[...]
> > Or is there some
> > local resolver caching I could set up to help mitigate this problem?
> 
> A local caching DNS server on the Hobbit box doing network tests is always 
> a good idea.

A new instance of bind seems to have resolved the issue.

> > At any other point in the MRTG polling cycle the resolver seems to work
> > fine.  The other pieces cause the system to be network bound during the
> > initial poll (about 25 seconds), and disk bound (40 seconds) whilst
> > re-writing the ~6000 RRD files.
> 
> So another solution might be to make sure that the MRTG update and the
> Hobbit network tests do not run at the same time. You can do that if you
> run the mrtg update from hobbitlaunch instead of through cron; the GROUP
> keyword for each section in hobbitlaunch.cfg is used to make sure there
> is only one task belonging to each GROUP running at the same time.

This would not likely work.  The total time that MRTG runs is about 3
minutes 40 seconds, with a fair chunk of that single-threaded (and thus
not CPU bound on my multi-processor box).  To limit bb-net tests to just
that small timeslice eliminates some the the cool benefits of hobbit,
like 1-minute retries...

-- 
Daniel J McDonald, CCIE # 2495, CISSP # 78281, CNX
Austin Energy
http://www.austinenergy.com