[Rack] www.noisebridge wedge, me and SuperQ restarted it

Ben Kochie ben at nerp.net
Tue Sep 11 18:13:33 UTC 2012


Mostly the system was in a swap use death spiral thanks to munin and 
apache.  I purged munin and stopped apache.  That dropped the wap use from 
1.9G to 0.2G.

I shutdown the instance and added a slice to it.  This bumped the ram from 
1G to 2G.  That should help with traffic spikes in the future.

superq at m2:~$ free -m
              total       used       free     shared    buffers     cached
Mem:          2003        850       1153          0         13        196
-/+ buffers/cache:        640       1363
Swap:         2047          0       2047

I'll keep an eye on memory use and see if there is any need to tune 
apache to reduce the memory footprint.

We could also try swapping to apache2-mpm-itk instead of 
apache2-mpm-prefork.  That should reduce the memory footprint and also let 
us tweak the UIDs for the various vhosts.

http://mpm-itk.sesse.net/

-ben

On Tue, 11 Sep 2012, Danny O'Brien wrote:

> It wasn't clear what took it down -- the CPU load was 150 by the time I
> magnaged to get on, and a munin process was taking up 98% of CPU, but
> Apache was also pretty wedged.
>
> I'm not necessarily giving munin the stink-eye here, but after trying to
> shut it down various ways, I ended up apt-get remove'ing it. The
> configuration files will still be there, I didn't apt-get purge, but
> there was no documentation on rack about putting a munin process on www,
> nor did I see anything in the motd.
>
> I feel that it's important to keep www running with a low number of
> critical systems -- essentially www, ssh, the wiki, email, dns,  mailman
> and its own backup systems. It's supposed to stay up all the time, and a
> lot of things break if it doesn't.
>
> Let's walk through what else is running on there now, how it got there,
> whether we need it, and how to maintain it if we do need it. And we
> should restart the MOTD changelog too.
>
> d.
>
>
>
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