[Rack] noisebridge.net downtime

Ben Kochie ben at nerp.net
Mon Mar 19 15:47:49 PDT 2012


Cernio is going to be migrating all VMs to new hardware soon.  The 
hardware has been ordered and should be setup in the next few weeks.

This should vastly improve the speed of noisebridge's VPS.  It's also 
going to give us 2GB of ram for less than the price of the 512MB we have 
right now. :)

-ben

On Sun, 18 Mar 2012, Andy Isaacson wrote:

> The VPS hosting the wiki and the mailing lists was unresponsive for a
> few hours yesterday, due to going into swap hell apparently because of a
> lot of active Apache processes running PHP.
>
> A few days back I noticed that Apache was very slow to serve requests,
> and I diagnosed the problem as running out of workers due to "MaxClients
> 20" in apache2.conf.  I increased the setting to 90 and that seemed to
> resolve that episode of slow response times.  Notably, the VPS was not
> at all sluggish during this episode, just Apache was slow to respond due
> to its configuration and how it was interacting with clients.
>
> Last night I noticed that the wiki was slow again, and when I tried to
> log in I found the whole VPS was very slow; a classic swap storm was in
> effect, and I pretty much immediately realized I'd busted this by the
> previous change.  I decreased MaxClients to 40 and restarted apache.
>
> The wiki was unavailable from about 23:15 Saturday until 02:05 Sunday.
>
> Looking at the graphs on status.noisebridge.net (a separate server run
> by Dr Jesus, thanks!), it looks like we had another latency burst
> lasting about an hour around noon today.  This seems to correlate with a
> burst of Apache traffic around the same time and was probably due to the
> same kind of MaxClients limit as the first metioned slowness episode.
>
> I'll continue to keep an eye on the situation.
>
> -andy
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