[CentOS] Anyway to ensure SSH availability?

[John Hinton]

On 6/30/2011 4:53 PM, Robert Heller wrote:
>
>> Right now it doesn't look like an mail run, more like a httpd run
>> because it's starting to look like a large number of httpd threads was
>> spawned just before that.
> OK, there are probably settings for Apache to run fewer threads.
> Probably better have a "Server too busy" type of message than a wedged
> server.  (And most likely the extra httpd threads will just be spambots
> of some sort anyway -- who cares if they get tossed...)
>
With the launch of Living Social, we have had a few clients use that 
service and you will suddenly have all Apache instances running and the 
server acting very laggy to all but unresponsive. I have cut back on the 
total number of Apache instances due to these 'non-attacks' which are 
much like a DoS attack. It seems the first day is horrid, the second not 
so bad and it wains down from there.

This really raises a new question of what to do the handle such 
broadcast ads? We run very conservative server loads, but...

I don't recommend running it all the time, only when you need to catch 
something, but server status can be your friend. You can run a refresh 
in your browser... leave it running in a tab set to refresh like once 
every minute or five. It will show the instances of Apache and the files 
being accessed. Much faster than digging through logs in a Virt server 
environment. This feature is built into Apache, but is not on by 
default. Look at your httpd.conf file.

-- 
John Hinton
877-777-1407 ext 502
http://www.ew3d.com
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