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Date: Tue, 27 Sep 2005 07:39:25 -0400
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From: PMilanese@nypl.org
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Subject: RE: [users@httpd] [httpd 1.3] 100% CPU utilization

> Hello,
> 
> I have a very unusual problem running httpd 1.3.27 on Solaris 2.8.  The 
> daemon is forking and consuming 80-95% of the CPU and meanwhile requests

> are just hanging.  Nothing seems to be making it into the logs.  We're 
> totally perplexed about this one.  Unfortunately these production 
> systems can't be upgraded to 2.0 due to 3rd party plugins that do not 
> support Apache httpd 2.0.

If it is only one process, it is likely some code or the stated 3rd party
process. What is it that you are running, and does it use a database?
Also, check your logs to see if a bunch of requests precede the outage.
Restart Apache, and see if there is it gradually starts to consume
resources. There are many things that you need to consider before assuming
that you are DoS'd. A very popular cause could be that the 3rd party thing
cannot keep up with the connections that apache is feeding it. Thus apache
connections are held in wait. This would explain CPU due to the wait, and
no response because apache runs out of connections.

Good luck.

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