On Fri, 6 Jul 2007 16:30:32 -0400 "Tony Rice \(trice\)" <trice@xxxxxxxxx> wrote: > Any suggestions on configuration changes I can make to lessen the > impact of CGI scripts which become CPU hogs? > I'm running an apache server with about 150 virtual servers. > Ocassionally an errant script will go nuts and consume 100% of the > CPU. It's really bad when a spider finds one of these poorly written > scripts and calls it a few thousand times. Two suggestions: (1) Use ulimit to limit what a CGI script can have. (2) Use mod_load_average (google for where it is) to refuse to run the bad scripts, or refuse to run any script, when the server is busy (as measured by system load average). If you can identify bad spiders reliably, e.g. by IP address or User-Agent, you can block specifically that. There's a mod_rewrite recipe for that, or there's mod_robots, which I hacked up quickly to deal with a particular robot that was causing a similar problem. > Any other suggestions? Can consistent > connections be throttled on a per client IP address basis? Can > server processes be controlled on a per virtual server basis? Take a look at modules.apache.org for bandwidth-limiting modules. But they really solve a different problem. -- Nick Kew Application Development with Apache - the Apache Modules Book http://www.apachetutor.org/ --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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