Since I run Virtualmin on my Debian 5 machine I have logs full of those messages. Mostly those messages appear on mail.err and on apache2 error log.
I never heard of this error before so it is a bit hard for me to debug it. I tried to list open files with lsof, I could do that yesterday and had about 1300 open files for apache. I tried to do the same some minutes ago got
Almost 150.000 open files from php and apache when apache-status reports the same time:
89.2 requests/sec - 2.2 MB/second - 25.7 kB/request
316 requests currently being processed, 61 idle workers
System is Virtualmin on a Centos 5.5 64bit OS. Nothing else installed, only virtualmin’s repo and nothing else “exotic”.
Sites running using fast cgi with a 240 seconds timeout on apache.
turning it on mod_php it is catastrophic, server load reached 750 (!!!) i couldnt even type on terminal
and I couldnt even shutdown apache… Reboot saved me.
Running
netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n
to check connections per IP and total connections it was fine. Server isn’t under DoS or DDoS attack.
Normal traffic as apache status shows but it raises load without an obvious reason…