I'm running Squid 3.3 (EPEL) on CentOS 7 and recently I have been getting the following error message in my
WARNING! Your cache is running out of filedescriptors
I am slightly confused by this because I seem to have ample descriptors available:
squidclient mgr:info | grep 'file descri' Maximum number of file descriptors: 16384 Available number of file descriptors: 16326 Reserved number of file descriptors: 100
Squid was also compiled with this flag:
Squid confirms that these are actually available on startup:
2015/08/18 21:11:45 kid1| With 16384 file descriptors available
However this error keeps occurring. Not long after this error is logged the
squid process seems to also hit 100% CPU or use nearly all of the system memory up over 90%, causing the internet speed to drop to a crawl or just hang indefinitely. Killing the process and restarting resolves it but eventually it will happen again.
I have a total of 8 GB of memory available, these are the memory/cache related parameters in my
cache_dir ufs /var/spool/squid 16000 16 256 cache_mem 1024 MB
I am also using
ufdbguard and additional helper plugins for Kerberos and NTLM authentication.