Le 2012-09-06 19:14, Marco Fioretti a écrit :
Greetings, I run my own email server for some domains I administer, on a centos vps server with a very small number of users.
The only services are smtp, imap/pop, webmail
however, there is something that is using "much more memory than normal" (see the comment below from the hosting sysadmin after he checked user_beancounters). Initially we thought it was apache, but even switching it off didn't change anything. What now?
My 2 cents. You probably checked a lot of things.
- a filesystem (almost) full ? - did you check the logs ? any errors ? - a user sending/receiving a large e-mail ? what is the maximum size of an e-mail in your MTA settings ? - more mail-services-related processes ? - did you try to stop mail services to see if the server usability is back ? - do you run antispam and/or antivirus on incoming/outgoing e-mails ?
- to help with DNS, you can probably enable nscd or setup dnsmasq, so it would reduce DNS queries sent to DNS servers.