Hello,
we're observing the following error message:
"ERR - accept_and_configure - PR_Accept() failed, Netscape Portable Runtime error
-5971 (Process open FD table is full.)"
Looks like the file descriptors are exhausted, probably mainly used by incoming TCP
Connections (based on our investigation regarding open FDs).
We've set (and checked using the runtime information in /proc/PID/limits) the ulimits
and the nsslapd-maxdescriptors to many thousands (while having about 1000 open connection
regularly)
We are investigating in multiple directions here, and have some questions - any input is
appreciated:
1) We acknowledge that exhausted FDs prevent additional connections to be opened. But we
also see, that existing connections are getting unusable, too. Is this a known behaviour?
Can this be avoided?
2) Is there any chance to limit the number of open connections (lower than the max FDs)?
(trying to achieve that existing connections still work)
3) What are best practice to prevent the ldap server from getting completely useless
(until restart) if a client opens many connections?
4) Any additional remarks to prevent this situation?
Kind regards
Tobias Ernstberger
IBM Security
IBM Deutschland GmbH
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