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Re: too many open files?

To: Olle.Westman@astrazeneca.com
Subject: Re: too many open files?
From: D.M.Lewney@sussex.ac.uk (Dave Lewney)
Date: Wed, 18 Jun 2003 08:41:03 +0100
Cc: OpenLDAP-software@OpenLDAP.org
References: <9F028CC77827D611ACEE0002A5F12F0702BB4838@semldsntmsx208.seml.astrazeneca.net>
User-agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.1) Gecko/20020827

Olle.Westman@astrazeneca.com wrote:

Hi,

I run openldap-2.1.12 with ldbm backend on IRIX64 6.5.18f. Things have been running flawlessly for a few months now, but recently error messages about connection_read: no connection and "too many open files" on the ldap server host appeared in the log and causing clients to fail reading openldap. A restart of openldap fixes the problem for a few days, but soon returns.

What can be the cause of this? Do I need more file descriptors or is there a
file descriptor leak in openldap ?
We have a little more than 100 clients here. The syslog follows below:

Jun 17 08:52:45 7U:ldap01 last message repeated 5 times
Jun 17 08:52:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 08:53:37 7U:ldap01 last message repeated 5 times
Jun 17 08:53:38 3D:ldap01 timeslave[236]: recvfrom(date read)=-1: No route
to host
Jun 17 08:53:39 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 08:54:45 7U:ldap01 last message repeated 7 times
Jun 17 08:54:47 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 08:56:45 7U:ldap01 last message repeated 8 times
Jun 17 08:56:47 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 08:58:45 7U:ldap01 last message repeated 13 times
Jun 17 08:58:47 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:00:45 7U:ldap01 last message repeated 17 times
Jun 17 09:00:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:01:47 7U:ldap01 last message repeated 8 times
Jun 17 09:01:54 3D:ldap01 timeslave[236]: recvfrom(date read)=-1: No route
to host
Jun 17 09:02:45 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:04:45 7U:ldap01 last message repeated 9 times
Jun 17 09:04:47 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:05:13 7U:ldap01 last message repeated 3 times
Jun 17 09:05:45 3D:ldap01 timeslave[236]: recvfrom(date read)=-1: No route
to host
Jun 17 09:05:45 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:06:45 7U:ldap01 last message repeated 4 times
Jun 17 09:06:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:08:45 7U:ldap01 last message repeated 3 times
Jun 17 09:08:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:09:47 7U:ldap01 last message repeated 8 times
Jun 17 09:09:47 3D:ldap01 timeslave[236]: recvfrom(date read)=-1: No route
to host
Jun 17 09:10:13 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:10:37 7U:ldap01 last message repeated 6 times
Jun 17 09:10:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:11:47 7U:ldap01 last message repeated 3 times
Jun 17 09:12:24 5E:ldap01 login[1135]: root on /dev/ttyd1
Jun 17 09:12:25 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:12:45 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:14:45 7U:ldap01 last message repeated 8 times
Jun 17 09:14:47 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:16:45 7U:ldap01 last message repeated 8 times
Jun 17 09:16:47 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:18:45 7U:ldap01 last message repeated 4 times
Jun 17 09:18:47 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:20:45 7U:ldap01 last message repeated 14 times
Jun 17 09:20:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:21:46 7U:ldap01 last message repeated 3 times
Jun 17 09:22:19 3D:ldap01 timeslave[236]: recvfrom(date read)=-1: No route
to host
Jun 17 09:22:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:24:45 7U:ldap01 last message repeated 8 times
Jun 17 09:24:47 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:24:57 6E:ldap01 sshd[2922244]: Accepted rhosts for adboha from
157.96.192.233 port 886 ruser adboha
Jun 17 09:25:13 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:25:46 7U:ldap01 last message repeated 7 times
Jun 17 09:26:07 3D:ldap01 timeslave[236]: recvfrom(date read)=-1: No route
to host
Jun 17 09:26:45 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:28:45 7U:ldap01 last message repeated 6 times
Jun 17 09:28:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:29:47 7U:ldap01 last message repeated 8 times
Jun 17 09:30:02 3D:ldap01 timeslave[236]: recvfrom(date read)=-1: No route
to host
Jun 17 09:30:13 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:30:36 7U:ldap01 last message repeated 7 times
Jun 17 09:30:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:32:45 7U:ldap01 last message repeated 4 times
Jun 17 09:32:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:34:02 7U:ldap01 last message repeated 6 times
Jun 17 09:34:38 6E:ldap01 sshd[2920427]: Accepted rhosts for root from
157.96.192.233 port 888 ruser root
Jun 17 09:34:45 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:34:45 7U:ldap01 last message repeated 2 times
Jun 17 09:34:46 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:34:49 7U:ldap01 slapd[2831920]: daemon: accept(6) failed errno=24
(Too many open files)
Jun 17 09:35:28 7U:ldap01 slapd[2922286]: slapd starting
Jun 17 09:35:28 5E:ldap01 su[2921936]: succeeded: ttyq4 changing from root
to ldap
Jun 17 10:00:00 7U:ldap01 slapd[2922286]: send_search_entry: ber write
failed
Jun 17 10:19:58 3D:ldap01 timeslave[236]: Time measurements from
timelord.seml.astrazeneca.net are working again
Jun 17 11:54:24 6E:ldap01 sshd[2924164]: Accepted rhosts for root from
157.96.192.248 port 679 ruser root
Jun 17 11:55:59 5E:ldap01 su[2923753]: succeeded: ttyq0 changing from root
to ldap
Jun 17 13:30:54 6E:ldap01 sshd[2925120]: Accepted rhosts for root from
157.96.192.248 port 801 ruser root
Jun 17 14:00:05 7U:ldap01 slapd[2922286]: send_search_entry: ber write
failed
Jun 17 18:03:52 7U:ldap01 slapd[2922286]: connection_read(91): no
connection!
Jun 17 19:05:23 7U:ldap01 slapd[2922286]: connection_read(92): no
connection!
Jun 17 20:03:53 7U:ldap01 slapd[2922286]: connection_read(95): no
connection!
Jun 17 21:05:25 7U:ldap01 slapd[2922286]: connection_read(98): no
connection!
Jun 17 22:03:52 7U:ldap01 slapd[2922286]: connection_read(101): no
connection!
Jun 17 22:05:25 7U:ldap01 slapd[2922286]: connection_read(94): no
connection!
Jun 17 23:03:53 7U:ldap01 slapd[2922286]: connection_read(103): no
connection!
Jun 18 00:03:53 7U:ldap01 slapd[2922286]: connection_read(106): no
connection!
Jun 18 01:03:54 7U:ldap01 slapd[2922286]: connection_read(110): no
connection!
Jun 18 03:00:03 7U:ldap01 slapd[2922286]: send_search_entry: ber write
failed
Jun 18 03:00:06 7U:ldap01 slapd[2922286]: send_search_entry: ber write
failed
Jun 18 03:03:51 7U:ldap01 slapd[2922286]: connection_read(116): no
connection!
Jun 18 03:59:59 7U:ldap01 slapd[2922286]: send_search_entry: ber write
failed
Jun 18 05:00:00 7U:ldap01 slapd[2922286]: send_search_entry: ber write
failed
Jun 18 05:05:26 7U:ldap01 slapd[2922286]: connection_read(115): no
connection!
Jun 18 06:00:07 7U:ldap01 slapd[2922286]: send_search_entry: ber write
failed
Jun 18 06:05:26 7U:ldap01 slapd[2922286]: connection_read(125): no
connection!
Jun 18 07:00:06 7U:ldap01 slapd[2922286]: deferring operation
Jun 18 07:00:06 7U:ldap01 slapd[2922286]: deferring operation
Jun 18 07:03:52 7U:ldap01 slapd[2922286]: connection_read(128): no
connection!
Jun 18 08:03:54 7U:ldap01 slapd[2922286]: connection_read(133): no
connection!
Jun 18 08:54:59 7U:ldap01 slapd[2922286]: slapd shutdown: waiting for 0
threads to terminate
Jun 18 08:54:59 7U:ldap01 slapd[2922286]: slapd stopped.
Jun 18 08:55:01 7U:ldap01 slapd[2939777]: slapd starting
Jun 18 08:59:59 7U:ldap01 slapd[2939777]: send_search_entry: ber write
failed

-Olle Westman

Hi,

Try putting the following line in slapd.conf

idletimeout 20

Since doing this here the problem has not re-occured.

--
Dave
--
Dave Lewney
Principal Systems Programmer, Computing Service
University of Sussex, Brighton BN1 9QJ. Tel: 01273 678354 Fax: 01273 271956

References:
- too many open files?
  - From: Olle.Westman@astrazeneca.com

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