Bug 498164

Summary:	bind-9.2.4-22.el3 and too many open files
Product:	Red Hat Enterprise Linux 3	Reporter:	Tomas Smetana <tsmetana>
Component:	bind	Assignee:	Adam Tkac <atkac>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	3.9	CC:	dkovalsk, msusta, ovasik, rvokal, sghosh, tao
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-07-29 18:18:09 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Tomas Smetana 2009-04-29 09:02:53 UTC

Description of problem:
The well-known bug with too many open files is present also in our RHEL-3 bind.

Version-Release number of selected component (if applicable):
bind-9.2.4-22.el3

How reproducible:
Under heavy load

Steps to Reproduce:
1. Start bind
2. Watch the logs
  
Actual results:
The named log contains the following errors:

Apr 09 21:35:31.385 general: error: socket.c:1875: unexpected error:
Apr 09 21:35:31.385 general: error: internal_accept: fcntl() failed: Too many open files

Expected results:
No errors

Additional info:
This is the same problem as in the bug #476515 and bug #457036.  It is qualified as a performance regression caused by an important security fix and there is no known solution for the problem in RHEL-3 and RHEL-4 AFAIK.  We have some patch for RHEL-4 which may help under certain circumstances but I believe this is more question for the product management and engineering whether we would consider fixing this in RHEL-3.

Comment 1 Adam Tkac 2009-04-29 11:45:15 UTC

We can reuse already tested patch from RHEL4 branch (https://bugzilla.redhat.com/show_bug.cgi?id=476515#c15).

I also recommend to set "files 4096;" option in options statement in named.conf.

Comment 13 errata-xmlrpc 2009-07-29 18:18:09 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2009-1181.html