Bug 661939

Summary: dhcp primary server keeps outputing "lease imbalance" messages
Product: Red Hat Enterprise Linux 5 Reporter: Masahiro Matsuya <mmatsuya>
Component: dhcpAssignee: Jiri Popelka <jpopelka>
Status: CLOSED ERRATA QA Contact: Release Test Team <release-test-team-automation>
Severity: high Docs Contact:
Priority: medium    
Version: 5.7CC: atodorov, fdewaley, ovasik, rvokal, tcapek
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: dhcp-3.0.5-27.el5 Doc Type: Bug Fix
Doc Text:
Previously, when the dhcpd service was used in a failover configuration, the primary server sometimes wrote so many "lease imbalance" messages into its log files, that it resulted in a termination. With this update, these messages are not logged unless rebalance is attempted, and the bug no longed occurs.
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Clone Of: Environment:
Last Closed: 2011-07-21 10:58:56 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:
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Description Flags
backported patch none

Description Masahiro Matsuya 2010-12-10 02:52:10 UTC 
Created attachment 467897 [details]
backported patch

Description of problem:
A customer are using dhcpd in a failover configuration and the primary server cannot handle any requests by a message flood. The primary server shows lots of "lease imbalance" messages in the logs and dies without core file or any syslog messages.

The problem is described in <http://marc.info/?l=dhcp-users&m=118851702131444&w=2> (for version 3.06 of dhcpd) and seems to be fixed in version 3.1. See http://marc.info/?l=dhcp-users&m=118893179113440&w=2 and http://www.isc.org/files/release-notes/31esv.html 

The issue was solved with version 3.0.7 : 
  http://dhcp.me/archives/1-ISC-DHCP-3.0.7-has-been-released!.html 

I backported this and the customer tested it. As a result, they confirmed this problem was fixed. I'll attach the backported patch.

Version-Release number of selected component (if applicable):
dhcp-3_0_5-23.el5

How reproducible:
Always

Steps to Reproduce:
At this time, no responsible method to reproduce it.
  
Actual results:
primary server outputs a large amount of messages and cannot provide the services.

Expected results:
primary server doesn't output a large amount of messages and keeps providing the services fine.
Comment 1 Jiri Popelka 2010-12-10 14:25:03 UTC 
Thank you, Masahiro !
Comment 11 Tomas Capek 2011-05-31 08:18:08 UTC 
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Previously, when the dhcpd service was used in a failover configuration, the primary server sometimes wrote so many "lease imbalance" messages into its log files, that it resulted in a termination. With this update, these messages are not logged unless rebalance is attempted, and the bug no longed occurs.
Comment 13 errata-xmlrpc 2011-07-21 10:58:56 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/RHBA-2011-1038.html