Bug 1219492 – Use iburst option for NTP servers from DHCP

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Bug 1219492 - Use iburst option for NTP servers from DHCP

Summary:	Use iburst option for NTP servers from DHCP

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	chrony (Show other bugs)
Sub Component:
Version:	7.1
Hardware:	Unspecified Unspecified

Priority	unspecified Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	Miroslav Lichvar
QA Contact:	Robin Hack
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2015-05-07 09:28 EDT by Miroslav Lichvar
Modified:	2015-11-19 03:30 EST (History)
CC List:	3 users (show)

See Also:
Fixed In Version:	chrony-2.0-1.el7
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-11-19 03:30:15 EST
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:2241	normal	SHIPPED_LIVE	Moderate: chrony security, bug fix, and enhancement update	2015-11-19 03:59:36 EST

Groups: None (edit)

Description Miroslav Lichvar 2015-05-07 09:28:54 EDT

Description of problem:
NTP servers obtained from DHCP are added by default in chrony's dhclient script without iburst option, which may slow down the initial synchronization unnecessarily. Servers in the default chrony.conf have iburst, so it makes sense to add the servers from DHCP with the option too, unless the NTPSERVERARGS option is set in /etc/sysconfig/network or similar.

Version-Release number of selected component (if applicable):
chrony-1.29.1-1

How reproducible:
always

Steps to Reproduce:
1. connect system to a network where DHCP provides NTP servers
2. check "chronyc -n sources" output and see how quickly the reachability register of the NTP servers from DHCP gets to 17 (four bits in octal)


Actual results:
several minutes

Expected results:
several seconds

Additional info:

Comment 5 errata-xmlrpc 2015-11-19 03:30:15 EST

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-2241.html

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