[CentOS] Time delaying (or time lagging)

happymaster23 happymaster23 at gmail.com
Sun Sep 7 22:27:49 UTC 2008


...and sorry, I have forgot to include printout from ntptrace, so:

localhost.localdomain: stratum 2, offset 0.000029, synch distance 0.949418
tak.cesnet.cz: stratum 1, offset 0.000000, synch distance 0.002272, refid
'GPS'

2008/9/8 happymaster23 <happymaster23 at gmail.com>

> Thank you very much,
>
> all is working perfectly. I am using ntp.nic.cz (CZ NIC is cz TLD
> registry), tak.cesnet.cz (CESNET is czech academic network) and
> 1.cz.pool.ntp.org. I think, that this servers are good? Am I right? Or is
> better to use more NTP servers?
>
> Thanks
>
> 2008/9/6 John R Pierce <pierce at hogranch.com>
>
> happymaster23 wrote:
>>
>>> Hello everyone,
>>>
>>> I have problem with time delaying on my CentOS powered server. I have
>>> tried to set time in BIOS and in OS (with saving time to BIOS), but time
>>> still delaying, so after month is about five minutes delayed. In past I was
>>> using this box with Windows and there wasn´t this time problem, but I cant
>>> warrant, that there are no hardware issues. So I was decided, that easiest
>>> way to fix this problem will be setting up the NTP. I have found many
>>> howtos, but I don´t believe them. So my question is: How to clearly set NTP
>>> in CentOS 5?
>>>
>>
>>
>>   # yum install ntp
>>
>> then, edit /etc/ntp.conf, and at a minimum specify some ntp servers and
>> restrict access to localhost...
>>
>>   restrict 127.0.0.1
>>   restrict -6 ::1
>>
>>   # Use public servers from the pool.ntp.org project.
>>   # Please consider joining the pool (http://www.pool.ntp.org/join.html).
>>   server ntp1.sf-bay.org
>>   server ntp2.sf-bay.org
>>   server reloj.kjsl.com
>>   server ntp1.mainecoon.com
>>   server ntp2.mainecoon.com
>>   server time.berkeley.netdot.net
>>
>>
>>
>> (note, those are the LOCAL TO ME ntp servers that *I* am using, you should
>> undoubtedly use others as appropriate, or use the pool servers... see
>> http://ntp.isc.org/bin/view/Servers/WebHome for guidelines)...
>>
>> finally...
>>
>>   # chkconfig ntpd on
>>   # service ntpd start
>>
>> and wait about 20 mins for it to sync up, and verify functionality with
>> ntptrace...
>>
>>   # ntptrace
>>   localhost.localdomain: stratum 3, offset 0.004351, synch distance
>> 0.088396
>>   zorro.sf-bay.org: stratum 2, offset 0.000543, synch distance 0.044773
>>   clock.via.net: stratum 1, offset 0.000027, synch distance 0.000446,
>> refid 'GPS'
>>
>> if your systems clock is particularlly funky, it may be a good idea to
>> edit, /etc/sysconfig/ntpd  and set SYNC_HWCLOCK=yes rather than no.
>> (this tells it to set your HW CMOS clock when it sets the system clock
>> during the initial synchronization)
>>
>>
>> _______________________________________________
>> CentOS mailing list
>> CentOS at centos.org
>> http://lists.centos.org/mailman/listinfo/centos
>>
>
>
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