[CentOS] Time delaying (or time lagging)

happymaster23 happymaster23 at gmail.com
Sun Sep 7 22:18:39 UTC 2008


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)
>
>
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