...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@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@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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