Difference between revisions of "NTP: Server Time Sync"
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(New page: To sync time on server , you need ntpdate utility. On Centos: yum install ntp On debian: apt-get install ntpdate So we can sync time with public NTP server: ntpdate pool.ntp.org Mak...) |
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=Installing NTP client= | |||
To sync time on server , you need ntpdate utility. | To sync time on server , you need ntpdate utility. | ||
| Line 14: | Line 16: | ||
Make periodically sync time: | Make periodically sync time: | ||
touch /var/log/ntpdate.log | |||
touch /var/log/ntpdate.log<br> | |||
crontab -e | crontab -e | ||
and insert: | and insert: | ||
04 0,8,16 * * * root ntpdate pool.ntp.org >>/var/log/ntpdate.log | 04 0,8,16 * * * root ntpdate pool.ntp.org >>/var/log/ntpdate.log | ||
<Press ENTER> | <Press ENTER> | ||
| Line 23: | Line 27: | ||
And save. | And save. | ||
That's all | That's all | ||
---- | |||
NOTE: Special script installs all this when MOR is installed. | |||
=Troubleshooting= | |||
Please ensure that both TCP and UDP protocols have port 123 opened. | |||
Try to run ntpdate in debug mode: | |||
ntpdate -d pool.ntp.org | |||
In normal case output should be: | |||
[root@node01 ~]# ntpdate -d pool.ntp.org | |||
18 Mar 14:16:40 ntpdate[30259]: ntpdate 4.2.2p1@1.1570-o Sat Dec 19 00:58:17 UTC 2009 (1) | |||
Looking for host pool.ntp.org and service ntp | |||
host found : ns2.telecom.lt | |||
transmit(212.59.0.2) | |||
receive(212.59.0.2) | |||
transmit(212.59.0.2) | |||
receive(212.59.0.2) | |||
transmit(212.59.0.2) | |||
receive(212.59.0.2) | |||
transmit(212.59.0.2) | |||
receive(212.59.0.2) | |||
transmit(212.59.0.2) | |||
transmit(88.222.88.11) | |||
receive(88.222.88.11) | |||
transmit(88.222.88.11) | |||
receive(88.222.88.11) | |||
transmit(88.222.88.11) | |||
receive(88.222.88.11) | |||
transmit(88.222.88.11) | |||
receive(88.222.88.11) | |||
transmit(88.222.88.11) | |||
server 212.59.0.2, port 123 | |||
stratum 4, precision -20, leap 00, trust 000 | |||
refid [212.59.0.2], delay 0.02950, dispersion 0.00000 | |||
transmitted 4, in filter 4 | |||
reference time: d1330728.fc987987 Tue, Mar 22 2011 13:31:52.986 | |||
originate timestamp: d1330c2e.7f1e006f Tue, Mar 22 2011 13:53:18.496 | |||
transmit timestamp: d12dcba9.135147f1 Fri, Mar 18 2011 14:16:41.075 | |||
filter delay: 0.03065 0.02950 0.03056 0.03056 | |||
0.00000 0.00000 0.00000 0.00000 | |||
filter offset: 344197.4 344197.4 344197.4 344197.4 | |||
0.000000 0.000000 0.000000 0.000000 | |||
delay 0.02950, dispersion 0.00000 | |||
offset 344197.417828 | |||
server 88.222.88.11, port 123 | |||
stratum 2, precision -20, leap 00, trust 000 | |||
refid [88.222.88.11], delay 0.03140, dispersion 0.00000 | |||
transmitted 4, in filter 4 | |||
reference time: d13307fd.89b3ce29 Tue, Mar 22 2011 13:35:25.537 | |||
originate timestamp: d1330c2e.c91d6139 Tue, Mar 22 2011 13:53:18.785 | |||
transmit timestamp: d12dcba9.4e73e681 Fri, Mar 18 2011 14:16:41.306 | |||
filter delay: 0.04402 0.03140 0.03856 0.04202 | |||
0.00000 0.00000 0.00000 0.00000 | |||
filter offset: 344197.4 344197.4 344197.4 344197.4 | |||
0.000000 0.000000 0.000000 0.000000 | |||
delay 0.03140, dispersion 0.00000 | |||
offset 344197.462460 | |||
18 Mar 14:16:41 ntpdate[30259]: step time server 88.222.88.11 offset 344197.462460 sec | |||
Latest revision as of 11:56, 22 March 2011
Installing NTP client
To sync time on server , you need ntpdate utility.
On Centos: yum install ntp
On debian: apt-get install ntpdate
So we can sync time with public NTP server:
ntpdate pool.ntp.org
Make periodically sync time:
touch /var/log/ntpdate.log
crontab -e
and insert:
04 0,8,16 * * * root ntpdate pool.ntp.org >>/var/log/ntpdate.log <Press ENTER>
And save. That's all
NOTE: Special script installs all this when MOR is installed.
Troubleshooting
Please ensure that both TCP and UDP protocols have port 123 opened.
Try to run ntpdate in debug mode:
ntpdate -d pool.ntp.org
In normal case output should be:
[root@node01 ~]# ntpdate -d pool.ntp.org
18 Mar 14:16:40 ntpdate[30259]: ntpdate 4.2.2p1@1.1570-o Sat Dec 19 00:58:17 UTC 2009 (1)
Looking for host pool.ntp.org and service ntp
host found : ns2.telecom.lt
transmit(212.59.0.2)
receive(212.59.0.2)
transmit(212.59.0.2)
receive(212.59.0.2)
transmit(212.59.0.2)
receive(212.59.0.2)
transmit(212.59.0.2)
receive(212.59.0.2)
transmit(212.59.0.2)
transmit(88.222.88.11)
receive(88.222.88.11)
transmit(88.222.88.11)
receive(88.222.88.11)
transmit(88.222.88.11)
receive(88.222.88.11)
transmit(88.222.88.11)
receive(88.222.88.11)
transmit(88.222.88.11)
server 212.59.0.2, port 123
stratum 4, precision -20, leap 00, trust 000
refid [212.59.0.2], delay 0.02950, dispersion 0.00000
transmitted 4, in filter 4
reference time: d1330728.fc987987 Tue, Mar 22 2011 13:31:52.986
originate timestamp: d1330c2e.7f1e006f Tue, Mar 22 2011 13:53:18.496
transmit timestamp: d12dcba9.135147f1 Fri, Mar 18 2011 14:16:41.075
filter delay: 0.03065 0.02950 0.03056 0.03056
0.00000 0.00000 0.00000 0.00000
filter offset: 344197.4 344197.4 344197.4 344197.4
0.000000 0.000000 0.000000 0.000000
delay 0.02950, dispersion 0.00000
offset 344197.417828
server 88.222.88.11, port 123
stratum 2, precision -20, leap 00, trust 000
refid [88.222.88.11], delay 0.03140, dispersion 0.00000
transmitted 4, in filter 4
reference time: d13307fd.89b3ce29 Tue, Mar 22 2011 13:35:25.537
originate timestamp: d1330c2e.c91d6139 Tue, Mar 22 2011 13:53:18.785
transmit timestamp: d12dcba9.4e73e681 Fri, Mar 18 2011 14:16:41.306
filter delay: 0.04402 0.03140 0.03856 0.04202
0.00000 0.00000 0.00000 0.00000
filter offset: 344197.4 344197.4 344197.4 344197.4
0.000000 0.000000 0.000000 0.000000
delay 0.03140, dispersion 0.00000
offset 344197.462460
18 Mar 14:16:41 ntpdate[30259]: step time server 88.222.88.11 offset 344197.462460 sec
