Difference between revisions of "Ntp"
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NTP is the network time protocol. It allows you to fetch the current date/time from an internet time server. You can also use it to provide a network time service. | NTP is the network time protocol. It allows you to fetch the current date/time from an internet time server. You can also use it to provide a network time service. | ||
| + | |||
| + | = Synchronize time = | ||
| + | To sync the time with the time server ''pool.ntp.org'' [[find out your distribution]] and use the [[command]] | ||
| + | |||
| + | == for SUSE == | ||
| + | sntp -P no -r ''ntp.company.com'' | ||
| + | |||
| + | == for other distributions == | ||
| + | sntp -s no ''ntp.company.com'' | ||
| + | |||
| + | = Keep time synchronized = | ||
| + | To keep the time synchronized over reboots, | ||
| + | * sync it one time: | ||
| + | sntp -s no pool.ntp.org | ||
| + | * have a file /etc/ntp.conf with one line: | ||
| + | server pool.ntp.org | ||
| + | * start the NTP service: | ||
| + | /etc/init.d/ntp start | ||
| + | * configure the NTP service to start on boot, e.g. for SUSE Linux: | ||
| + | chkconfig ntp on | ||
= Show time offset from time server = | = Show time offset from time server = | ||
| − | # sntp timeserver.mycompany.com | + | # sntp ''timeserver.mycompany.com'' |
| − | + | 2014-02-18 10:09:11.391178 (-0100) '''+6.45592''' +/- 0.000427 secs | |
| + | |||
| + | Means that ''timeserver.mycompany.com'' is 6.5 seconds in the future compared to the local clock. | ||
= Query status = | = Query status = | ||
Latest revision as of 08:56, 8 June 2015
NTP is the network time protocol. It allows you to fetch the current date/time from an internet time server. You can also use it to provide a network time service.
Contents
Synchronize time
To sync the time with the time server pool.ntp.org find out your distribution and use the command
for SUSE
sntp -P no -r ntp.company.com
for other distributions
sntp -s no ntp.company.com
Keep time synchronized
To keep the time synchronized over reboots,
- sync it one time:
sntp -s no pool.ntp.org
- have a file /etc/ntp.conf with one line:
server pool.ntp.org
- start the NTP service:
/etc/init.d/ntp start
- configure the NTP service to start on boot, e.g. for SUSE Linux:
chkconfig ntp on
Show time offset from time server
# sntp timeserver.mycompany.com 2014-02-18 10:09:11.391178 (-0100) +6.45592 +/- 0.000427 secs
Means that timeserver.mycompany.com is 6.5 seconds in the future compared to the local clock.
Query status
# /etc/init.d/ntp status
remote refid st t when poll reach delay offset jitter
==============================================================================
*timehost1.local .PPS. 1 u 356 1024 377 1.404 0.049 0.154
Checking for network time protocol daemon (NTPD): running
Configure it
Edit /etc/ntp.conf, add your time server like this:
server myserver.domain
