NTP time synchronization

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(i). NTP service end-to-end configuration

1. NTP Server Installation

[[email protected] ~]# rpm-qa ntpntp-4.2.6p5-5.el6.centos.x86_64[[email protected] ~]# install [[email protected] ~]# Yum -Y Install NTP

2 Modify the NTP configuration file and save the exit

[Email protected] ~]# vim/etc/ntp.conf #restrict default kod nomodify notrap nopeer noquery#restrict-6 default Kod nomo Dify notrap nopeer noquery restrict default nomodify #nomodify客户端可以同步 #server 0.centos.pool.ntp.org iburst#server 1.centos.pool.ntp.org iburst#server 2.centos.pool.ntp.org iburst#server 3.centos.pool.ntp.org iburstserver Ntp1.aliyun.com # Default time synchronization source changed to Ali and another server time.nist.gov

3. Local scheduled Task If there is a timed task with synchronization time, note time synchronization of timed tasks

[[email protected] ~]# crontab-l #set by Sanlang to get consistent TIME#*/5 * * * */usr/sbin/ntpdate time.nist.gov> /dev/null 2>&1[[email protected] ~]#

4: Start the NTP server

[[email protected] ~]#/etc/init.d/ntpd start[[email protected] ~]# ntpstatsynchronised to NTP Server (182.92.12.11) at S Tratum 3 time correct to within 7946 MS polling server every s[[email protected] ~]#

(b). NTP Client configuration (there will be some delay for the first time)

[[email protected] ~]# ntpdate 10.0.0.6122 may 23:14:48 ntpdate[11916]: Step time server 10.0.0.61 offset 12727.969441 sec [[email protected] ~]# echo "* * * */usr/sbin/ntpdate 10.0.0.61" >>/var/spool/cron/root client writes this command to the scheduled task, it is best to write the comments first

Rethinking: 1. Scheduled tasks can be distributed with a dispenser

2.NTP server-side time will be a single point of failure, so at least two units

3. The client does the timing task to see the demand, how long time synchronizes once

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NTP time synchronization