Linux operations, architecture-Intranet NTP time server

First, the environment

[Email protected] tmp]# cat/etc/redhat-6.9-I10.0. 0.61 172.16. 1.61(intranet)

Second, check whether the service software is installed

[Email protected] tmp]# RPM-QA ntpntp-4.2. 6p5-. 2. x86_64

Third, modify the NTP configuration file

vim/etc/ntp.conf# Restrict default kod nomodify notrap nopeer noqueryRestrictdefaultnomodify#  usePublic servers from the     pool.ntp.org project.# Please consider joining the pool (http:   www.pool.ntp.org/join.html). #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 iburst# adds the original unavailable source comment, adding a new time synchronization source server Ntp1.aliyun.comserver time.nist.gov

Iv. Start the NTP service (this server requires an external network)

[Email protected] tmp]#/etc/init.d/ntpd startstarting ntpd:                                             [  OK  ]

Note:

Time is automatically updated after startup

If the original synchronization time task, close, otherwise will be reported as the next error.

Ntpdate[118978]: The NTP socket is on use, exiting

Five, no external network server synchronization time

172.16. 1.61 Ten £ º£ ntpdate[ 21609172.16.  1.610.000652 sec
#时间服务器启动后, it takes a few minutes for the synchronization to take place.
Ntpdate[5687]:for synchronization found    

Six, the synchronous command into the scheduled task

[Email protected] ~]# crontab- -10-10*/5172.16. 1.61  >/dev/null2>&1

Linux operations, architecture-Intranet NTP time server