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Install Procedure for ntp-server

Requirements

To install rdesktop you will need the following:
  • a installed and supported operating system (e.g. CentOS 6.x)
  • root-access
  • a fast internet connection

Preliminary Note

This procedure is based on a documentation supplied by

Install

Install ntp:

yum install ntp

Configure ntp Server

vim /etc/ntp.conf

Use external ntp-Server as reference
Basically the ntp.conf is ready configured, so there is nothing to change

If there is need to use additional or different ntp-server then add it to the server section

Use internal clock as reference

This is only necessary if there is no reliable time-source or ntp-server available at all

server 127.127.1.0     # local clock
fudge  127.127.1.0 stratum 4          # set stratum to any value from 0 to 16, the higher the safer, defaults to 10, 4 is working with WinXP and Win7

Start ntp Server

manually start ntp Server:

/etc/init.d/ntpd start

automatically start the service at boot time:

/sbin/service ntpd on

you can check the runlevels by

/sbin/chkconfig --list ntpd

you should get an output like:
ntpd     0:off   1:off   2:off   3:on   4:off   5:on   6:off

configure firewall

Open NTP Port (123) on Iptables Firewall

system-config-firewall-tui

add port 123:udp

check if settings are ok

cat /etc/sysconfig/iptables

You should have following line before COMMIT:
-A RH-Firewall-1-INPUT -m state --state NEW -p udp --dport 123 -j ACCEPT

Restart Iptables Firewall:
/etc/init.d/iptables restart

Usage

try to connect via windows machine and enter as a internet-time-source the ip-adress of the new ntp-server. (e.g. 192.168.2.53)

try to connect via linux machine and use to sync time:

ntpdate 192.168.2.53

Von Jeremias Keihsler vor etwa 7 Jahren aktualisiert · 1 Revisionen