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Jeremias Keihsler, 17.04.2024 10:13
Install Procedure for ntp-server¶
Requirements¶
To install ntpd you will need the following:- a installed and supported operating system (e.g. CentOS 9.x)
- root-access
- a fast internet connection
Preliminary Note¶
This procedure is based on a documentation supplied by- http://www.cyberciti.biz/faq/rhel-fedora-centos-configure-ntp-client-server/
- http://http://www.gtkdb.de/index_7_576.html
- http://linuxwave.blogspot.com/2007/08/setting-up-your-own-ntp-server.html
Install¶
Install ntp:
yum install ntpsec
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
server 10.13.109.241 iburst
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
restrict access from outside¶
restrict default nomodify noquery
# enable all access for localhost
restrict 127.0.0.1
restrict ::1
# enable access from subnet
restrict 10.13.109.1/24 nomodify
restrict 10.13.108.0/24
Start ntp Server¶
manually start ntp Server:
systemctl start ntpd
automatically start the service at boot time:
systemctl enable ntpd
you can check by
systemctl is-enabled ntpd
configure firewall¶
When you are not running the CentOS Firewall yet, then start it:
systemctl enable firewalld
systemctl start firewalld
add chronyd to the firewall if you are going to serve ntp
firewall-cmd --add-service=ntp --permanent
firewall-cmd --reload
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
ntpq -p
Von Jeremias Keihsler vor 8 Monaten aktualisiert · 2 Revisionen