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Configuration of NTP Server on CentOS 8

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This document provides instructions for configuring a CentOS 8 system as an NTP server or client using the Chrony NTP daemon. It describes installing the Chrony package, enabling it to start on boot, configuring it as a server to serve local networks by modifying /etc/chrony.conf, restarting Chrony, and opening firewall ports. It also provides instructions for configuring a system as a Chrony client by pointing it to the local NTP server.

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1 CONFIGURATION OF NTP SERVER ON CENTOS 8 Chrony is a default NTP client as well as an NTP server on RHEL 8 / CentOS 8. This article will provide you with an information on how to perform an installation and basic configuration of an NTP server or client on RHEL 8.  Install package Chrony NTP:  dnf install chrony  Enable chrony to start after boot:  systemctl enable chronyd  Set Chrony to act as an NTP server for a local network. As already mentioned before the Chrony NTP daemon can act as both, NTP server or as NTP client. To turn Chrony into an NTP server add the following line into the main Chrony  /etc/chrony.conf configuration file: allow 10.30.30.0/24 ; allow 192.168.70.0/24
2  Restart Chrony NTP daemon to apply the changes:  systemctl restart chronyd  Open firewall port to allow for incoming NTP requests: 1) Firewalld  firewall-cmd –zone=privatekaan --add-service=ntp --permanent  firewall-cmd –reload  firewall-cmd –runtime-to-permanent  firewall-cmd –zone=privatekaan --list-all We have configured and see ntp service in our Firewalld. Now let’s do it via “IPTables” which we are using actively.
3 2) IPTables  iptables -A INPUT -s 10.30.30.254 -d 10.30.30.5 -p udp --dport ntp -j ACCEPT  iptables-save > /etc/sysconfig/iptables  iptables -L  To turn Chrony into the NTP cleint add the following line into the main Chrony /etc/chrony.conf configuration file. Change the IP address accordingly to point to your local Chrony NTP server:  Server 10.30.30.5
4  Restart Chrony NTP daemon to apply the changes:  systemctl restart chronyd  Check for NTP server sources. Your local NTP server should be listed:  chronyc sources  Check NTP client list on the NTP server:  chronyc clients 1/16/2022 X Kaan Aslandag Signed by: www.kaan1.com

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Configuration of NTP Server on CentOS 8

  • 1. 1 CONFIGURATION OF NTP SERVER ON CENTOS 8 Chrony is a default NTP client as well as an NTP server on RHEL 8 / CentOS 8. This article will provide you with an information on how to perform an installation and basic configuration of an NTP server or client on RHEL 8.  Install package Chrony NTP:  dnf install chrony  Enable chrony to start after boot:  systemctl enable chronyd  Set Chrony to act as an NTP server for a local network. As already mentioned before the Chrony NTP daemon can act as both, NTP server or as NTP client. To turn Chrony into an NTP server add the following line into the main Chrony  /etc/chrony.conf configuration file: allow 10.30.30.0/24 ; allow 192.168.70.0/24
  • 2. 2  Restart Chrony NTP daemon to apply the changes:  systemctl restart chronyd  Open firewall port to allow for incoming NTP requests: 1) Firewalld  firewall-cmd –zone=privatekaan --add-service=ntp --permanent  firewall-cmd –reload  firewall-cmd –runtime-to-permanent  firewall-cmd –zone=privatekaan --list-all We have configured and see ntp service in our Firewalld. Now let’s do it via “IPTables” which we are using actively.
  • 3. 3 2) IPTables  iptables -A INPUT -s 10.30.30.254 -d 10.30.30.5 -p udp --dport ntp -j ACCEPT  iptables-save > /etc/sysconfig/iptables  iptables -L  To turn Chrony into the NTP cleint add the following line into the main Chrony /etc/chrony.conf configuration file. Change the IP address accordingly to point to your local Chrony NTP server:  Server 10.30.30.5
  • 4. 4  Restart Chrony NTP daemon to apply the changes:  systemctl restart chronyd  Check for NTP server sources. Your local NTP server should be listed:  chronyc sources  Check NTP client list on the NTP server:  chronyc clients 1/16/2022 X Kaan Aslandag Signed by: www.kaan1.com