How to Install and Configure NTP Server and Client on centos 7/RHEL7

Red Hat Certified System Administrator (RHCSA) exam objectives : Configure a system to use time services using chrony

NTP (Network Time Protocol) is a protocol to keep servers time synchronized: one or several master servers provide time to client servers that can themselves provide time to other client servers.

In this quick tutorial im going to explain how to set an NTP server on centos 7/RHEL 7 using chrony.

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SERVER CONFIGURATION
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# yum install chrony -y
# vi /etc/chrony.conf
-Go to this site and choose your pool zone
http://www.pool.ntp.org/

-Add the following pool zone

server 0.it.pool.ntp.org iburst
server 3.europe.pool.ntp.org iburst
server 2.europe.pool.ntp.org iburst

– Specify a host, subnet, or network from which to allow NTP connections

allow 192.168.1.0/24

# systemctl enable chronyd && systemctl start chronyd

# firewall-cmd –permanent –add-service=ntp
# firewall-cmd –reload

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CLIENT CONFIGURATION
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# yum install chrony -y
# vi /etc/chrony.conf
-Add NTP Server

server ip_of_your_server iburst

# systemctl enable chronyd && systemctl start chronyd

# timedatectl set-ntp true # or timedatectl set-ntp 1

Time synchronization can also be forced with the below chronyc commands

# chronyc -a makestep

# chronyc tracking

source

centos 7