How to Configure NTP Server Locally (Without Internet Access)

How to Configure NTP Server Locally Without Internet Access

Step by Step how to Configure NTP Server

Step1: Mount your CD and Install following RPM if alread not installed

rpm -ivh ntp-4.2.6p5-25.0.1.el7.x86_64.rpm
rpm -ivh ntpdate-4.2.6p5-25.0.1.el7.x86_64.rpm


Step2: edit /etc/ntp.conf file and locate the below entry and uncomment it. Also modify ip address and mask according to your network

restrict 192.9.1.0 mask 255.255.255.0 nomodify notrap


Step3: Comment out the default ntp servers listed in /etc/ntp.conf. In my case it is

#server 0.rhel.pool.ntp.org iburst
#server 1.rhel.pool.ntp.org iburst
#server 2.rhel.pool.ntp.org iburst
#server 3.rhel.pool.ntp.org iburst

Step4:  Locate below entry and comment out if it is there in /etc/ntp.conf

#restrict ::1

Step5: dd the entry of your ntp server in /etc/ntp.conf

server dns.oracle.com prefer

Note : Do not forget to add additinal these 2 Entries. These are required to access its own system clock, also called the local clock.

server 127.127.1.0
fudge 127.127.1.0 stratum 10

Step6: Disable iptables

service iptables stop
service ip6tables stop
chkconfig  iptables off
chkconfig ip6tables off

Step7:  Start ntp Service


systemctl start  ntpd.service
systemctl enable ntpd.service
ntpq -p

Step by Step How to Configure NTP Client.

Step1: Mount your CD and Install following RPM if alread not installed

rpm -ivh ntp-4.2.6p5-25.0.1.el7.x86_64.rpm
rpm -ivh ntpdate-4.2.6p5-25.0.1.el7.x86_64.rpm

Step2: Edit /etc/ntp.conf and add below entry


server 192.9.1.102 (this is your NTP Server)


Step3: Start ntp Service on your client too


systemctl start  ntpd.service
systemctl enable ntpd.service

step4: Synchronize your local time with the server


# ntpdate -u 192.9.1.102
15 Jun 11:12:17 ntpdate[5225]: adjust time server 192.9.1.102 offset 0.000615 sec

ntpq -p


Thats all. You are done