Installing & Configuring NTP on RHEL or CentOS

The script below was used to configure the RHEL or CentOS host to act as an NTP client to the CentOS NTP pool. In summary, the script below does the following:

1. Install ntp
2. Setup the ntp.conf configuration file
3. Enable ntp to startup upon bootup
4. Startup ntp
5. Execute ntpq to verify the box is acting as a ntp client

yum install ntp -y


cp /etc/ntp.conf /etc/ntp.conf.orig

cat > /etc/ntp.conf << EOF

restrict default kod nomodify notrap nopeer noquery

restrict -6 default kod nomodify notrap nopeer noquery

restrict 127.0.0.1

restrict -6 ::1


server 0.centos.pool.ntp.org

server 1.centos.pool.ntp.org

server 2.centos.pool.ntp.org

fudge   127.127.1.0 stratum 10

driftfile /var/lib/ntp/drift

keys /etc/ntp/keys

EOF

chkconfig ntpd on

service ntpd restart

ntpq -p