Configure NTP Client and Server

This should work for RHEL/CentOS/Fedora.

On the local NTP Server:
1) install ntp
2) start service
3) add to chkconfig
4) edit /etc/ntp.conf and configure as local NTP server
5) restart service
6) check synchronization
7) only if needed: open port 123 on firewall

On the local NTP Client:
1) install ntp
2) start service
3) add to chkconfig
4) edit /etc/ntp.conf and configure as local NTP client
5) restart service
6) check synchronization
7) only if needed: open port 123 on firewall

# install ntp and related packages
yum install ntp

# start ntpd service
service ntpd start

# enable ntpd to start on boot
chkconfig ntpd on

# restart ntpd service
service ntpd restart

# check peers
ntpq -p

# check synchronization
ntpstat

Local NTP server configuration:

### DEFAULT settings
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

### CHANGE TO: Local NTP server settings
# Hosts on local network are less restricted.
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

Local NTP client configuration:

### DEFAULT settings
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server 0.centos.pool.ntp.org iburst
server 1.centos.pool.ntp.org iburst
server 2.centos.pool.ntp.org iburst
server 3.centos.pool.ntp.org iburst

### CHANGE TO: Local NTP client settings
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
server 192.168.1.2 iburst
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