NTP

 NTP server is mainly use for time synchronization.

Area of NTP:-

                        1) crontab

                        2) backup script

                        3) remote based

                        4) Kerberos

                        5) CA

                        6) Time based all policy

In a one organization we can create maximum 3 NTP server.

For Example.

                       1) Stratum-10  1^st server

                       2) Stratum-15 2^nd Server

                       3) Stratum-16 3^rd Server It on peer based

Service Profile

                  System V-managed service

                  Package             = ntp

                  Daemon             = ntpd

                  Configuration file = /etc/ntp.conf

                  Port number       = 123 (UDP)

                  Log file               = /var/log/message 

Configuration 

                  # vim /etc/ntp.conf

Uncomment here

                  Server 127.0.0.1

                  Fudge 127.0.0.0 stratum 10

After that save the file and restart service 

                  # service ntpd restart

On clients

                  # system-config-date

and make configuration here add the IP of server after that restart the service 

                  # service ntpd restart

On CLI based

   Option 1:-

                  # ntpdate –b ip of ntp server

Option 2:-

                  # vim /etc/ntp.conf

insert here

                 Server ip of server (Ex. Server 172.17.1.1)

Monitering of NTP

                  #ntpq

                  Ntpq> host ip of ntp server (Ex host 172.17.1.1)

                  Ntpq> peers

                  #ntpq –p