NTP Linux Server

In general, the Network Time Protocol (NTP) is a protocol for synchronized to the system time on the computer to the source (server). There are several sites NTP "Stratum 1" (NTP sites with resources from the atomic clock time) and "Stratum 2" (NTP sites with NTP time sources from other sites, with a slightly reduced level of accuracy) that can be used by the public. However I will make how to make ntp local server, so no need for internet access. It's easy:




# Installation #

  The first entry root console, and install the ntp package is needed


# apt-get install ntp ntpdate

     # nano /etc/ntp.conf


edit and add:


# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help


driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.

#statsdir /var/log/ntpstats/


statistics loopstats peerstats clockstats

filegen loopstats file loopstats type day enable

filegen peerstats file peerstats type day enable

filegen clockstats file clockstats type day enable


# You do need to talk to an NTP server or two (or three).

#server ntp.your-provider.example


# pool.ntp.org maps to about 1000 low-stratum NTP servers. Your server will

# pick a different set every time it starts up. Please consider joining the

# pool: <http://www.pool.ntp.org/join.html>

#server 0.debian.pool.ntp.org iburst dynamic

#server 1.debian.pool.ntp.org iburst dynamic

#server 2.debian.pool.ntp.org iburst dynamic

#server 3.debian.pool.ntp.org iburst dynamic

server 127.127.1.0 iburst

fudge 127.127.1.0 stratum 10


# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for

# details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>

# might also be helpful.

#

# Note that "restrict" applies to both servers and clients, so a configuration

# that might be intended to block requests from certain clients could also end

# up blocking replies from your own upstream servers.


# By default, exchange time with everybody, but don't allow configuration.

restrict -4 default kod notrap nomodify nopeer noquery

restrict -6 default kod notrap nomodify nopeer noquery


# Local users may interrogate the ntp server more closely.

restrict 127.0.0.1

restrict ::1


# Clients from this (example!) subnet have unlimited access, but only if

# cryptographically authenticated.

#restrict 192.168.123.0 mask 255.255.255.0 notrust



# If you want to provide time to your local subnet, change the next line.

# (Again, the address is an example only.)

#broadcast 192.168.123.255


# If you want to listen to time broadcasts on your local subnet, de-comment the

# next lines. Please do this only if you trust everybody on the network!

#disable auth

#broadcastclient

Save by typing ctrl + o

After that restart the program by typing

#/etc.init.d/ntp restart


and the last, type :

#ntpq -p (to see the configuration)

> * Image when it is in sync with the local ntp server there is a * in front of LOCAL (0)