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NTP (Network Time Protocol) : RPM - Qa - Grep NTP ntp.x.x.x.x86 - 64 Ntpdate.x.x.x86 - 64

NTP (Network Time Protocol) is used to synchronize computer clock times over the Internet. NTP servers run software that provides the accurate time of day from atomic clocks to client computers using UDP port 123. NTP supports a hierarchy of servers to handle high client loads and includes algorithms to adjust for network transmission delays. Operating systems like Windows, Mac OS X and Linux can configure clients to synchronize with NTP servers through their control panels and the ntpd service.

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Juli Lopera Cepeda
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185 views1 page

NTP (Network Time Protocol) : RPM - Qa - Grep NTP ntp.x.x.x.x86 - 64 Ntpdate.x.x.x86 - 64

NTP (Network Time Protocol) is used to synchronize computer clock times over the Internet. NTP servers run software that provides the accurate time of day from atomic clocks to client computers using UDP port 123. NTP supports a hierarchy of servers to handle high client loads and includes algorithms to adjust for network transmission delays. Operating systems like Windows, Mac OS X and Linux can configure clients to synchronize with NTP servers through their control panels and the ntpd service.

Uploaded by

Juli Lopera Cepeda
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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NTP (Network Time Protocol)

The NTP system is based on Internet time servers, computers with access to atomic clocks such as those operated
by the U.S. government. These NTP servers run a software service that provides the clock's time of day to client
computers over UDP port 123. NTP supports a hierarchy of multiple server levels to handle a large load of
client requests. The protocol includes algorithms to accurately adjust the time of day being reported to account
for Internet network transmission delays.

Computers running Windows, Mac OS X and Linux operating systems can be configured to use an NTP server.
Starting with Windows XP, for example, the Control Panel "Date and Time" option contains an Internet Time
tab which allows choosing an NTP server and turning time synchronization on or off

The process name of the service = ntpd


Name of the rpm = ntpd

 First check to see if you OS has already service rpm package installed on the system
rpm -qa | grep ntp
ntp.x.x.x.x86_64
ntpdate.x.x.x86_64

 If the above rpms exist then you can proceed with the configuration
 If the rpms do not exist then download the package/rpm using yum command
yum install ntpd -y

 Once the package is installed make changes to the following configuration file:
/etc/ntp.conf (Linux)

Add NTP server IP or hostname where server parameters are defined


server ntp-hostname

 Now start the service


systemctl restart ntpd

 Also in order to have the service startup at the boot time run the following command
systemctl enable ntpd

 NTP Logs location


/var/log/messages

 Commands
ps -ef | grep ntp
OR
ntpq  peers  quit
ntpdate = Set date and time via ntp
ntpdate –v hostname = To manually force the time to sync with ntp server
 List of NTP Servers on Web:
http://www.pool.ntp.org/zone/north-america

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