network time protocol HowTo - Linux / Unix Q & A from nixCraft

CentOS / Redhat Linux: Install OpenNTPD To Synchronize The Local Clock

last updated November 22, 2016 in CentOS, Fedora Linux, Linux, Package Management, RedHat and Friends

OpenNTPD is a Unix system daemon implementing the Network Time Protocol to synchronize the local clock of a computer system with remote NTP servers. How do I install OpenNTPD under CentOS / RHEL / Fedora Linux instead of default NTPD client / server?

How to verify NTP is working Or not (Check Status of NTP)

last updated September 30, 2019 in Linux, Networking, UNIX

I‘ve setup an NTP (Network Time Protocol) client and/or server to manage the system clock over a network. But, how do I verify that it is working correctly?

FreeBSD Install OpenNTPD NTP Server / Client To Synchronize The Local Clock

last updated November 23, 2016 in FreeBSD, Hardware, IPv6, Networking, OpenBSD, Package Management, PF Firewall, Security, UNIX

How do I install OpenNTPD ( a Unix system daemon implementing the Network Time Protocol) to synchronize the local clock of a FreeBSD computer system with remote NTP servers called ntp.myisp.com?

CentOS / Red Hat Configure an NTP Client And Server

last updated June 24, 2010 in CentOS, Fedora Linux, Hardware, Iptables, Linux, Networking, Package Management, RedHat and Friends

How do I configure an NTP (Network Time Protocol) client or server under CentOS / RHEL / Fedora Linux to manage the system clock over a network?

BIND: Clocks are Unsynchronized Error and Solution

last updated February 1, 2009 in Bind dns, CentOS, Debian / Ubuntu, FreeBSD, HP-UX Unix, Linux, Networking, OpenBSD, Package Management, RedHat and Friends, Solaris-Unix, Suse, Troubleshooting, Ubuntu Linux, UNIX

Q. I’ve configured BIND named TSIG as documented here. It worked for some time, but my /var/log/messages got the errors as follows:

zone example.org/IN: refresh: failure trying master 71.22.11.22#53 (source 0.0.0.0#0): clocks are unsynchronized: 9 Time(s)
zone example.org/IN: refresh: failure trying master 71.22.11.22#53 (source 71.22.11.22#0): clocks are unsynchronized: 9 Time(s)

How do I fix these errors under Debian Linux 64 bit etch server?

Debian / Ubuntu Linux Install NTPD To Synchronism Clock With Internet Standard Time Servers

last updated August 30, 2008 in Debian / Ubuntu, Linux, Networking, Package Management

Q. How do I install and configure NTP ( Network Time Protocol ) daemon to keep my dedicated servers clock in sync?

HP-UX UNIX Configure an NTP Server

last updated January 15, 2008 in HP-UX Unix, Networking, UNIX

Q. How do I configure an NTP (network time protocol) Server under HP-UX UNIX server as my applications rely on the system clock accuracy to get current time / run reports?
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