Abstract

This page describes how to configure, use and troubleshoot ntpd. The ntp package includes ntpd (a daemon which continuously adjusts system time) and utilities used to query and configure the ntpd daemon. It's an implementation of the Network Time Protocol (NTP) used to synchronize a computer's
time with another reference time source.

Applies to:

• ntp
• Red Hat Enterprise Linux (RHEL)

Official Documentation

Installation

• Checking if the ntp daemon is installed

Configuration

• Understanding the ntpd configuration file
• Understanding the ntpd sysconfig file
• Disabling chrony
• ntpd configuration application from Labs

Troubleshooting Guides

• How to troubleshoot NTP issues
  
• Why NTP servers are rejected in RHEL?

KCS Resources

• Best practices for NTP
  
• How to enable NTP statistics
• ntpd panic_stop +3702 s; set clock manually within 1000 s
• Red Hat Enterprise Linux server using NTP will not keep time in sync with Windows-synced NTP server / windows NTP server
• Can NTP be used with two NTP servers, specifying one as primary and another as backup?
• How To Configure Authenticated NTP Using Symmetric Keys (compatibility with FIPS 140-2)
  

Virtual Machines

• Managing the time on virtual machines

Virtual machines - KVM

• KVM guest timing management

Virtual machines - VMware

• Erratic time issues on VMware based RHEL guests running ntpd
  

Virtual machines - Hyper-V

• Time synchronization for Hyper-V virtual machines