The nomodify notrap statements suggest that your clients are not allowed to configure the server or be used as peers for time sync. If you need additional information for troubleshooting in case there are problems with your NTP daemon add a log file statement which will record all NTP server issues into one dedicated log file. NTP service uses UDP port 123 on OSI transport layer (layer 4).It is designed particularly to resist the effects of variable latency (jitter).
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Assuming you are dual-booting Distro X and Y, first boot into Distribution X.
First check the hardware clock with the following command.
This HOWTO attempts to provide a simple and cross-distribution one-time solution to the issue, making sure all your distributions know that your hardware clock is set to the local time (or UTC if you prefer it).
This is a one-time procedure to ensure that your hardware clock's time zone is correctly and consistently recognized by all the Linux installations you multiboot on a single machine.
Browse through the subdirectories in there and choose the one that represents your region the best and put it in place like I did below: # yum install ntp Loaded plugins: fastestmirror, refresh-packagekit Loading mirror speeds from cached hostfile …================================================================================ Package Arch Version Repository Size ================================================================================ Installing: ntp x86_64 4.2.4p8-3.el6.centos base 444 k Installing for dependencies: ntpdate x86_64 4.2.4p8-3.el6.centos base 58 k Transaction Summary ================================================================================ Install 2 Package(s)Total download size: 502 k Installed size: 1.2 M Is this ok [y/N]: y Downloading Packages: (1/2): ntp-4.2.4p8-3.el6.centos.x86_64| 444 k B (2/2): ntpdate-4.2.4p8-3.el6.centos.x86_64| 58 k B ——————————————————————————————————————— Total 416 k B/s | 502 k B Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : ntpdate-4.2.4p8-3.el6.centos.x86_64 1/2 Installing : ntp-4.2.4p8-3.el6.centos.x86_64 2/2 Unable to connect to dbus Verifying : ntp-4.2.4p8-3.el6.centos.x86_64 1/2 Verifying : ntpdate-4.2.4p8-3.el6.centos.x86_64 2/2Installed: ntp.x86_64 0:4.2.4p8-3.el6.centos Dependency Installed: ntpdate.x86_64 0:4.2.4p8-3.el6.centos Complete!
Now that we have the prerequisites done, we need to choose at least one NTP file to sync with.Network Time Protocol – NTP- is a protocol which runs over port 123 UDP at Transport Layer and allows computers to synchronize time over networks for an accurate time.While time is passing by, computers internal clocks tend to drift which can lead to inconsistent time issues, especially on servers and clients logs files or if you want to replicate servers resources or databases.America/La_Paz America/Lima America/Los_Angeles ... driftfile /var/lib/ntp/drift # Permit time synchronization with our time source, but do not # permit the source to query or modify the service on this system.restrict default nomodify notrap nopeer noquery # Permit all access over the loopback interface.To open this port on RHEL/Cent OS 7 run the following commands against Firewalld service. After NTP daemon has been started, wait a few minutes for the server to synchronize time with its pool list servers, then run the following commands to verify NTP peers synchronization status and your system time. Setting up a local NTP Server on your network ensures that all your servers and clients have the same time set in case of an Internet connectivity failure and they all are synchronized with each other.