Sep 21, 2012
The Linux kernel keeps track of the system clock by counting timer interrupts. Read clock. To check the current system clock time (presented both in local time and UTC) as well as the RTC (hardware clock): $ timedatectl Set system clock. To set the local time of the system clock directly: # timedatectl set-time "yyyy-MM-dd hh:mm:ss" For example: Nov 06, 2011 · This is RHEL 6.1 with ntp-4.2.4p8-2.el6.x86_64 on an IBM x3550 M3. The ntp config is the default config plus additional local ntp servers. The log file reports "kernel time sync status 2040" - Which translates to NANO and UNSYNC. Windows Time follows the NTP specification, which requires the use of UDP port 123 for all time synchronization communication. This port is reserved by Windows Time and remains reserved at all times. Whenever the computer synchronizes its clock or provides time to another computer, that communication is performed on UDP port 123. A time source represents the source from which this chassis will synchronize its OS kernel time. The following source types are supported: An external NTP server; An external PTP server; An internal SpectraTime GPS module (an optional hardware add-on for the chassis)
Aug 02, 2018
Hi, There was some logs in /var/log/messages: kernel time sync enabled 4001 kernel time sync enabled 0001 I didn't find anything related these messages. What does mean the message? The Red Hat Customer Portal delivers the knowledge, expertise, and guidance available through your Red Hat subscription.
Sep 21, 2012
By default, Container Linux machines keep time in the Coordinated Universal Time (UTC) zone and synchronize their clocks with the Network Time Protocol (NTP). This page contains information about customizing those defaults, explains the change in NTP client daemons in recent Container Linux versions, and offers advice on best practices for Oct 16 11:19:43 esx2 ntpd\[2602]: kernel time discipline status change 41. Oct 16 11:19:48 esx2 ntpd\[2602]: kernel time discipline status change 1 and after about 10 minutes have not yet recieved the lost sync notification. Does anyone know what the status change messages indicate? 13 Feb 07:17:28 ntpd[22483]: kernel time sync status change 2501 13 Feb 07:18:32 ntpd[22483]: kernel time sync status change 2301 13 Feb 07:19:38 ntpd[22483]: kernel time sync status change 2901 13 Feb 07:20:41 ntpd[22483]: kernel time sync status change 2301 13 Feb 07:21:47 ntpd[22483]: kernel time sync status change 2101 ntpdate forces the system clock to the current time but ntp never syncs up with a time server so it starts to drift. If system time runs to fast or slow ntp can not compensate. The suggested utility should update the kernel time variables and stabilise the system clock. The Amazon Time Sync Service automatically smooths any leap seconds that are added to UTC. The Amazon Time Sync Service is available through NTP at the 169.254.169.123 IP address for any instance running in a VPC. Your instance does not require access to the internet, and you do not have to configure your security group rules or your network The Linux kernel is a multitasking kernel, which means that many processes can run as if they were the only process on the system. The way in which an operating system chooses which process at a given time has access to a system’s CPU(s) is controlled by a scheduler.