Updating linux time
Later on anytime a new interface comes up it retries to update the time - while doing so it will try to slowly drift time as long as the delta it has to cover isn't too big.
That behaviour can be controlled with the By default the systemd based tools request time information at ntp.
These strategies control how that reboot occurs: strategy mandates that each machine acquire and hold a reboot lock before it is allowed to reboot.
The main goal behind this strategy is to allow for an update to be applied to a cluster quickly, without losing the quorum membership in etcd or rapidly reducing capacity for the services running on the cluster.
timedatectl status Local time: Fri 2016-04-29 UTC Universal time: Fri 2016-04-29 UTC RTC time: Fri 2016-04-29 Time zone: Etc/UTC (UTC, 0000) Network time on: yes NTP synchronized: no RTC in local TZ: no and thereby no more installed by default.
If installed it will run once at boot time to set up your time according to Ubuntu's NTP server.
The reboot lock is held until the machine releases it after a successful update.
The number of machines allowed to reboot simultaneously is configurable via a command line utility: strategy works exactly like it sounds: the machine is rebooted as soon as the update has been installed to the passive partition.
We believe that automatically updating the operating system is one of the best tools to achieve this goal.This is an overkill for the typical home user, so I would like to avoid it.There is no reason to run your own NTP server on your home PC or laptop.It does not have the ability to store the time standard (localtime or UTC), nor whether DST is used. the software clock) keeps track of: time, time zone, and DST if applicable.It is calculated by the Linux kernel as the number of seconds since midnight January 1st 1970, UTC.
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The initial value of the system clock is calculated from the hardware clock, dependent on the contents of .