Holding Time With Amazon Time Sync Carrier | Amazon Web Services

Nowadays we’re launching Amazon Time Sync Carrier, a time synchronization service delivered over Community Time Protocol (NTP) which makes use of a snappy of redundant satellite-connected and atomic clocks in every map to raise a highly graceful reference clock. This service is equipped at no additional charge and is straight away available in all public AWS regions to all cases working in a VPC.

That that it’s doubtless you’ll per chance per chance assemble admission to the service by blueprint of the link local 169.254.169.123 IP tackle. This implies you don’t want to configure exterior cyber web assemble admission to and the service would possibly per chance per chance per chance even be securely accessed from internal your private subnets.

Setup

Chrony is a special implementation of NTP than what ntpd makes use of and it’s in a position to synchronize the system clock faster and with greater accuracy than ntpd. I’d recommend the use of Chrony unless you’ve gotten a legacy reason to utilize ntpd.

Inserting in and configuring chrony on Amazon Linux is as uncomplicated as:

sudo sudo yum erase ntp*
sudo yum -y install chrony
sudo service chronyd start

Alternatively, honest modify your present NTP config by adding the line server 169.254.169.123 buy iburst.

On Windows you would possibly per chance per chance per chance poke the following instructions in PowerShell or a inform instructed:

gain quit w32time
w32tm /config /syncfromflags:manual /manualpeerlist:"169.254.169.123"
w32tm /config /reputable:yess
gain start w32time

Jump Seconds

Time is laborious. Science, and society, measure time with respect to the World Celestial Reference Frame (ICRF), which is computed the use of long baseline interferometry of distant quasars, GPS satellite orbits, and laser ranging of the moon (cool!). Irregularities in Earth’s charge of rotation region off UTC to waft from time with respect to the ICRF. To tackle this clock waft the World Earth Rotation and Reference Programs (IERS) as soon as rapidly introduce an extra 2d into UTC to withhold it internal Zero.9 seconds of accurate time.

Jump seconds are acknowledged to region off application errors and this will likely be a enviornment for many savvy developers and systems directors. The 169.254.169.123 clock smooths out leap seconds some period of time (continuously known as leap smearing) which makes it uncomplicated to your applications to tackle leap seconds.

This smartly timed replace must present immediate advantages to someone previously counting on an exterior time synchronization service.

– Randall