From 36781b572b421cbf75051e0faa40ffb48988ecec Mon Sep 17 00:00:00 2001 From: "Eric S. Raymond" Date: Sat, 10 Sep 2016 19:30:05 -0400 Subject: Recommend NTPsec in the Time Service HOWTO. --- www/gpsd-time-service-howto.txt | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) (limited to 'www') diff --git a/www/gpsd-time-service-howto.txt b/www/gpsd-time-service-howto.txt index a541a7c2..558ea69f 100644 --- a/www/gpsd-time-service-howto.txt +++ b/www/gpsd-time-service-howto.txt @@ -2,7 +2,7 @@ :description: How to set up an NTP Stratum 1 server using GPSD. :keywords: time, GPSD, NTP, time, precision, 1PPS, PPS, stratum, jitter Gary E. Miller , Eric S. Raymond -v2.9, Aug 2016 +v2.10, Sep 2016 This document is mastered in asciidoc format. If you are reading it in HTML, you can find the original at the GPSD project website. @@ -366,12 +366,12 @@ You will need to have either ntpd or chrony installed. If you are running a Unix variant with a package system, the packages will probably be named 'ntp' (or 'ntpsec') and either 'chrony' or 'chronyd'. -Of these two, ntpd is the older and more popular choice - thus, the -one with the best-established peer community if you need help in -unusual situations. On the other hand, chrony has a reputation for -being easier to set up and configure, and is better in situations -where your machine has to be disconnected from the Internet for long -enough periods of time for the clock to drift significantly. +Between ntp and chrony, ntp is the older and more popular choice - +thus, the one with the best-established peer community if you need +help in unusual situations. On the other hand, chrony has a +reputation for being easier to set up and configure, and is better in +situations where your machine has to be disconnected from the Internet +for long enough periods of time for the clock to drift significantly. ntpd and chrony have differing philosophies, with ntpd more interested in deriving consensus time from multiple sources while chrony tries to @@ -383,6 +383,12 @@ is <>. If you don't already know enough about time service to have a preference, the functional differences between them are unlikely to be significant to you; flip a coin. +If you choose ntpd, it's best to go with the NTPsec version rather +than legacy ntpd. (As of September 2016 NTPsec is not yet generally +available in binary package form. You will have to build it from +source.) NTPsec shares some maintainers with GPSD, and has some +significant improvements in security and performance. + == Choice of Hardware == To get 1PPS to your NTP daemon, you first need to get it from a @@ -1856,5 +1862,6 @@ by Jaap Winius . 2.10 September 2016 Mention ntpviz Recommend minpoll=maxpoll=0 for PPS refclocks + Recommend NTPsec. // end -- cgit v1.2.1