On 01/05/15 01:43, Tim wrote:
Allegedly, on or about 04 January 2015, Bob Goodwin sent:
>But I could have two crony/NTP servers no? In addition to box10 I
>could make box7 an ntp server and list both in the clients
>configuration file?
Yes, that's actually a good idea. If you already have two PCs
consulting the outside world for time, make them servers on your LAN,
and let your clients use them. That lets your clients get time from
either server, if one of them isn't available for some reason.
A NTP client really should consult several NTP servers (some say at
least four), and those servers should consult more than one server, too
(unless they are*the* master server with an atomic clock, etc). Some
math is done to work out the differences/delays between multiple
servers, to work out which servers are closer up the chain to a master
server, and your own clock's inaccuracies, and your client does its
trick as it sees best based on that information.
Crony/ntp appears to be giving the expected results this morning after
being left to do whatever it does overnight and rebooting the client
again. So I conclude that although I can do systemctl restart chrony
that doesn't initiate an update of the system time correction? Not
knowing how to do that makes it difficult to test ...
[bobg@box10 ~]$ ssh -XC bobg@box48
bobg@box48's password:
Warning: No xauth data; using fake authentication data for X11 forwarding.
Last login: Sun Jan 4 20:36:00 2015 from box10
"fake authentication" What's that about?
[bobg@box48 ~]$ chronyc sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* box10 2 6 377 42 -151us[-1713us]
+/- 321ms
This is the result with only one server, I wanted to see one working
before I confused things with a second unknown. It's interesting to note
that although it is configured to use 192.168.1.10 it correctly
identifies the ntp server as box10 which I assume it gets from /etc/hosts?
I found volumes written on ntp and chrony and the remarkable things it
can do but what I really need is some basic information, primarily how
to cause it to run a new time correction cycle so I can know if a
configuration change has done what I want it to do?
--
http://www.qrz.com/db/W2BOD
box10 Fedora-21/64bit Linux/XFCE
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