Re: [chrony-users] How to fail over to Internet when local server is not available

[Patrick Goebel <patrick@xxxxxxxxxxx>]

I tried using the latest version from source and it does indeed start 
without going offline when the laptop is not on.  Even better, it starts 
syncing with the laptop when the laptop is turned on. However, for some 
odd reason the desktop does not sync with the other servers in the 
chrony.conf file when the laptop is off. Instead, 'chronyc tracking' 
always produces output similar to:

Reference ID    : 127.127.1.1 ()
Stratum         : 10
Ref time (UTC)  : Sun Jun 19 15:40:35 2016
System time     : 0.000000000 seconds slow of NTP time
Last offset     : +0.000000000 seconds
RMS offset      : 0.000000000 seconds
Frequency       : 5.446 ppm slow
Residual freq   : +0.000 ppm
Skew            : 0.000 ppm
Root delay      : 0.000000 seconds
Root dispersion : 0.000001 seconds
Update interval : 0.0 seconds
Leap status     : Normal

where the Reference ID is always 127.127.1.1 ()

The relevant part of the chrony.conf file is still:

server 0.debian.pool.ntp.org offline minpoll 8
server 1.debian.pool.ntp.org offline minpoll 8
server 2.debian.pool.ntp.org offline minpoll 8
server 3.debian.pool.ntp.org offline minpoll 8

server pi-robot-netbook.local prefer iburst minpoll 5

--patrick

On 06/14/2016 11:33 PM, Miroslav Lichvar wrote:
> On Tue, Jun 14, 2016 at 06:01:24AM -0700, Patrick Goebel wrote:
> > Hi Miroslav,
> >
> > Thanks for your reply.  I tried removing the offline option from each server
> > but that did not solve the problem.  I finally figured out that the issue
> > appears to be related to using the Zeroconf hostname for the laptop
> > (pi-robot-netbook.local).  If I use the IP address for the netbook or the
> > DNS hostname of a different host that I know is not an NTP server, the
> > problem goes away.
> >
> > Using the Zeroconf hostname for the laptop is important so maybe I'll have
> > to live with occasionally manually restarting chrony on the desktop unless
> > there is some other way to have chrony recognize a Zeroconf hostname.
> So the problem is that the IP address of the laptap changed and chrony
> didn't try to resolve the name again and had to be restarted? I think
> that would work with a more recent chrony version, which try to
> replace sources automatically.

--
The Pi Robot Project
http://www.pirobot.org/wordpress



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