Re: [chrony-users] Control when the driftfile is written

[aobrien@xxxxxxxxxxxxxxx]

Quoting Bill Unruh <unruh@xxxxxxxxxxxxxx>:

> On Thu, 20 Feb 2014, Andrew O'Brien wrote:
>
> > Hello list,
> >
> > I'm interested in running chrony on an embedded device where the  
> > filesystem is normally mounted read only.  My plan was to have a  
> > cron job remount rw and ask chrony to write the driftfile but I  
> > can't seem to figure out that last part.
>
> Well, you could have a small filesystem mounted in ram as a tmpfs, and then
> have a cron job remount the disk/flash based filesystem rw and copy the drift
> file over from the tmpfs filesystem.
>
> >
> --
> William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
> Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
> UBC, Vancouver,BC  |   Program in Cosmology |     unruh@xxxxxxxxxxxxxx
> Canada V6T 1Z1     |      and Gravity       |  www.theory.physics.ubc.ca/

That's a good idea but what I was worried about was that chrony would  
only write the file when it was shutting down.  As the device is  
normally just powered off (hence the ro filesystem) it would never get  
written.

Does anyone know if it writes the file more often than that?

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