[ntp:questions] Sure GPS - Very High Jitter and Offset

unruh unruh at wormhole.physics.ubc.ca
Fri Aug 19 18:58:15 UTC 2011


On 2011-08-14, Ken Link <klink at numberzero.org> wrote:
> Following up on my previous posts...
>
> I compiled NTP 4.2.6p3 on my Ubuntu server (with the NMEA refclock
> enabled, debugging enabled and linuxcaps enabled) but I'm getting
> Permission Denied when it tries to access /dev/gps0 (symlink to
> /dev/ttyS0). I saw from searching that someone fixed it by disabling
> SELinux, but I don't have it installed.
>
> Command line: /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u ntp:ntp -d
> ..."refclock_open /dev/gps0: Permission denied"...
>
> # ls -al /dev/ttyS0
> crw-rw---- 1 ntp ntp 4, 64 2011-08-13 19:20 /dev/ttyS0

So try making it rw for all and see if that helps.

>
> # ls -al /dev/gps0
> lrwxrwxrwx 1 root root 5 2011-08-13 19:06 /dev/gps0 -> ttyS0
>
> Any ideas?




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