ntp - BYO-NTP/recipes GitHub Wiki

Install

FreeBSD has included the reference ntp daemon and PPS kernel support since the FreeBSD 3 release in 1998. The installer merely configures it for you.

On Pi OS / Debian, installing ntp from packages will get you ntpsec. To run the canonical ntpd, it must be built from source. The install.sh script does this for you.

curl -sS https://byo-ntp.github.io/tools/ntp/install.sh | sh

source code, and discussion.

Verify

• Use ntpq commands
  • printf '\e[8;9;80t'; ssh -t $NTP_HOST gnu-watch -n2 ntpq -c peer
• After an hour or three, measure the offset. Update the time2 offset.
• Use something like telegraf + influxdb + grafana for statistics.

Disable

Programatically:

curl -sS https://byo-ntp.github.io/tools/ntp/disable.sh | sh

Manually on FreeBSD:

service ntpd stop
sysrc ntpd_enable=NO

Manually on Linux:

systemctl stop ntpd
systemctl disable ntpd

References

• ntp
  • drivers
    • nmea
    • PPS
    • gpsd-ng
    • SHM
  • Configuring NMEA Refclocks NEO-M8T
  • Debugging Reference Clock Drivers
  • Clock Discipline Operations
  • PPS Clock Discipline
  • Pulse-Per-Second (PPS) Signal Interfacing
• NTP Pool Project
• Meinberg Windows port

Upgrade

FreeBSD pkg upgrade

A newer version of ntp may be available as a package. To check:

➜ ntpd --version
ntpd 4.2.8p18-a (1)
➜ pkg search ^ntp-
ntp-4.2.8p18_4                 The Network Time Protocol Distribution

To update/upgrade:

pkg install -y ntp
sysrc ntpd_program=/usr/local/sbin/ntpd

FreeBSD Ports

Perhaps you need to compile ntpd for a special driver:

cd /usr/ports/net/ntp
make install clean

If the ports tree is empty, install instructions are here