Legacy NTP Client Setup

the following is outdated (was the old NTP daemon) – rather enfavor openntpd or chrony

AS A WEEKLY SHOTAS A WEEKLY SHOT

slackware

slackpkg search ntp

ubuntu

apt install ntpdate

shared

first shot sync the hardware clock and then as a weekly cron job

ntp=...

ntpdate $ntp
# -u
hwclock --utc --systohc

AS A DAEMONAS A DAEMON

eventually enable the daemon to keep in sync. note we are keeping the first server lines pointing to local time. we should ideally put at least two servers but we then use peers anyhow.

slackware

slackpkg search ntp
slackpkg search libedit # ntpq

increase the slew range for e.g. pacemaker and dovecot to he happy

cp -pi /etc/rc.d/rc.ntpd /etc/rc.d/rc.ntpd.dist
chmod -x /etc/rc.d/rc.ntpd.dist
chmod +x /etc/rc.d/rc.ntpd
vi /etc/rc.d/rc.ntpd

echo -n "Starting NTP daemon"
/usr/sbin/ntpd -x -g -u ntp:ntp

ls -lF /etc/rc.d/rc.ntpd*
/etc/rc.d/rc.ntpd restart

ubuntu

apt install ntpdate ntp ntpstat

increase the slew range for e.g. pacemaker and dovecot to he happy

cp -pi /etc/default/ntp /etc/default/ntp.dist
vi /etc/default/ntp

NTPD_OPTS='-g -x'

systemctl restart ntp
systemctl status ntp
systemctl enable ntp

ntpstat

note dhclient settings may override those.

#cat /etc/systemd/timesyncd.conf

sharedshared

mv -i /etc/ntp.conf /etc/ntp.conf.dist
grep -vE '^[[:space:]]*(#|$)' /etc/ntp.conf.dist > /etc/ntp.conf.clean
grep -vE '^[[:space:]]*(#|$)' /etc/ntp.conf.dist > /etc/ntp.conf
cat >> /etc/ntp.conf <<EOF

server $ntp iburst

EOF

also see daemons/ntpd if this host is a node member of a cluster farm of some sort.

pgrep -a ntp
ntpq -p
# -n

the jitter should be low, otherwise check the driftfile.

and eventually sync the hardware clock once in a while. that should happen at system’s shutdown anyhow.

hwclock --utc --systohc