This is an old revision of the document!
ntp
I remember looking at this circa 2016 - 2021 and letting go at that time, crony had just been released and systemd was still relatively new at that time.
systemd commands
- sudo systemctl status systemd-timesyncd
- The default configuration is shown in
/etc/systemd/timesyncd.conf(All the defaults are shown commented out) - Copy the default configuration in
/etc/systemd/timesyncd.confto/etc/systemd/timesyncd.conf.d/timesyncd.confand modify options in/etc/systemd/timesyncd.conf.d/timesyncd.conf
- timedatectl timesync-status
ntp servers
ntp servers can be checked using the ntpdate command, which can be loaded in Debian with sudo apt install ntpsec-ntpdate
Ranked by testing with sudo ntpdate -q {ntp servername/ip}
| sync | accuracy | server | ip address | stratum | leap status |
|---|---|---|---|---|---|
| +0.018040 | +/- 0.026068 | nets.org.sg | 129.126.239.115 | s1 | no-leap |
| +0.020117 | +/- 0.027653 | server 3.au.pool.ntp.org | 103.126.53.123 | s2 | no-leap |
| +0.020819 | +/- 0.027315 | 0.au.pool.ntp.org | — Karl-Peter Baum 2025-11-09 Sun wk45 11:21 | s2 | no-leap |
| +0.050351 | +/- 0.064718 | 1.au.pool.ntp.org | 180.150.8.191 | s1 | no-leap |
| +2.023585 | +/- 2.027176 | 2.au.pool.ntp.org | 110.232.114.22 | s2 | no-leap |
Taken 2025-11-09 09:40
| sync | accuracy | server | ip address | stratum | leap status |
|---|---|---|---|---|---|
| +0.002717 | +/- 0.027207 | 3.debian.pool.ntp.org | 139.99.135.247 | s2 | no-leap |
| +0.003344 | +/- 0.030205 | 0.debian.pool.ntp.org | 150.107.75.115 | s2 | no-leap |
| +0.187739 | +/- 0.208642 | 1.debian.pool.ntp.org | 203.132.94.154 | s1 | no-leap |
| +2.001419 | +/- 2.038669 | 2.debian.pool.ntp.org | 159.196.3.239 | s2 | no-leap |
| +0.000044 | +/- 0.024017 | pool.ntp.org | 129.250.35.250 | s2 | no-leap |
| +0.000092 | +/- 0.024373 | au.pool.ntp.org | 112.213.32.219 | s2 | no-leap |
| +0.023537 | +/- 0.064874 | 0.au.pool.ntp.org | 159.196.3.239 | s2 | no-leap |
| +0.000697 | +/- 0.021170 | 1.au.pool.ntp.org | 67.219.100.202 | s2 | no-leap |
| +2.002964 | +/- 2.027214 | 2.au.pool.ntp.org | 112.213.32.219 | s2 | no-leap |
| +0.154351 | +/- 0.184338 | 3.au.pool.ntp.org | 159.196.40.161 | s1 | no-leap |