kazulog@sv2:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv2:~$ cat /etc/chrony/conf.d/kazulog-ntp.conf
# 社内 NTP サーバー（sv1）を使う
server 192.168.100.10 iburst
kazulog@sv2:~$ chronyc sources -v | tail -3
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* 192.168.100.10                4   6    37     0   +639ns[-1262us] +/- 6986us
kazulog@sv2:~$ chronyc tracking
Reference ID    : C0A8640A (192.168.100.10)
Stratum         : 5
Ref time (UTC)  : Fri Sep 11 07:37:36 2026
System time     : 0.001160111 seconds slow of NTP time
Last offset     : -0.001262207 seconds
RMS offset      : 0.001262207 seconds
Frequency       : 5.342 ppm fast
Residual freq   : -19.058 ppm
Skew            : 4.117 ppm
Root delay      : 0.006275842 seconds
Root dispersion : 0.003924671 seconds
Update interval : 65.3 seconds
Leap status     : Normal
kazulog@sv2:~$ timedatectl | head -6
               Local time: Fri 2026-09-11 16:37:38 JST
           Universal time: Fri 2026-09-11 07:37:38 UTC
                 RTC time: Fri 2026-09-11 07:37:38
                Time zone: Asia/Tokyo (JST, +0900)
System clock synchronized: yes
              NTP service: active