ntpクライアント設定
$ sudo apt-get install chrony
$ sudo gedit /etc/chrony/chrony.conf --- #pool ntp.ubuntu.com iburst maxsources 4 #pool 0.ubuntu.pool.ntp.org iburst maxsources 1 #pool 1.ubuntu.pool.ntp.org iburst maxsources 1 #pool 2.ubuntu.pool.ntp.org iburst maxsources 2 server wpserver iburst ---
$ sudo service chrony restart
$ chronyc sources 210 Number of sources = 1 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^* wpserver 2 6 17 22 +631ns[ +116us] +/- 26ms