CentOS7 時計あわせ関連

CentOS7的にデフォルトはchrony。ntpdも使えますがどちらかのみ。

ntpdを殺して、chronyを使う場合

# systemctl stop ntpd.service
# systemctl disable ntpd.service
# systemctl start chronyd.service
# systemctl enable chronyd.service
# chronyc sources
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* 192.168.248.224               2   6   377    33    -29us[  -68us] +/-   16ms

 

 

ntpdの場合

# systemctl stop  chronyd.service
# systemctl disable  chronyd.service
# systemctl start  ntpd.service
# systemctl enable  ntpd.service

chronydを殺す。設定は略(ぁ

# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*ntp-b3.nict.go. .NICT.           1 u   26   64  377   23.085   -0.216  21.137

*おまけ chronyの設定
# cat /etc/chrony.conf
server ntp.nict.jp iburst
driftfile /var/lib/chrony/drift
makestep 3.0 3
rtcsync
allow 192.168.0.0/16
allow 172.16.0.0/12
allow 10.0.0.0/9
port 123
cmdport 0
acquisitionport 123
logdir /var/log/chrony