Oracle Linux 7.0 ve sonraki versiyonlardaki ntpd yerine kullanılan chrony , varsayılan ayarlarla çalıştırıldığında Windows NTP sunucularından zaman senkronizasyonu yapmamaktadır.
Kontrol yapıldığında aşağıdaki gibi “Not synchronised” şeklinde görülmektedir.
[root@linux ~]# chronyc tracking
Reference ID : 00000000 ()
Stratum : 0
Ref time (UTC) : Thu Jan 01 00:00:00 1970
System time : 0.000000000 seconds fast of NTP time
Last offset : +0.000000000 seconds
RMS offset : 0.000000000 seconds
Frequency : 0.000 ppm slow
Residual freq : +0.000 ppm
Skew : 0.000 ppm
Root delay : 1.000000000 seconds
Root dispersion : 1.000000000 seconds
Update interval : 0.0 seconds
Leap status : Not synchronised
Sorunun çözümü için /etc/chrony.conf konfigürasyon dosyasına “maxdistance 16.0” satırı eklenip servisler yeniden başlatılmalıdır. Örnek konfigürasyon dosyası aşağıdaki gibi olabilir.
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#pool 2.pool.ntp.org iburst
server 192.168.10.4 iburst
server 192.168.10.5 iburst
# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift
# Allow the system clock to be stepped in the first three updates
# if its offset is larger than 1 second.
makestep 1.0 3
# Enable kernel synchronization of the real-time clock (RTC).
rtcsync
# Enable hardware timestamping on all interfaces that support it.
#hwtimestamp *
# Increase the minimum number of selectable sources required to adjust
# the system clock.
#minsources 2
# Allow NTP client access from local network.
#allow 10.10.212.0/24
# Serve time even if not synchronized to a time source.
#local stratum 10
# Specify file containing keys for NTP authentication.
keyfile /etc/chrony.keys
# Get TAI-UTC offset and leap seconds from the system tz database.
leapsectz right/UTC
# Specify directory for log files.
logdir /var/log/chrony
# Select which information is logged.
#log measurements statistics tracking
maxdistance 16.0
Gerekli değişiklik sonrasında chronyd servisini aşağıdaki gibi yeniden başlatın.
[root@linux~]# systemctl stop chronyd
[root@linux~]# systemctl start chronyd
Tekrar kontrol edildiğinde sorunsuz şekilde senkron hale getirecektir.
[root@linux~]# chronyc tracking
Reference ID : 0A6AD404 (DC01.interiva.local)
Stratum : 2
Ref time (UTC) : Tue Jun 28 12:45:57 2022
System time : 0.000000523 seconds fast of NTP time
Last offset : +0.000000527 seconds
RMS offset : 0.000000527 seconds
Frequency : 1.094 ppm fast
Residual freq : +0.013 ppm
Skew : 76.336 ppm
Root delay : 0.000752150 seconds
Root dispersion : 10.952806473 seconds
Update interval : 2.0 seconds
Leap status : Normal
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