Time synchronization settings for each OS.
RHEL/CentOS The confirmed version is 7.4. Up to 6, it was ntpd, but now chronyd is used.
systemctl status chronyd
If you can't, install YUM
yum install chrony
systemctl enable chronyd
The configuration file is /etc/chrony.conf </ font>. By default, there are the following items, so comment them out.
/etc/chrony.conf
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
So, add the following
/etc/chrony.conf
server [NTP server] iburst
port 0
ʻIburstis an option to make inquiries four times immediately after startup to speed up synchronization.
port0` is an option that" only works as a client ".
systemctl restart chronyd
chronyc sources
If there is a * on the left side of the synchronization destination IP address, it is OK.
timedatectl
NTP enabled: yes
NTP synchronized: yes
Is displayed, it is OK.
Debian/Ubuntu
Confirmed version is 16.04
Systemd-timesyncd is used here.
systemctl -l status systemd-timesyncd
Settings are made in /etc/systemd/timesyncd.conf </ font>.
/etc/systemd/timesyncd.conf
[Time]
NTP=[NTP server]
FallbackNTP=[NTP server]
It is a setting to synchronize to FallbackNTP =
when synchronization with NTP =
is not successful.
systemctl -l status systemd-timesyncd
Status: to
Synchronized to time server [NTP server]
Is displayed, it is OK.
timedatectl
NTP enabled: yes
NTP synchronized: yes
Is displayed, it is OK.
Windows The confirmed version is 2012 R2, which can also be done in 2016.
[Control panel]→[Clock, language, and region]
[Date and time settings]→[Internet time]
Enter the IP address or host name of the destination server in the Server box Click Update Now.
Open a command prompt as an administrator and execute the following command.
w32tm /monitor /computers:[NTP server]
w32tm /query /status /verbose
OK if the settings are reflected in the status. You can also check the last synchronization time and delay. By the way, if you participate in Activce Directory, it will automatically refer to the domain controller.
w32tm /stripchart /computer:[NTP server]
Move the @ on the chart to the middle and wait until it changes to *.
w32tm /resync
Resynchronize with.
w32tm /monitor /computers:[NTP server]
Reconfirmed with.
Of course, the larger the difference between the set time and the synchronization destination time, the longer it will take.
If it is too far away, an error will occur, so
When setting, let's make it as close as possible by manually setting the time.
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