How to sync NTP time with chrony
chrony is a network time protocol (NTP) implementation. It can be used to keep server time sync with NTP servers.
To install chrony on RHEL based OS, run
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yum install chrony |
On Debian/Ubuntu, run
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apt install chrony |
Configure chrony
On Ubuntu, by default chrony is configured to use ubuntu NTP servers.
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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 |
If you need to change NTP servers, you can edit configuration file
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vi /etc/chrony/chrony.conf |
Restart chrony
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systemctl restart chrony |
Enable chrony
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systemctl enable chrony |
Start chrony
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systemctl start chrony |
To view status, run
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systemctl status chrony |
Display system time information, you can use the command “chronyc tracking”.
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root@ip-172-26-14-120:~# chronyc tracking Reference ID : E9485C92 (prod-ntp-4.ntp4.ps5.canonical.com) Stratum : 3 Ref time (UTC) : Sat Jun 10 08:15:27 2023 System time : 0.000015639 seconds slow of NTP time Last offset : -0.000025658 seconds RMS offset : 0.000170312 seconds Frequency : 4.834 ppm fast Residual freq : -0.007 ppm Skew : 0.255 ppm Root delay : 0.008501955 seconds Root dispersion : 0.001060591 seconds Update interval : 260.2 seconds Leap status : Normal root@ip-172-26-14-120:~# |
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