Red Hat has moved the Network Time Protocol implementation from ntp package to chrony(*)
The system’s timezone is set during the install process, but it can be easily changed at a later time.
timedatectl is the command to set time and date. An example on how to set and check the timezone for Mount Time Zone or America/Denver (MDT)
timedatectl list-timezones | grep Denver
America/Denver
timedatectl set-timezone America/Denver
date
Wed Apr 1 21:59:23 MDT 2020
Chrony is available from the official repositories
dnf install chrony
Edit the configuration file:
vim /etc/chrony.conf
and add the following lines the with the ntp servers, for example:
pool time.facebook.com iburst
pool time.google.com iburst
pool time.apple.com iburst
enable chronyc daemon:
systemctl enable --now chronyd
systemctl status chronyd
chronyc sources
210 Number of sources = 10
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^- time3.facebook.com 1 7 377 296 -32ms[ -32ms] +/- 143ms
^? time1.facebook.com 0 6 0 - +0ns[ +0ns] +/- 0ns
^* time4.google.com 1 10 377 966 +3724us[+4473us] +/- 36ms
^+ time3.google.com 1 10 377 122 +21ms[ +21ms] +/- 53ms
^+ time2.google.com 1 10 377 897 -2047us[-2047us] +/- 31ms
^+ time1.google.com 1 10 377 333 -15ms[ -15ms] +/- 49ms
^- usscz2-ntp-002.aaplimg.c> 1 10 317 1023 -8067us[-7321us] +/- 97ms
^- ussjc2-ntp-001.aaplimg.c> 1 8 377 169 -27ms[ -27ms] +/- 269ms
^- uslax1-ntp-002.aaplimg.c> 1 9 337 303 +2965us[+2965us] +/- 44ms
^- uslax1-ntp-001.aaplimg.c> 1 9 217 300 +460us[ +460us] +/- 32ms
chronyc sourcestats
210 Number of sources = 10
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
time3.facebook.com 19 11 26m +1.513 55.555 -9021us 19ms
time1.facebook.com 0 0 0 +0.000 2000.000 +0ns 4000ms
time4.google.com 32 15 87m -0.118 1.161 -538us 2143us
time3.google.com 32 16 101m +1.012 2.371 +5747us 3057us
time2.google.com 31 17 88m -0.443 1.110 -2334us 2292us
time1.google.com 31 15 97m +0.557 1.928 -1115us 2708us
17.253.16.253 28 13 100m +14.229 15.377 +72ms 29ms
ussjc2-ntp-001.aaplimg.c> 12 5 62m +16.399 32.402 -2280us 25ms
uslax1-ntp-002.aaplimg.c> 22 11 47m +8.945 31.209 +6443us 32ms
uslax1-ntp-001.aaplimg.c> 26 14 63m +7.318 21.143 +497us 29ms
[root@centos8-01 ~]# chronyc tracking
Reference ID : D8EF230C (time4.google.com)
Stratum : 2
Ref time (UTC) : Thu Apr 02 04:25:47 2020
System time : 0.000462417 seconds fast of NTP time
Last offset : +0.000749799 seconds
RMS offset : 0.002851715 seconds
Frequency : 509.233 ppm slow
Residual freq : +0.016 ppm
Skew : 0.828 ppm
Root delay : 0.058634870 seconds
Root dispersion : 0.004686652 seconds
Update interval : 1038.9 seconds
Leap status : Normal