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This video is based on RHEL 8.

Video to cover the section 'Configure time service clients' for the RHCSA (Red Hat Certified System Administrator).

More information on the required learning: http://bit.ly/rhcsa8

Notes from the video:

To show the current date and time:

date

To use date to print out the current date and time in a particular format you can use the date variable for example:

date +%d%m%y-%H%M%S

This can be used in a script to produce a new log file name everytime the script is run for example:

touch logfile-`date +%d%m%y-%H%M%S`.log

Will output a log file with the current date and time.

To get the current hardware clock time:

hwclock

To set the system clock to hardware clock:

hwclock -s

To set the hardware clock to the system clock:

hwclock -w

The main command for managing the time is timedatectl, to see the current time and timezone information:

timedatectl

To manually set the date and time:

timedatectl set-time 2020-18-03

timedatectl set-time 10:26:00

To set the timezone:

timedatectl set-timezone Australia/Melbourne

To list all available timezones:

timedatectl list-timezones

To get the timedatectl to use the Network Time Protocol (NTP):

timedatectl set-ntp yes

The NTP deamon is no longer used as of RHEL8 so we need to use chrony. To install the application run:

dnf install chronyd

Then start and enable the service:

systemctl start chronyd

systemctl enable chronyd

To edit the servers list edit the chrony.conf file and add entries starting with “server then IP address” and restart the chronyd service:

vi /etc/chrony.conf

systemctl restart chronyd

To see which servers chronyd is currently syncing with run:

chronyc sources

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