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This video is based on RHEL 8. Video to cover the section ‘Schedule tasks using at and cron’ for the RHCSA (Red Hat Certified System Administrator).
More information on the required learning: http://bit.ly/rhcsa8
Notes from the video:
Management of services are all controlled via the systemctl application. To start a service (note atd is used in this instance and systemctl presumes its a .service extension in this case):
# systemctl start atd
To restart a service:
#systemctl restart atd
To ask a service to reload its configuration (if you have made changes to a local configuration file):
# systemctl reload atd
If you are unsure if the application supports reloading, then you can ask systemctl to try reloading and if doesn’t work then restart the service:
# systemctl reload-or-restart atd
To enable the service to run at startup (note this reads the configuration of the service to see which targets it should run with):
# systemctl enable atd.service
To disable a service from running at boot:
# systemctl enable atd.service
To check if the service is enabled to run at boot:
# systemctl is-enabled atd
To check if the service is running correctly:
# systemctl is-failed atd
To check the systemctl configuration of the service:
# systemctl cat atd.service
To list all the dependencies of the service and confirm if they are all running:
# systemctl list-dependencies atd.service
To completely disable a service (stops from starting up with the system and being started by a user):
# systemctl mask atd.service
To re-enable the service:
# systemctl unmask atd.service
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