Topic 9

Dates: 3/28/2018
Start-up and Run Levels. Scheduled jobs (at, cron)
Linux System Administration


Exercises: admin commands to start/stop services


Systemd driven services
Available on Ubuntu 16.04 and RedHat 7
Command systemctl talks to systemd. To see all the services registered with systemd, run the following: 

systemctl list-units --type service
To stop rsyslog services, run 

systemctl stop rsyslog
To see the status of the service: 

systemctl status rsyslog
Stop syslog.socket then rsyslog.service: 

systemctl stop syslog.socket
systemctl stop rsyslog.service
To see the status of the service: 

systemctl status rsyslog
To start the service and see its status: 

systemctl start rsyslog
systemctl status rsyslog

Legacy System V services
Used to be available on any Linux distro. Now they are provided within Systemd for backward compatibility.
The System V (non-event driven) service startup scripts are located in directory /etc/init.d. For example to stop and then start cups printing service, use the following 

apt-get install cups
/etc/init.d/cups stop
/etc/init.d/cups start
/etc/init.d/cups status
Is the same as 

service cups stop
service cups start
service cups status



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