1.Enable a service to start automatically
1) chkconfig --level 3 SERVICENAME on (old command)
2) systemctl enable SERVICENAME.service (new command)
2.Disable a service to start automatically
1) chkconfig --level 3 SERVICENAME off (old command)
2) systemctl disable SERVICENAME.service (new command)
3.View service status(old command and old command)
1) service ...