Dell PowerConnect W Clearpass 100 Software 3.7 Deployment Guide - Page 323

System Control The System Control commands on the Administrator > System Control page allow you to:  Shut down the server immediately.  Reboot the system which stops all services while the reboot is taking place.  Restart the system services without stopping the server. This would usually be done after a plugin installation if required, or if performing other system changes such as installing a new SSL certificate or changing the server's time zone.  Schedule a reboot or shutdown operation to take place at a future point in time.  Configure the database and advanced system settings  Configure system-level log files  Configure Web servers and Web applications. Changing System Configuration Parameters The System Configuration form allows "sysctl" parameters to be modified. These parameters may be used to adjust advanced networking and kernel options and control other system properties that apply at the operating system level. Changing kernel options to incorrect values can result in a non-functional system. For this reason it is recommended not to change these values unless you are advised by Aruba support, or you have carefully tested the result of the change in a controlled environment. Click the Save Changes button to apply the new configuration parameters. The settings will be applied to the operating system immediately, but in some cases the new settings will not take effect until the system is rebooted. For this reason, it is recommended that you always reboot after modifying any of these parameters. System Log Configuration The System Log Configuration form allows you to modify options related to locally stored system log files, including the HTTP access log, HTTP error log, and the general-purpose system message log. You can also define a remote syslog server to which log messages will be sent, and specify which syslog messages should be sent. The syslog protocol is used to send log messages from one system to a syslog server (also known as a 'collector'). Log messages are grouped according to both facility and priority. The following priority levels are defined in the protocol:  0-Emergency: system is unusable  1-Alert: action must be taken immediately  2-Critical: critical conditions  3-Error: error conditions  4-Warning: warning conditions  5-Notice: normal but significant condition  6-Informational: informational messages  7-Debug: debug-level messages When a syslog server has been defined, messages matching the rules defined here are sent to the syslog server. The syslog protocol uses UDP port 514. Amigopod 3.7 | Deployment Guide Administrator Tasks | 323