11.2. Configuring the Services

To allow you to configure which services are started at boot time, Red Hat Enterprise Linux is shipped with the following utilities: the Service Configuration graphical application, the ntsysv text user interface, and the chkconfig command line tool.

Enabling the irqbalance service

To ensure optimal performance on POWER architecture, it is recommended that the irqbalance service is enabled. In most cases, this service is installed and configured to run during the Red Hat Enterprise Linux 6 installation. To verify that irqbalance is running, as root, type the following at a shell prompt:
~]# service irqbalance status
irqbalance (pid  1234) is running...
For information on how to enable and run a service using a graphical user interface, refer to Section 11.2.1, “Using the Service Configuration Utility”. For instructions on how to perform these task on the command line, see Section 11.2.3, “Using the chkconfig Utility” and Section 11.3, “Running Services” respectively.

11.2.1. Using the Service Configuration Utility

The Service Configuration utility is a graphical application developed by Red Hat to configure which services are started in a particular runlevel, as well as to start, stop, and restart them from the menu. To start the utility, select SystemAdministrationServices from the panel, or type the command system-config-services at a shell prompt.
The Service Configuration utility

Figure 11.1. The Service Configuration utility


The utility displays the list of all available services (services from the /etc/rc.d/init.d/ directory, as well as services controlled by xinetd) along with their description and the current status. For a complete list of used icons and an explanation of their meaning, see Table 11.2, “Possible service states”.
Note that unless you are already authenticated, you will be prompted to enter the superuser password the first time you make a change.

Table 11.2. Possible service states

Icon Description
The service is enabled.
The service is disabled.
The service is enabled for selected runlevels only.
The service is running.
The service is stopped.
There is something wrong with the service.
The status of the service is unknown.

11.2.1.1. Enabling and Disabling a Service

To enable a service, select it from the list and either click the Enable button on the toolbar, or choose ServiceEnable from the main menu.
To disable a service, select it from the list and either click the Disable button on the toolbar, or choose ServiceDisable from the main menu.

11.2.1.2. Starting, Restarting, and Stopping a Service

To start a service, select it from the list and either click the Start button on the toolbar, or choose ServiceStart from the main menu. Note that this option is not available for services controlled by xinetd, as they are started by it on demand.
To restart a running service, select it from the list and either click the Restart button on the toolbar, or choose ServiceRestart from the main menu. Note that this option is not available for services controlled by xinetd, as they are started and stopped by it automatically.
To stop a service, select it from the list and either click the Stop button on the toolbar, or choose ServiceStop from the main menu. Note that this option is not available for services controlled by xinetd, as they are stopped by it when their job is finished.

11.2.1.3. Selecting Runlevels

To enable the service for certain runlevels only, select it from the list and either click the Customize button on the toolbar, or choose ServiceCustomize from the main menu. Then select the checkbox beside each runlevel in which you want the service to run. Note that this option is not available for services controlled by xinetd.