As noted previously for the crond service, you can select certain services to run and the runlevel at which to run them. Most services are servers like a Web server or proxy server. Other services provide security, such as SSH or Kerberos. You can decide which services to use with the
chkconfig , service, or redhat-config-services tools. These are described here briefly, and in more detail in Chapter 20.
To configure a service to start up automatically, you can use the redhat-config-services tool available on the desktop or the
chkconfig tool, which is run on a command line. redhat-config-services will display a list of available services, letting you choose the ones you want to start and deselect. The
chkconfig command uses the
on and
off options to select and deselect services for startup (see Chapter 20 for more details).
chkconfig httpd on
To start and stop services manually, you can user either redhat-config-services or the
service command. With the
service command, you list the service with the
stop argument to stop it, the
start argument to start it, and the
restart argument to restart it.
service httpd start
Most administration tools provide interfaces displaying a simple list of services from which you can select the ones you want to start up. On the redhat-config-services tool, the main panel lists different daemons and servers that you can have start by just clicking a check box.