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Service Management Tools: chkconfig and redhat-config-services
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On Red Hat, redhat-config-services and the chkconfig command provide simple interfaces you can use to choose what servers you want started up and how you want them to run. You use these tools to control any daemon you want started up, including system services such as cron, the print server, remote file servers for Samba and NFS, authentication servers for Kerberos, and, of course, Internet servers for FTP or HTTP. Such daemons are referred to as services, and you should think of these tools as managing these services. Any of these services can be set up to start or stop at different runlevels. These tools manage services that are started up by scripts in the /etc/rc.d/init.d directory. If you add a new service, both chkconfig and redhat-config-services can manage it. As described in the following section, services are started up at specific runlevels using startup links in various runlevel directories. These links are connected to the startup scripts in the init.d directory. Runlevel directories are numbered from 0 to 6 in the /etc/rc.d directory, such as /etc/rc.d/rc3.d for runlevel 3 and /etc/rc.d/rc5.d for runlevel 5. Removing a service from a runlevel only changes its link in the corresponding runlevel rc.d directory. It does not touch the startup script in the init.d directory.
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TIP The KDE The System V Init Editor features a GUI interface to enable you to manage any daemons on your system easily Internet servers as well as system daemons, such as print servers.
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With the Red Hat redhat-config-services utilities, you can simply select from a list of commonly used services the ones that you want to run when your system boots up. You can access redhat-config-services from the Services icon in the Server Settings window or menu. redhat-configservices lets you start, stop, and restart a server, much like the service command. redhat-config-services provides a Gnome GUI interface for easy use. It displays a list of your installed servers, with checked checkboxes for those currently chosen to start up. You can start, stop, or restart, any particular service by selecting it, and choosing either Start Service, Stop Service, or Restart Service from the Action menu. You can also set startup runlevels for services, just as you can with chkconfig, though you are limited to levels 3, 4, and 5. The list of checked entries differs depending on the runlevel you choose from the Edit Runlevel menu. In effect, you are choosing which services to start at a given runlevel. The default is runlevel 5, the GUI startup level. You may want a different set of services started or stopped for runlevel 3, the command-line startup level. In that case, you would select Runlevel 3 from the Edit Runlevel menu to display the services with selected checkboxes for runlevel 3.
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chkconfig
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You can specify the service you want start and the level you want to start it at with the chkconfig command. Unlike other service management tools, chkconfig works equally well on standalone and on xinetd services. Though standalone services can be run at any runlevel, you can also turn xinetd services on or off for the runlevels that xinetd runs in. Table A-1 lists the different chkconfig options.
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Service Management Tools
Option --level runlevel --list service
Description Specifies a runlevel to turn on, off, or reset a service.
Lists startup information for services A at different runlevels. xinetd services are just on or off. With no A argument, all services are listed, including xinetd services. Adds a service, creating links in the default specified runlevels (or all runlevels, if none are specified). Deletes all links for the service (startup and shutdown) in all runlevel directories. Turns a service on, creating a startup link in the specified or default runlevel directories. Turns a service off, creating shutdown links in specified or default directories Resets service startup information, creating default links as specified in the chkconfig entry in the service s init.d startup script.
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