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19.5. chkconfig
The
chkconfig command can also be used to activate and deactivate services. The chkconfig --list command displays a list of system services and whether they are started (on) or stopped (off) in runlevels 0-6. At the end of the list is a section for the services managed by xinetd.
If the
chkconfig --list command is used to query a service managed by xinetd, it displays whether the xinetd service is enabled (on) or disabled (off). For example, the command chkconfig --list finger returns the following output:
finger on
finger on
As shown,
finger is enabled as an xinetd service. If xinetd is running, finger is enabled.
If you use
chkconfig --list to query a service in /etc/rc.d, service's settings for each runlevel are displayed. For example, the command chkconfig --list httpd returns the following output:
httpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
httpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
chkconfig can also be used to configure a service to be started (or not) in a specific runlevel. For example, to turn nscd off in runlevels 3, 4, and 5, use the following command:
chkconfig --level 345 nscd off
chkconfig --level 345 nscd offWarning
Services managed by
xinetd are immediately affected by chkconfig. For example, if xinetd is running, finger is disabled, and the command chkconfig finger on is executed, finger is immediately enabled without having to restart xinetd manually. Changes for other services do not take effect immediately after using chkconfig. You must stop or start the individual service with the command service daemon stop. In the previous example, replace daemon with the name of the service you want to stop; for example, httpd. Replace stop with start or restart to start or restart the service.
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