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
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
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
Warning
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.