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TABLE 21-4 Options for chkconfig
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nfs 0:off crond 0:off xinetd 0:off xinetd based time: finger: pop3s: swat: 1:off 2:off 3:off 4:off 5:off 6:off 1:off 2:on 3:on 4:on 5:on 6:off 1:off 2:off 3:on 4:on 5:on 6:off services: off off off on
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Starting and Stopping Services with chkconfig
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You use the on option to have a service started at specified runlevels and the off option to disable it You can specify the runlevel to affect with the --level option If no level is specified, chkconfig will use any chkconfig default information in a service s initd service script Distributions usually install their services with chkconfig default information already entered (if this is missing, chkconfig will use runlevels 3, 4, and 5) The following example has the web server (httpd) started at runlevel 5:
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chkconfig --level 5 httpd on
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The off option configures a service to shut down if the system enters a specified runlevel The next example shuts down the web server if runlevel 3 is entered If the service is not running, it remains shut down:
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The reset option restores a service to its chkconfig default options as specified in the service s initd service script:
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21:
Managing Services
To see just the startup information for a service, you use just the service name with the
--list option:
chkconfig --list httpd httpd 0:off 1:off 2:off 3:on 4:off 5:on 6:off
Enabling and Disabling xinetd Services with chkconfig
The chkconfig command can also enable or disable xinetd services Simply enter the xinetd service with either an on or off option The service will be started up or shut down, and the disable line in its xinetd configuration script in the /etc/xinetdd directory will be edited accordingly For example, to start SWAT, the Samba configuration server, which runs on xinetd, you simply enter
chkconfig swat on chkconfig --list swat swat on
The swat configuration file for xinetd, /etc/xinetdd/swat, will have its disable line edited to no, as shown here:
disable=no
If you want to shut down the SWAT server, you can use the off option This will change the disable line in /etc/xinetdd/swat to read disable=yes
chkconfig swat off
The same procedure works for other xinetd services such as the POP3 server and finger
Removing and Adding Services with chkconfig
If you want a service removed entirely from the entire startup and shutdown process in all runlevels, you can use the --del option This removes all startup and shutdown links in all the runlevel directories
chkconfig --del httpd
You can also add services to chkconfig management with the --add option; chkconfig will create startup links for the new service in the appropriate startup directories, /etc/rcd/rcnd If you have previously removed all links for a service, you can restore them with the add option
chkconfig --add httpd
Configuring xinetd Services for Use by chkconfig
Default runlevel information should be placed in the service scripts that are to be managed by chkconfig You can edit these scripts to change the default information if you wish This information is entered as a line beginning with a # sign and followed by the chkconfig keyword and a colon Then you list the default runlevels that the service should start up on, along with the start and stop priorities The following entry lists runlevels 3 and 5 with
PART VI
Part VI:
Internet and Network Services
a start priority of 85 and a stop of 15 See the section Service Script Tags for more information:
# chkconfig: 35 85 15
Thus, when a user turns on the httpd service with no level option specified, chkconfig will start up httpd at runlevels 3 and 5
chkconfig httpd on
How chkconfig Works
The chkconfig tool works by creating startup and shutdown links in the appropriate runlevel directories in the /etc/rcd directory For example, when chkconfig adds the httpd service at runlevel 5, it creates a link in the /etc/rcd/rc5d directory to the service script httpd in the /etc/initd directory When it turns off the web service from runlevel 3, it creates a shutdown link in the /etc/rcd/rc3d directory to use the script httpd in the /etc/ initd directory to make sure the web service is not started In the following example, the user turns on the web service (httpd) on runlevel 3, creating the startup link in rc5d, S85httpd, and then turns off the web service on runlevel 3, creating a shutdown link in rc3d, K15httpd
chkconfig --level 5 httpd on ls /etc/rcd/rc5d/*httpd /etc/rcd/rc5d/S85httpd chkconfig -level 3 httpd off ls /etc/rcd/rc3d/*httpd /etc/rcd/rc3d/K15httpd
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