Linux chkconfig man page

The following output is from the CentOS Linux chkconfig man page, which can be recreated on your CentOS Linux system by typing:

man chkconfig

CentOS Linux chkconfig man page

CHKCONFIG(8)                                                      CHKCONFIG(8)

       chkconfig  -  updates  and queries runlevel information for system 

       chkconfig --list [name]
       chkconfig --add name
       chkconfig --del name
       chkconfig [--level levels] name <on|off|reset>
       chkconfig [--level levels] name

       chkconfig provides a  simple  command-line  tool  for  maintaining  the
       /etc/rc[0-6].d  directory  hierarchy by relieving system administrators
       of the task of directly manipulating the  numerous  symbolic  links  in
       those directories.

       This  implementation of chkconfig was inspired by the chkconfig command
       present in the IRIX operating system. Rather than maintaining  configu-
       ration  information  outside  of the /etc/rc[0-6].d hierarchy, however,
       this version directly manages  the  symlinks  in  /etc/rc[0-6].d.  This
       leaves  all  of  the  configuration information regarding what services
       init starts in a single location.

       chkconfig has five distinct functions: adding new services for  manage-
       ment,  removing  services  from management, listing the current startup
       information for services, changing the  startup  information  for  ser-
       vices, and checking the startup state of a particular service.

       When  chkconfig  is run without any options, it displays usage informa-
       tion.  If only a service name is given, it checks to see if the service
       is  configured to be started in the current runlevel. If it is, chkcon-
       fig returns true; otherwise it returns false. The --level option may be
       used  to  have  chkconfig query an alternative runlevel rather than the
       current one.

       If one of on, off, or reset is specified after the service  name,  chk-
       config  changes the startup information for the specified service.  The
       on and off flags cause the service to be started  or  stopped,  respec-
       tively,  in  the  runlevels  being  changed.  The reset flag resets the
       startup information for the service to whatever  is  specified  in  the
       init script in question.

       By  default,  the on and off options affect only runlevels 2, 3, 4, and
       5, while reset affects all of the runlevels.  The --level option may be
       used to specify which runlevels are affected.

       Note that for every service, each runlevel has either a start script or
       a stop script.  When switching runlevels, init  will  not  re-start  an
       already-started  service,  and  will  not re-stop a service that is not

       chkconfig also can manage xinetd scripts via the means of xinetd.d con-
       figuration  files.  Note that only the on, off, and --list commands are
       supported for xinetd.d services.

       --level levels
              Specifies the run levels an operation should pertain to.  It  is
              given  as  a string of numbers from 0 to 7. For example, --level
              35 specifies runlevels 3 and 5.

       --add name

              This option adds a new  service  for  management  by  chkconfig.
              When  a new service is added, chkconfig ensures that the service
              has either a start or a kill entry in  every  runlevel.  If  any
              runlevel  is missing such an entry, chkconfig creates the appro-
              priate entry as specified by the  default  values  in  the  init
              script.  Note  that default entries in LSB-delimited ’INIT INFO’
              sections take precedence  over  the  default  runlevels  in  the

       --del name
              The  service  is removed from chkconfig management, and any sym-
              bolic links in /etc/rc[0-6].d which pertain to it are removed.

              Note that future package installs for this service may run  chk-
              config  --add,  which  will re-add such links. To disable a ser-
              vice, run chkconfig name off.

       --list name
              This option lists all of  the  services  which  chkconfig  knows
              about, and whether they are stopped or started in each runlevel.
              If name is specified, information in only display about  service

       Each  service which should be manageable by chkconfig needs two or more
       commented lines added to its init.d script. The first line  tells  chk-
       config  what  runlevels the service should be started in by default, as
       well as the start and stop priority levels. If the service should  not,
       by default, be started in any runlevels, a - should be used in place of
       the runlevels list.  The second line contains  a  description  for  the
       service,  and may be extended across multiple lines with backslash con-

       For example, random.init has these three lines:
       # chkconfig: 2345 20 80
       # description: Saves and restores system entropy pool for \
       #              higher quality random number generation.
       This says that the random script should be started in levels 2,  3,  4,
       and 5, that its start priority should be 20, and that its stop priority
       should be 80.  You should be able to figure out  what  the  description
       says;  the \ causes the line to be continued.  The extra space in front
       of the line is ignored.

       init(8) ntsysv(8) system-config-services(8)

       Erik Troan 

4th Berkeley Distribution       Wed Oct 8 1997                    CHKCONFIG(8)