chkconfig(8)
NAME
chkconfig - updates and queries runlevel information for system services
SYNOPSIS
chkconfig --list [name] chkconfig --add name chkconfig --del name chkconfig [--level levels] name <on|off|reset> chkconfig [--level levels] name
DESCRIPTION
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 configuration 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 management, removing services from management, listing the current startup
information for services, changing the startup information for services, and checking the startup state of a particular service.
When chkconfig is run without any options, it displays usage information. 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, chkconfig 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, chkconfig changes the startup information for the specified service. The
on and off flags cause the service to be started or stopped, respectively, 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
running.
chkconfig also can manage xinetd scripts via the means of xinetd.d configuration files. Note that only the on, off, and --list commands are
supported for xinetd.d services.
OPTIONS
- --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 appropriate 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 initscript.- --del name
- The service is removed from chkconfig management, and any symbolic links in /etc/rc[0-6].d which pertain to it are removed.
- Note that future package installs for this service may run chkconfig --add, which will re-add such links. To disable a service, 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 name.
RUNLEVEL FILES
Each service which should be manageable by chkconfig needs two or more
commented lines added to its init.d script. The first line tells chkconfig 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 continuation.
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.
SEE ALSO
init(8) ntsysv(8) system-config-services(8)
AUTHOR
- Erik Troan <ewt@redhat.com>