CHKCONFIG(8) System Manager's Manual CHKCONFIG(8)
NAME
chkconfig - updates and queries runlevel information for system services
SYNOPSIS
chkconfig [--list] [--type type] [name]
chkconfig --add name
chkconfig --del name
chkconfig --override name
chkconfig [--level levels] [--type type] [--no-redirect] name <on|off|reset|resetpriorities>
chkconfig [--level levels] [--type type] [--no-redirect] 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 ver‐
sion directly manages the symlinks in /etc/rc[0-6].d. This leaves all of the configuration information regard‐
ing 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 with only a service name, 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.
When chkconfig is run with the --list argument, or no arguments at all, a listing is displayed of all services
and their current configuration.
If one of on, off, reset, or resetpriorities 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 on/off state for all run‐
levels for the service to whatever is specified in the init script in question, while the resetpriorities flag
resets the start/stop priorities for the service to whatever is specified in the init script.
By default, the on and off options affect only runlevels 2, 3, 4, and 5, while reset and resetpriorities
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 run‐
levels, 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.
chkconfig supports a --type argument to limit actions to only a specific type of services, in the case where
services of either type may share a name. Possible values for type are sysv and xinetd.
OPTIONS
--level levels
Specifies the run levels an operation should pertain to. It is given as a string of numbers from 0 to
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 miss‐
ing 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; if any Required-Start or Required-Stop entries are present, the
start and stop priorities of the script will be adjusted to account for these dependencies.
--del name
The service is removed from chkconfig management, and any symbolic links in /etc/rc[0-6].d which per‐
tain 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.
--override name
If service name is configured exactly as it would be if the --add option had been specified with no
override file in /etc/chkconfig.d/name, and if /etc/chkconfig.d/name now exists and is specified dif‐
ferently from the base initscript, change the configuration for service name to follow the overrides
instead of the base configuration.
--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.
chkconfig also supports LSB-style init stanzas, and will apply them in preference to "chkconfig:" lines where
available. A LSB stanza looks like:
### BEGIN INIT INFO
# Provides: foo
# Required-Start: bar
# Defalt-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Description: Foo init script
### END INIT INFO
In this case, the start priority of "foo" would be changed such that it is higher than the "bar" start prior‐
AUTHOR
Erik Troan <[email protected]>
4th Berkeley Distribution Wed Oct 8 1997 CHKCONFIG(8)
Back to main site | Back to man page index