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 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 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 runlevels 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 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.
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 6. For example, --level
35 specifies runlevels 3 and 5.
--no-redirect
When chkconfig is run on a system that uses systemd as its init
system, chkconfig will forward commands to systemd if a systemd
service file exists for it. This switch turns off the
redirection to systemd and only operates on the symlinks in
/etc/rc[0-6].d. This option is only valid when on, off, or no
command (to check enablement) is passed to a service.
--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; 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 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.
--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 differently 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 priority, if "bar" is enabled. Care
must be taken when adding dependencies, as they can cause vast shifts
in the start and stop priorities of many scripts.
OVERRIDE FILES
File in /etc/chkconfig.d/servicename are parsed using the same comments
that chkconfig notices in init service scripts, and override values in
the init service scripts themselves.
SEE ALSO
init(8) ntsysv(8) system-config-services(8)
AUTHOR
Erik Troan <ewt@redhat.com>