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相關(guān)命令：chkconfig

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

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 informa‐

tion 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. Pos‐

sible 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 over‐

rides 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 run‐

levels 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

Files 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

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

Manual page chkconfig(8) line 81/130 (END) (press h for help or q to quit)

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