INVOKE-RC.D(8)                 Debian GNU/Linux                 INVOKE-RC.D(8)

       invoke-rc.d - executes System-V style init script actions

       invoke-rc.d   [--quiet]   [--force]   [--try-anyway]  [--disclose-deny]
       [--query] [--no-fallback] name action [init script parameters...]

       invoke-rc.d [--help]

       invoke-rc.d is a generic interface  to  execute  System  V  style  init
       script  /etc/init.d/name  actions, obeying runlevel constraints as well
       as any local policies set by the system administrator.

       All access to the init scripts by Debian packages'  maintainer  scripts
       should be done through invoke-rc.d.

       This manpage documents only the usage and behavior of invoke-rc.d.  For
       a discussion of the System V style init script arrangements please  see
       init(8).   More  information on invoke-rc.d can be found in the section
       on runlevels and init.d scripts of the Debian Policy Manual.

       The  standard  actions   are:   start,   stop,   force-stop,   restart,
       try-restart,  reload,  force-reload,  and  status.   Other  actions are
       accepted, but they can cause problems  to  policy-rc.d  (see  the  INIT
       SCRIPT  POLICY  section), so warnings are generated if the policy layer
       is active.

       Please note that not all init scripts will implement  all  the  actions
       listed  above,  and  that  the  policy  layer may override an action to
       another action(s), or even deny it.

       Any extra parameters will be passed to the init  script(s)  being  exe-

       If  an action must be carried out regardless of any local policies, use
       the --force switch.

       --help Display usage help.

              Quiet mode, no error messages are generated.

              Tries to run the init  script  regardless  of  policy  and  init
              script  subsystem  errors.   Use  of this option in Debian main-
              tainer scripts is severely discouraged.

              Tries to run the init script if a non-fatal error is detected.

              Return status code 101 instead of status  code  0  if  the  init
              script action is denied by the policy layer.

              Returns  one  of the status codes 100-106. Does not run the init
              script, and implies --disclose-deny and --no-fallback.

              Ignores any fallback action requests by the policy layer.  Warn-
              ing:  this is usually a very bad idea for any actions other than

       Should an init script be executed, invoke-rc.d always returns the  sta-
       tus  code  returned  by the init script. Init scripts should not return
       status codes in the 100+ range (which is reserved in Debian and by  the
       LSB). The status codes returned by invoke-rc.d proper are:

       0      Success.   Either the init script was run and returned exit sta-
              tus 0 (note that a fallback action may have been run instead  of
              the one given in the command line), or it was not run because of
              runlevel/local policy constrains and --disclose-deny is  not  in

       1 - 99 Reserved for init.d script, usually indicates a failure.

       100    Init  script  ID (name) unknown.  This means the init script was
              not registered successfully through update-rc.d or that the init
              script does not exist.

       101    Action  not allowed.  The requested action will not be performed
              because of runlevel or local policy constraints.

       102    Subsystem error.  Init script (or policy layer)  subsystem  mal-
              function. Also, forced init script execution due to --try-anyway
              or --force failed.

       103    Syntax error.

       104    Action allowed.  Init script would be run,  but  --query  is  in

       105    Behavior uncertain.  It cannot be determined if action should be
              carried out or not, and --query is in effect.

       106    Fallback  action  requested.   The  policy  layer   denied   the
              requested  action, and supplied an allowed fallback action to be
              used instead.

       invoke-rc.d introduces the concept of a policy layer which is  used  to
       verify  if  an  init  script should be run or not, or if something else
       should be done instead.  This layer has various uses, the most  immedi-
       ate ones being avoiding that package upgrades start daemons out-of-run-
       level, and that a package starts or stops daemons while inside a chroot

       The  policy layer has the following abilities: deny or approve the exe-
       cution of an action; request that another action (called a fallback) is
       to  be  taken, instead of the action requested in invoke-rc.d's command
       line; or request multiple actions to be tried in order,  until  one  of
       them succeeds (a multiple fallback).

       invoke-rc.d itself only pays attention to the current runlevel; it will
       block any attempts to start a service in a runlevel in which  the  ser-
       vice  is  disabled.  Other policies are implemented with the use of the
       policy-rc.d helper, and are only available if /usr/sbin/policy-rc.d  is
       installed in the system.

              System V init scripts.

              Init script policy layer helper (not required).

              file-rc  runlevel configuration (if the file-rc package is being

              System V runlevel configuration (if the sysv-rc package is being

       invoke-rc.d  special cases the status action, and returns exit status 4
       instead of exit status 0 when it is denied.

       Please  report  any  bugs  using  the  Debian  bug   tracking   system,, package sysv-rc or file-rc (depending on which
       version of invoke-rc.d you are using).

       Debian Policy manual,

       Henrique Holschuh

       Licence: GNU Public Licence v2 or Later (GPLv2+)

       2001 Hernique Holschuh

1 March 2001                                                    INVOKE-RC.D(8)

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