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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,  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,, packages  sysv-rc  or  file-rc  (depending  on
       which version of invoke-rc.d you are using).

       Debian Policy manual,

Debian Project                   1 March 2001                   INVOKE-RC.D(8)

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