man > runit(8)

runit(8)                               System Manager's Manual                              runit(8)

NAME
       runit - a UNIX process no 1

SYNOPSIS
       runit

DESCRIPTION
       runit must be run as Unix process no 1.  It performs the system's booting, running, and shut‐
       down in three stages:

STAGE 1
       runit  runs /etc/runit/1 and waits for it to terminate.  The system's one time tasks are done
       here.  /etc/runit/1 has full control of /dev/console to be able to start an  emergency  shell
       if  the one time initialization tasks fail. If /etc/runit/1 crashes, or exits 100, runit will
       skip stage 2 and enter stage 3.

STAGE 2
       runit runs /etc/runit/2, which should not return until system shutdown; if it crashes, or ex‐
       its 111, it will be restarted.  Normally /etc/runit/2 starts runsvdir(8).  runit is  able  to
       handle the ctrl-alt-del keyboard request in stage 2, see below.

STAGE 3
       If  runit  is told to shutdown the system, or stage 2 returns, it terminates stage 2 if it is
       running, and runs /etc/runit/3.  The systems tasks to shutdown and possibly  halt  or  reboot
       the system are done here.  If stage 3 returns, runit checks if the file /run/runit.reboot ex‐
       ists and has the execute by owner permission set.  If so, the system is rebooted, it's halted
       otherwise.   If  /etc/runit/nosync  exists,  runit  doesn't  invoke sync(). This is useful in
       vservers.

CTRL-ALT-DEL
       If runit receives the ctrl-alt-del keyboard request and the file /etc/runit/ctrlaltdel exists
       and has the execute by owner permission set, runit runs /etc/runit/ctrlaltdel, waits  for  it
       to terminate, and then sends itself a CONT signal.

SIGNALS
       runit only accepts signals in stage 2.

       If  runit receives a CONT signal and the file /run/runit.stopit exists and has the execute by
       owner permission set, runit is told to shutdown the system.

       If runit receives a PWR signal, runit is told to shutdown the system.

       if runit receives an INT signal, a ctrl-alt-del keyboard request is triggered.

ENVIRONMENT
       When the runitdir=name variable is set and runit is init, runit will  check  if  a  directory
       named  name  exists in /etc/runit/runsvdir/ and then will use runsvchdir to change the direc‐
       tory of runsvdir to name in place of the default.

       If runitdir is set to runitdir=solo runit will use the solo directory  for  runsvdir  and  it
       will also refrain from start any sysv service that is enabled in /etc/rc2.d/ This is intended
       for use with containers that need to start only some selected services.

SEE ALSO
       runit-init(8), runsvdir(8), runsvchdir(8), sv(8), runsv(8), chpst(8), utmpset(8), svlogd(8)

       http://smarden.org/runit/

AUTHOR
       Gerrit Pape <pape AT smarden.org>

                                                                                            runit(8)