G. Pape
runit
runit - a UNIX process no 1
runit
runit must be run
as Unix process no 1. It performs the system's booting, running, and shutdown
in three Stages:
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 itself crashes, runit will skip
stage 2 and enter stage 3.
runit runs /etc/runit/2, which should
not return until system shutdown; if it crashes, it will be restarted. Normally
/etc/runit/2 starts svscanboot(8). runit is able to handle the ctrl-alt-del
keyboard request in Stage 2, see below.
If runit is told to shutdown
the system, or the Stage 2 returns without errors, it terminates Stage
2 if it is running, and runs /etc/runit/3. The systems tasks to shutdown
and halt or reboot are done here. Normally in Stage 3 /etc/runit/3 checks
for the file /etc/runit/reboot. If it exists, the system is rebooted, it
is halted otherwise.
If runit receives the ctrl-alt-del keyboard
request and the file /etc/runit/ctrlaltdel exists, runit runs /etc/runit/ctrlaltdel,
waits for it to terminate and then sends itself a CONT signal.
runit
only accepts signals in Stage 2.
If runit receives a CONT signal and the
file /etc/runit/stopit exists, runit is told to shutdown the system.
if
runit receives an INT signal, a ctrl-alt-del keyboard request is triggered.
runit-init(8), svwaitdown(8), svwaitup(8), utmpset(8)
http://smarden.org/runit/
Gerrit Pape <pape@smarden.org>
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