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From: Gerrit Pape <pape@smarden.org>
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Subject: Re: rebooting on read-only /?
Date: Fri, 30 Jun 2006 08:01:09 +0000
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On Wed, Jun 28, 2006 at 06:27:19PM +0000, Robert Edmonds wrote:
> I have a server using runit as init and the only drive in the machine
> has experienced a block layer failure and has been write-protected.
> 
> Now, when I attempt to reboot,
> 
>    # init 6
>    init: fatal: unable to create /etc/runit/stopit: read-only file system
> 
> Is there any way to signal runit to reboot the machine without touching
> the filesystem, even uncleanly?  Maybe something akin to sysvinit's
> "reboot -f"?

Send the runsvdir process a TERM signal, so that stage 2 exits cleanly.
runit will then enter stage 3.

runsvdir(8):
SIGNALS
       If runsvdir receives a TERM signal,  it exits with 0 immediately.
runit(8):
STAGE 2
       runit runs /etc/runit/2, which  should  not  return  until system
       shutdown; if it crashes, or exits 111, it will be restarted.


IIRC 'reboot -f' doesn't do anything with the init process, but simply
hard-reboots the machine,  I posted a simple program that also does that
here
 http://article.gmane.org/gmane.comp.sysutils.supervision.general/315

HTH, Gerrit.