[lxc-users] How to cancel lxc-autostart

[Michael H. Warfield]

On Fri, 2014-08-08 at 16:50 -0400, CDR wrote:
> After I reboot, the LXC service will start automatically all the
> containers marked for auto-start. I have not found a way to stop that
> mechanism if I absolutely need that the containers to not start.
> Suppose I need to umount the partition to issue an "fsck", etc. How do
> I preempt the automatic behavior?
> It is something like the Iron Dome. Hundreds of containers are on the
> air and will be started, how do you override this behavior?

I would suggest putting them in a different group and deferring their
startup until you're sure you don't need to interrupt the process if
that's your problem.  You could easily script that.  Just run a bootup
timer out of cron and run "lxc-autostart -g "defer-boot-group".
Otherwise, you're going to be piled with race conditions.

Regards,
Mike

> On Fri, Aug 8, 2014 at 4:22 PM, Łukasz Górski <l.gorski at lokis.info> wrote:
> > Could you perhaps clarify when exactly do you want this command to be
> > invoked? Before the reboot or after? If after, perhaps I am mistaken, but it
> > doesn't seem to make any sense whatsoever. I suppose you'd need to run it in
> > a specific timeframe before the containers are started - how much time it
> > takes from the moment you get a working shell after the reboot to the point
> > when container booting process starts? If you want to run it before the
> > reboot, then I guess some shell scripting most likely would do to disable
> > autostart and the re-enable it back again after reboot.
> >
> > Pozdrawiam
> > Łukasz Górski
> > Biuro Obsługi Klienta LOKIS
> > www.lokis.info
> >
> > ---
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> >
> >
> >
> > 2014-08-08 21:21 GMT+02:00 CDR <venefax at gmail.com>:
> >>
> >> Suppose you manage a box with 300 containers, all on autostart=1. One day
> >> you reboot the box but you need to avoid all the contaoners to start. There
> >> should be a command like
> >> lxc-cancel-autostart.
> >> Does it make sense?
> >>
> >>
> >> On Friday, August 8, 2014, Harald Dunkel <harald.dunkel at aixigo.de> wrote:
> >>>
> >>> I am not familiar with Ubuntu's setup, but assuming it supports
> >>> sysv-init I would suggest to omit lxc in a dedicated run level.
> >>>
> >>> If your default run level is 2 (specified in /etc/inittab), then
> >>> you could use update-rc.d to omit lxc in run level 3, e.g.
> >>>
> >>>         # update-rc.d lxc start 20 2 4 5 . stop 20 0 1 3 6 .
> >>>
> >>> This means lxc is started in run levels 2, 4 and 5, and
> >>> stopped in 0, 1, 3 and 6.
> >>>
> >>> If you need to boot without starting the containers, then you
> >>> can choose run level 3 on the kernel command line at boot time,
> >>> e.g.
> >>>         linux /boot/vmlinuz root= ... quiet 3
> >>>
> >>> grub2 allows you to modify the kernel command line before booting.
> >>> Using telinit you can change the run level at run time, e.g.
> >>> 'telinit 2' to switch to run level 2 (to start your containers).
> >>>
> >>>
> >>> Hope this helps
> >>> Harri
> >>>
> >>> _____________________________________________he__
> >>>
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> >>> http://lists.linuxcontainers.org/listinfo/lxc-users
> >>
> >>
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> >>
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> >
> >
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-- 
Michael H. Warfield (AI4NB) | (770) 978-7061 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
 PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!

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