Date: Thu, 17 Jan 2013 11:34:07 -0500 From: Mark Johnston <markjdb@gmail.com> To: Sami Halabi <sodynet1@gmail.com> Cc: freebsd-hackers@freebsd.org, Ian Lepore <ian@freebsd.org> Subject: Re: Failsafe on kernel panic Message-ID: <20130117163407.GA1940@raichu> In-Reply-To: <CAEW%2BogY_SK-D0eQf-jqX3RSxpXZbVK_OmRUh=Ff2yO%2BjigNT_A@mail.gmail.com> References: <CAEW%2BogYvJih5nEpFWPDjfRWxeURQYp=KM=WckmKB_VB=CxEUbQ@mail.gmail.com> <201301161513.27016.jhb@freebsd.org> <CAEW%2BogbQ3WD3ekVZ0GCgsd3UbL1YHzra-=jKEo6-1t11OMYkFg@mail.gmail.com> <1358392725.32417.179.camel@revolution.hippie.lan> <CAEW%2BogaTKTdG=dvZfR1=E3t5v_X98bXTrGWrzp=pNexUa3aYPg@mail.gmail.com> <CAEW%2Bogb4Zj6F-usbYyCbw9yHx-DaigT2G07HTXsqT1MvY=K2Eg@mail.gmail.com> <1358429728.32417.193.camel@revolution.hippie.lan> <CAEW%2BogY_SK-D0eQf-jqX3RSxpXZbVK_OmRUh=Ff2yO%2BjigNT_A@mail.gmail.com>
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On Thu, Jan 17, 2013 at 04:14:21PM +0200, Sami Halabi wrote: > Hi, > Upon panic no auto restart occurs. > How do I know/activate these watchdogs? > Sami You can try starting watchdogd with 'service watchdogd onestart', and have it automatically start during boot by adding 'watchdogd_enable="YES"' to rc.conf. You can test by starting watchdogd and sending SIGKILL to it - if everything's working properly, the system should reboot after the timeout period (16s by default). If you don't have a hardware watchdog (or have one that isn't supported by any drivers), watchdogd will fail to start. -Mark > בתאריך 17 בינו 2013 15:35, מאת "Ian Lepore" <ian@freebsd.org>: > > > On Thu, 2013-01-17 at 08:38 +0200, Sami Halabi wrote: > > > btw: i don't see any options in my kernel config for KBD / Unatteneded , > > th > > > eonly thing that mention its > > > is: device ukbd > > > > > > Sami > > > > I think if you don't have any kdb options turned on, then a panic should > > automatically store a crashdump to swap, then reboot the machine. If > > that's not working, perhaps it locks up trying to store the dump? > > > > If the hardware has a watchdog timer, enabling that might be the best > > way to ensure a reboot on any kind of crash or hang. > > > > -- Ian > > > > > > > On Thu, Jan 17, 2013 at 6:45 AM, Sami Halabi <sodynet1@gmail.com> wrote: > > > > > > > Its only a kernel option? There is no flag to pass to the loader? > > > > > > > > SAMI > > <> 17 2013 05:18, "Ian Lepore" <ian@freebsd.org>: > > > > > > > > On Wed, 2013-01-16 at 23:27 +0200, Sami Halabi wrote: > > > >> > Thank you for your response, very helpful. > > > >> > one question - how do i configure auto-reboot once kernel panic > > occurs? > > > >> > > > > >> > Sami > > > >> > > > > >> > > > >> From src/sys/conf/NOTES, this may be what you're looking for... > > > >> > > > >> # > > > >> # Don't enter the debugger for a panic. Intended for unattended > > operation > > > >> # where you may want to enter the debugger from the console, but still > > > >> want > > > >> # the machine to recover from a panic. > > > >> # > > > >> options KDB_UNATTENDED > > > >> > > > >> But I think it only has meaning if you have option KDB in effect, > > > >> otherwise it should just reboot itself after a 15 second pause. > > > >> > > > >> -- Ian > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > > >> > On Wed, Jan 16, 2013 at 10:13 PM, John Baldwin <jhb@freebsd.org> > > wrote: > > > >> > > > > >> > > On Wednesday, January 16, 2013 2:25:33 pm Sami Halabi wrote: > > > >> > > > Hi everyone, > > > >> > > > I have a production box, in which I want to install new kernel > > > >> without > > > >> > > any > > > >> > > > remotd kvn. > > > >> > > > my problem is its 2 hours away, and if a kernel panic occurs I > > got a > > > >> > > > problem. > > > >> > > > I woner if I can seg failsafe script to load the old kernel in > > case > > > >> of > > > >> > > > psnic. > > > >> > > > > > >> > > man nextboot (if you are using UFS) > > > >> > > > > > >> > > -- > > > >> > > John Baldwin > > > >> > > > > > >> > > > > >> > > > > >> > > > > >> > > > >> > > > >> > > > > > > > > > -- > > > Sami Halabi > > > Information Systems Engineer > > > NMS Projects Expert > > > FreeBSD SysAdmin Expert > > > _______________________________________________ > > > freebsd-hackers@freebsd.org mailing list > > > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > > > To unsubscribe, send any mail to " > > freebsd-hackers-unsubscribe@freebsd.org" > > > > > > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
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