Date: Sun, 28 Aug 2022 16:57:15 +0000 From: Pete Wright <pete@nomadlogic.org> To: freebsd-questions@freebsd.org Subject: Re: turn on timestamps in kernel log messages? Message-ID: <20220828165715.fr3gvjk2esatukn5@shelly.nomadlogic.org> In-Reply-To: <YwuEu68m6kiRFNrc@void.f-m.fm> References: <YwuEu68m6kiRFNrc@void.f-m.fm>
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On Sun, Aug 28, 2022 at 04:07:39PM +0100, void wrote:
> Hello,
>
> In periodic daily emails it's recorded if there's anything
> in kernel log messages during the last 24 hrs. The problem
> is that the lines pertaining to these messages aren't timestamped
> so the information is of less use in tracking down a problem
> than it could be. Example:
>
> +pid 96879 (conftest), jid 8779, uid 0: exited on signal 11 (core dumped)
> +tap2: link state changed to DOWN +swap_pager: out of swap space
> +swp_pager_getswapspace(7): failed
>
> In the same email, login failures are timestamped.
>
> Is there a way to have kernel log messages timestamped so they appear as
> such in periodic daily emails?
>
i think you are looking for the kern.msgbuf_show_timestamp sysctl knob:
via dmesg(8)
kern.msgbuf_show_timestamp: 0
If set to 0, no timetamps are added. If set to 1, then a
1-second granularity timestamp will be added to most lines in the
message buffer. If set to 2, then a microsecond granularity
timestamp will be added. This may also be set as a boot
loader(8) tunable. The timestamps are placed at the start of
most lines that the kernel generates. Some multi-line messages
will have only the first line tagged with a timestamp.
-pete
--
Pete Wright
pete@nomadlogic.org
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