Re: dmesg content lifetime

On Tue, 22 Nov 2022, Alexander Kabaev wrote:

> On Tue, 22 Nov 2022 09:12:28 -0600 (CST)
> Dan Mack <mack@macktronics.com> wrote:
>
>> It seems like dmesg content ages out over time.   Is there a way to
>> leave the contents based on a fixed memory size instead?
>>
>> Dan
>>
> I think this is how it works: the kernel message bugger is of fixed
> size and kernel and syslog sequences (dmesg -a) share it. The other
> syslog users eventually puts enough content in there to displace all of
> kernel messages. If the kernel stays quiet, 'dmesg' then returns
> nothing, as by default it filters syslog entries that do not KERN
> facility out, see sbin/dmesg/dmesg.c.
>
> -- 
> Alexander Kabaev
>

Thank you Alexander, I did not know this.  I'll USL (use-the-source-luke) 
:-)

Dan