dmesg bootup-info removed/overwritten by syslogd ?
jez.hancock at munk.nu
Sun Apr 4 22:05:56 PDT 2004
On Mon, Apr 05, 2004 at 01:15:29PM +0900, Rob wrote:
> I wanted to see my original bootup messages again. So I typed
> dmesg, but all I got were 'arplookup' lines.
> I'm puzzled, where the bootup messages have gone?
Overwritten by kernel debug messages. There have been a number of
similar questions for a while, the gist is that when the dmesg buffer
gets filled up, it starts to overwrite itself. This affects the
daily periodic output and makes it look munged. I don't think any
solution has ever been offered up - I'd certainly be interested in it :P
> I have two files in /var/log: dmesg.today and dmesg.yesterday
> Both files are completely filled with this line:
> arplookup 18.104.22.168 failed: host is not on local network
> How can I see the original bootup messages from the kernel?
One way is to cat the output from bootup dmesg into a file at boot time
- in /etc/rc.local put this:
dmesg > /var/log/dmesg.boot
if you wanted to get fancy you could use the date(1) command to
timestamp the files ala:
dmesg > /var/log/dmesg.boot.`date "+%Y%m%d"`
> Do I have to reboot for that :( ?
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