on ubuntu 11.04, why isn't rsyslog logging my kernel msgs?

Marius Gedminas marius at pov.lt
Thu Aug 11 13:28:24 UTC 2011


On Wed, Aug 10, 2011 at 12:42:10PM -0400, Robert P. J. Day wrote:
>   probably something stupid i'm doing but on my 64-bit ubuntu 11.04
> system, i'm loading kernel modules that print simple strings using
> printk() but nothing is showing up in /var/log/kern.log.

Do you see them in dmesg?

Do you specify the severity level for those printk messages?

>   i've verified that rsyslog is running, and here's the salient bit
> from /etc/rsyslog.d/50-default.conf:
> 
>   kern.*                          -/var/log/kern.log
> 
> which i've always understood is to send all kern-level messages to
> that log file, but nothing shows up.

Do normal kernel messages show up there?

>   i've even used "logger" to try to send a message like that:
> 
> $ logger -p kern.info "hi there"
> 
> but, still, nothing.

Check /var/log/syslog, you will see your "hi there" message there.  I'm
not sure why the 'kern' facility ends up being ignored.  Could be a
security measure: you don't want arbitrary users to insert fake messages
pretending to be from the kernel in your log files.

>   i've read in a couple places that going back to syslog-ng will fix
> things, but i'd still like to know what i'm doing wrong.  thanks.

Marius Gedminas
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