Re: Issue on netconsole vs. Linux kernel oops

[linux-os]

On Thu, 16 Dec 2004, Matt Mackall wrote:

> On Thu, Dec 16, 2004 at 10:48:27AM -0800, Park Lee wrote:
> > Hi,
> >   I'd like to use netconsole to send local Linux
> > kernel's final messages (i.e. oops) to remote machine
> > when the kernel crashes.
> >   Now I can successfully use a built-in netconsole to
> > send some loacl kernel messages to the remote machine.
> > (the parameter I send to local kernel on kernel
> > command line is
> > "netconsole=@xxxxxxxxxxx/,514@xxxxxxxxxxx/", I run
> > syslogd in remote machine). For example, When the
> > local kernel is booting, it will send a message
> > "192.168.0.2 audit(1103247021.091:0): initialized" to
> > remote machine through netconsole, and the syslogd on
> > remote machine will write the message to
> > /var/log/messages on remote machine.
> >   What CONFUSE me most is that when the kernel
> > crashes, there is NO message (oops) about the crash
> > being wrote down by syslogd on remote machine to
> > remote /var/log/messages file at all!!
> >   But in the mean time, We can see the outputs of
> > tcpdump on the remote machine, they are some thing
> > like the following:
> >
> > 01:36:56.692877 IP 192.168.0.2.6665 >
> > 192.168.0.1.syslog: UDP, length 48
> > 01:36:56.692930 IP 192.168.0.2.6665 >
> > 192.168.0.1.syslog: UDP, length 29
> > 01:36:56.692982 IP 192.168.0.2.6665 >
> > 192.168.0.1.syslog: UDP, length 15
> > 01:36:56.693034 IP 192.168.0.2.6665 >
> > 192.168.0.1.syslog: UDP, length 9
> > 01:36:56.693086 IP 192.168.0.2.6665 >
> > 192.168.0.1.syslog: UDP, length 16
> > 01:36:56.693121 IP 192.168.0.2.6665 >
> > 192.168.0.1.syslog: UDP, length 16
> >    ... ...
> >
> >   From these messages, we can see that the netconsole
> > actually have sent the final messages (oops) to remote
> > machine when the local kernel crashed. But there are
> > no corresponding messages recorded by syslogd on
> > remote machine to /var/log/messages.
>
> > From your description, it sounds like syslogd is at fault. Try using
> netcat on the remote machine.
>
> --
> Mathematics is the supreme nostalgia of our time.


Depends upon the vendor of your installation, but some require
loghost to be defined in /etc/hosts as the same as localhost and
/etc/nsswitch.conf configured to actually look at that.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.9 on an i686 machine (5537.79 BogoMips).
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