Difference between revisions of "Netconsole"

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== Receiver ==
 
== Receiver ==
{{{
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<pre>
 
nc -u -l 6666
 
nc -u -l 6666
}}}
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</pre>

Revision as of 14:48, 10 February 2010

netconsole is a kernel module that sends all kernel log messages (i.e. dmesg) over the network to another computer, without involving user space (e.g. syslogd). It's really a misnomer because it's not really a "console", more like a remote logging service.

netconsole is mainly used for capturing kernel panic output from a headless machine, or in other situations where the user space is no more functional.

Documentation is available in the Linux kernel tree under [Documentation/networking/netconsole.txt http://lxr.linux.no/linux+v2.6.32/Documentation/networking/netconsole.txt]

Dynamic configuration

modprobe configfs
modprobe netconsole
mount none -t configfs /sys/kernel/config

mkdir /sys/kernel/config/target1
cd /sys/kernel/config/target1

# set target IP address
echo 192.168.0.17 > remote_ip
# find remote MAC address
arping 192.168.0.17 -f |grep -o ..:..:..:..:..:.. > remote_mac

echo 1 > enabled

netconsole should now be configured. To verify, run 'dmesg |tail' and you should see "netconsole: network logging started"

Receiver

nc -u -l 6666