Difference between revisions of "Netconsole"

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(configure local IP address too)
(document 'dmesg -n 8')
Line 7: Line 7:
 
== Dynamic configuration ==
 
== Dynamic configuration ==
 
<pre>
 
<pre>
 +
# set log level for kernel messages
 +
dmesg -n 8
 +
 
modprobe configfs
 
modprobe configfs
 
modprobe netconsole
 
modprobe netconsole

Revision as of 08:34, 7 December 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). "netconsole" is 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

Dynamic configuration

# set log level for kernel messages
dmesg -n 8

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

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

# set local IP address
echo 192.168.0.111 > local_ip
# set destination IP address
echo 192.168.0.17 > remote_ip
# find destination MAC address
arping `cat remote_ip` -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

or

nc -u -l -p 6666