Accessing the console on many devices is difficult.
netconsole eases debugging on devices that crash
after the network is up.
Reference to the netconsole documentation in upstream Linux:
<https://www.kernel.org/doc/html/latest/networking/netconsole.html>
|
|netconsole=[+][src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
|
| where
| + if present, enable extended console support
| src-port source for UDP packets (defaults to 6665)
| src-ip source IP to use (interface address)
| dev network interface (eth0)
| tgt-port port for logging agent (6666)
| tgt-ip IP address for logging agent
| tgt-macaddr ethernet MAC address for logging agent (broadcast)
OpenWrt specific notes:
OpenWrt's device userspace scripts are attaching the network
interface (i.e. eth0) to a (virtual) bridge (br-lan) device.
This will cause netconsole to report:
|network logging stopped on interface eth0 as it is joining a master device
(and unfortunately the traffic/logs to stop at this point)
As a workaround, the netconsole module can be manually loaded
again after the bridge has been setup with:
insmod netconsole netconsole=@/br-lan,@192.168.1.x/MA:C...
One way of catching errors before the handoff, try to
append the /etc/modules.conf file with the following extra line:
options netconsole netconsole=@/eth0,@192.168.1.x/MA:C...
and install the kmod-netconsole (=y) into the base image.
Signed-off-by: Catalin Toda <catalinii@yahoo.com>
(Added commit message from PR, added links to documentation)
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
488b25f5ac