2005-04-17 06:20:36 +08:00
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started by Ingo Molnar <mingo@redhat.com>, 2001.09.17
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2.6 port and netpoll api by Matt Mackall <mpm@selenic.com>, Sep 9 2003
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Please send bug reports to Matt Mackall <mpm@selenic.com>
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This module logs kernel printk messages over UDP allowing debugging of
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problem where disk logging fails and serial consoles are impractical.
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It can be used either built-in or as a module. As a built-in,
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netconsole initializes immediately after NIC cards and will bring up
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the specified interface as soon as possible. While this doesn't allow
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capture of early kernel panics, it does capture most of the boot
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process.
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It takes a string configuration parameter "netconsole" in the
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following format:
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netconsole=[src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
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where
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src-port source for UDP packets (defaults to 6665)
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src-ip source IP to use (interface address)
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dev network interface (eth0)
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tgt-port port for logging agent (6666)
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tgt-ip IP address for logging agent
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tgt-macaddr ethernet MAC address for logging agent (broadcast)
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Examples:
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linux netconsole=4444@10.0.0.1/eth1,9353@10.0.0.2/12:34:56:78:9a:bc
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or
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insmod netconsole netconsole=@/,@10.0.0.2/
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Built-in netconsole starts immediately after the TCP stack is
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initialized and attempts to bring up the supplied dev at the supplied
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address.
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The remote host can run either 'netcat -u -l -p <port>' or syslogd.
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WARNING: the default target ethernet setting uses the broadcast
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ethernet address to send packets, which can cause increased load on
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other systems on the same ethernet segment.
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NOTE: the network device (eth1 in the above case) can run any kind
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of other network traffic, netconsole is not intrusive. Netconsole
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might cause slight delays in other traffic if the volume of kernel
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messages is high, but should have no other impact.
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Netconsole was designed to be as instantaneous as possible, to
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enable the logging of even the most critical kernel bugs. It works
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from IRQ contexts as well, and does not enable interrupts while
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2006-10-04 04:53:09 +08:00
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sending packets. Due to these unique needs, configuration cannot
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2005-04-17 06:20:36 +08:00
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be more automatic, and some fundamental limitations will remain:
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only IP networks, UDP packets and ethernet devices are supported.
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