Listens to the network for clients that crash and uses the netdump
protocol to recieve a memory dump and a stack trace. The memory dump
and oops message are stored in a timestamped directory in /var/crash.
The server can also run scripts when some events happen.
OPTIONS
--port portnumber
Specifies the IP port number for the netdump server to listen to.
The default is 6666.
--concurrent number
You can limit the amount of concurrent dumps being done at any one
time. If more clients than the specified maximum connects at one time
the last ones will just be logged and then rebooted.
--pidfile path
Store a pidfile. The default service uses /var/run/netdump-server.pid.
The default is not to write a pidfile.
--daemon
netdump-server should background itself and run as a daemon.
--secure
Specify a 0 here to disable the client authentication bits. This will
enable any client to dump core to this server without any credentials. If
using this option, you may specify the
NETDUMPKEYEXCHANGE=none option in
/etc/sysconfig/netdump on the client systems.
EXAMPLES
netdump-server --daemon
This launches the netdump-server and puts it in the background,
listening for crashed clients.
EXIT STATUS
Exit status is 0 for a clean exit and non-0 for a non-clean
exit.
FILES
/etc/netdump.conf
A configuration file read by netdump-server on startup. It is a
"key=value" style file. Currently it supports the options:
port, max_concurrent_dumps, daemon, pidfile and secure.
/etc/init.d/netdump-server
An init script to start a default system installation of netdump-server.
This is normally turned off by default; use the command
/sbin/chkconfig netdump-server on
to enable the netdump-server service.
/var/crash
The main directory where the crash dump files are stored. Each dump
is put in a subdirectory named with the ip of the crashed machine and
the date and time of the crash.
/var/crash/scripts
This directory can contain scripts that are run at various times.
The script files should be executable and owned by the netdump user.
They all get passed the ip of the crashing machine as the first argument,
and each one except netdump-start gets the directory that the dump is
written into as the second argument.
netdump-start - This is called when a client connects to the server
to tell it that it has just started the netdump client. This normally
means that the machine just booted up.
netdump-crash - This is run when a client reports that it has crashed.
If it returns a non-zero value the dump request will be ignored and the
client will be told to reboot immediately
netdump-nospace - This is run when there is not enough diskspace for
the dump of the crashed machine. If this script exits with a non-zero
return value netdump-server will try once again (but only once) before
giving up the dump. If this script exits with a zero return value,
netdump-server will reboot the client without performing a dump.
netdump-reboot - This is run when netdump-server is finished with a client
and is about to tell the client to reboot itself.
