Netconsole

Netconsole with UDP

• Configure netconsole for 2.4 redhat kernel (redhat 9.0)
  • 1) build the 2.4 redhat kernel with netconsole patch (in rh-2.4 series), make sure build with NETCONSOLE option.
  • 2) bootup the netconsole machine with this kernel, make sure netdump rpm is installed in this machine.
  • 3) edit /etc/sysconfig/netdump of this machine just like
    • LOCALPORT=6666
    • DEV=eth0
    • NETDUMPADDR=192.168.1.223 #remote server machine (host)
    • NETDUMPPORT=6666
    • NETDUMPMACADDR=00:08:74:96:6D:9B #remote server eth address
    • IDLETIMEOUT=100
  • 4) add a user accout named netdump in your host machine, then start netdump service in that netconsole machine.
  • 5) netconsole has been setup.
• Configure netconsole in 2.6 kernel
  • 1) add this line "netconsole=[src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]" in your boot command line.
  • 2) bootup the netconsole machine.
  • 3) 2.6 netconsole has been setup.
• Configure conman over netconsole, download conman from ftp://www.clusterfs.com/pub/conman
  • 1) edit your /etc/conman.conf, make sure you have set SERVER logdir, SERVER logfile, SERVER port,

               * add following line in /etc/conman.conf
                    * NETCONSOLE name="netconsole" dev="client1_ip_address:client1_port" (clientX is netconsole machine)
                    * NETCONSOLE1 name="netconsole" dev="client2_ip_address:client2_port"
                    * ............
        * 2) start conmand server conmand
        * 3) start conman netconsole with conman -d conmand_server_ip:conmand_server_port  NETCONSOLEx
        * 4) Input sysrq command (& + S + sysrq_command) over conman netconsole, you will get the result in conman netconsole

There is a netconsole patch available that supports kernel level network logging over UDP. More information and a link to the kernel patches can be found at: [1].

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• LinuxDebugging