/usr/src/linux/Documentation/networking

gcc -Wall -O -I/usr/src/linux/include ifenslave.c -o ifenslave

cp ifenslave /sbin/ifenslave

vi rc.bond

#!/bin/sh
#
        case "$1" in
          'start')
            echo "start bond0"
            #modprobe bonding mode=balance-alb miimon=100
            modprobe bonding mode=balance-rr miimon=100
            modprobe tg3
            ifconfig bond0 up
            ifenslave bond0 eth0
            ifenslave bond0 eth1
            #TODO need to be changed
            ifconfig bond0 hw ether 00:16:3e:aa:aa:aa
          ;;
          'stop')
            ifconfig bond0 down
            rmmod bonding
            rmmod tg3
          ;;
          *)
            echo "Usage: $0 {start|stop}"
          ;;
        esac

vi rc.M

before "“#Initialize the networking hardware”"

# If script rc.bond is executeable then start it
if [ -x /etc/rc.d/rc.bond ]; then
  . /etc/rc.d/rc.bond start
fi

vi rc.inet1.conf

And add these lines to it before the default gateway gets assigned:
IFNAME[4]="bond0"
IPADDR[4]="XXX.XX.XX.XX"
NETMASK[4]="255.255.255.0"
USE_DHCP[4]=""
DHCP_HOSTNAME[4]=""
cat /proc/net/bonding/bond0
DRBD
KERNEL 2.6
Device Drivers,Connector - unified userspace <-> kernelspace linker
modprobe cn
download http://oss.linbit.com/drbd/
make; make install
/etc/drbd.conf



global {
    usage-count yes;
}

common {
  syncer { rate 10M; }
}

resource r0 {

  protocol C;

  handlers {
    pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
    pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
    local-io-error "/usr/lib/drbd/notify-local-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";
    outdate-peer "/usr/lib/heartbeat/drbd-peer-outdater -t 5";
  }

  startup {
    wfc-timeout  5;
    degr-wfc-timeout 120;    # 2 minutes.
    outdated-wfc-timeout 2;  # 2 seconds.
  }

  disk {
    on-io-error   detach;
  }

  net {
    max-buffers     8192;
    cram-hmac-alg "sha1";
    shared-secret "hieuvpn";
    after-sb-0pri discard-least-changes;
    after-sb-1pri discard-secondary;
    after-sb-2pri violently-as0p;
    rr-conflict disconnect;
  }

  syncer {
    rate 10M;
    al-extents 257;
  }

  on drdb-one {
    device    /dev/drbd0;
    disk      /dev/hda3;
    address   10.10.50.26:7788;
    meta-disk internal;
  }

  on drdb-two {
    device    /dev/drbd0;
    disk      /dev/hda3;
    address   10.10.50.27:7788;
    meta-disk internal;
  }

}




resource r1 {

  protocol C;

  handlers {
    pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
    pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";
    local-io-error "/usr/lib/drbd/notify-local-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";
    outdate-peer "/usr/lib/heartbeat/drbd-peer-outdater -t 5";
  }

  startup {
    wfc-timeout  5;
    degr-wfc-timeout 120;    # 2 minutes.
    outdated-wfc-timeout 2;  # 2 seconds.
  }

  disk {
    on-io-error   detach;
  }

  net {
    max-buffers     8192;

    cram-hmac-alg "sha1";
    shared-secret "hieuvpn";

    after-sb-0pri discard-least-changes;

    after-sb-1pri discard-secondary;
    after-sb-2pri violently-as0p;

    rr-conflict disconnect;

  }

  syncer {
    rate 10M;

    al-extents 257;

  }

  on drdb-one {
    device    /dev/drbd1;
    disk      /dev/hdb;
    address   10.10.50.26:7790;
    meta-disk internal;
  }

  on drdb-two {
    device    /dev/drbd1;
    disk      /dev/hdb;
    address   10.10.50.27:7790;
    meta-disk internal;
  }

}


Before starting the primary node, you should create the metadata for the devices:
root-shell> drbdadm create-md all
root-shell> /etc/init.d/drbd start
root-shell> drbdadm -- --overwrite-data-of-peer primary all
root-shell> mkfs.ext3 /dev/drbd0
root-shell> mount /dev/drbd0 /mnt/drbd
To set up a secondary node:

Copy the /etc/drbd.conf file from your primary node to your secondary node.
root-shell> drbdadm create-md all
root-shell> /etc/init.d/drbd start

cat /proc/drbd
root-shell> drbdadm primary all
root-shell> drbdadm secondary all
root-shell> drbdadm disconnect all
root-shell> drbdadm connect all
if split brain - run this on failed node
drbdadm -- --discard-my-data connect all
(forcing by drbdadm invalidate all )
and do connect on order side
HA
download http://www.slackware.com/~alien/slackbuilds/libnet/pkg/11.0/libnet-1.1.2.1-i486-1.tgz
download http://hg.linux-ha.org/lha-2.1/archive/STABLE-2.1.4.tar.bz2
tar -jxvf heartbeat.tar.bz2
./ConfigureMe configure
make; make install

vi ha.cf

logfacility local0
keepalive 500ms
deadtime 10
warntime 5
initdead 30
mcast bond0 225.0.0.1 694 2 0
auto_failback off
node drdb-one
node drdb-two
ping 10.10.50.254 10.10.50.50
respawn hacluster /usr/lib/heartbeat/ipfail
apiauth ipfail gid=haclient uid=hacluster
deadping 5

vi haresources
drdb-two drbddisk Filesystem::/dev/drbd0::/raid1::ext3 mysql 10.10.50.28

vi resource.d/mysql.resource
#!/bin/bash
#
# This script is inteded to be used as resource script by heartbeat
#
# Mar 2006 by Monty Taylor
#
###
. /etc/ha.d/shellfuncs
case "$1" in
    start)
        res=`/etc/init.d/mysql start`
        ret=$?
        ha_log $res
        exit $ret
        ;;
    stop)
        res=`/etc/init.d/mysql stop`
        ret=$?
        ha_log $res
        exit $ret
        ;;
    status)
        if [ `ps -ef | grep '[m]ysqld'` ] ; then
           echo "running"
        else
           echo "stopped"
        fi
        ;;
    *)
        echo "Usage: mysql {start|stop|status}"
        exit 1
        ;;
esac
exit 0