1. Copy config Files 

cp /usr/share/doc/packages/heartbeat/authkeys /etc/ha.d/
cp /usr/share/doc/packages/heartbeat/ha.cf /etc/ha.d/
cp /usr/share/doc/packages/heartbeat/haresources /etc/ha.d/

2. Set authkeys

Edit /etc/ha.d/authkeys and select one of the authentication methods,
give your own passphrase. Compare with Reference, authkeys

Copy authkeys to second node

scp /etc/ha.d/authkeys power720-3.hwlab.suse.de:/etc/ha.d/

Set correct access rigths on this file on both nodes

power720-2:# chmod 600 /etc/ha.d/authkeys

power720-3:# chmod 600 /etc/ha.d/authkeys

3. Configure heartbeat

Edit /etc/ha.d/ha.cf. This is the main configuration file for
heartbeat, but NOT for the resources that will be monitored.
Reference, ha.cf

Enable the logging. 
Set your time between heartbeats. 
Set the node names. These have to be the equivalent of

uname -n

on each node. The order is not significant.
Set your heartbeat host node, this is the only setting that will be
different on the machines.

Copy ha.cf to second node

scp /etc/ha.d/ha.cf power720-3.hwlab.suse.de:/etc/ha.d/

Logon to the second node and correct the heartbeat host node.


4. Configure resources

Edit haresources, Reference haresources

Here you define the primary node, the IP address that should be provided
by the cluster and that drbd should be controlled by heartbeat.
/dev/drbd0 should be mounted as /data by heartbeat. The services
nmb, smb and nagios should be started (and subsequently stopped) by
heartbeat.

5. Start heartbeat on both nodes

power720-2:# rcheartbeat start

power720-3:# rcheartbeat start