Reference:
http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html
Assumptions:

Server1 IP: 10.1.1.1
Server2 IP: 10.1.1.2
We will completely replicate all databases
Servers are not in production yet. If they are – be careful when rsyncing data

Notes:

This setup can be used in HA environments, provided that only one of the servers is used for writes (INSERTs, UPDATEs, DELETEs) at a given moment
In case one of the servers crashes, [...]

People want their servers, and of course the projects that are running on them, to be available all the time, and to bring maximum revenue at the same time.
In a real-life situation, it is more than clear that pure 100% availability is impossible to achieve, especially if a single hardware device is involved. There can [...]