I have a mysql master database with an slave. I want to change the master server. Downtime it is not a problem, however, I will try to reduce downtime.

My servers, for the sake of this example will be named: master, future-master, slave.

For that, I've found this:

http://plusbryan.com/mysql-replication-without-downtime

This explains how to change the master of a running mysql database by the mechanism of:

1. Create a new slave wihtout downtime
2. Stop the current master and start a new master (the last slave)

https://dev.mysql.com/doc/refman/5.0/en/replication-solutions-switch.html