EC2 and setting up MYSQL Replication
on Amazon system you can use following steps to setup replication for MySQL


Choose a low/off production window
Note Master co-ordinate using show master status
You may consider using flush tables with read-lock, just to make sure you are sure that your co-ordinates doesn't change while you are creating snap shot
take snap shot and restore
Change server-id and relay log and issue change master


Hope it helps