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I’d like to have 20 different Amazon EC2 instances that read and write from the same shared location. Is it at all possible?
Also, is it possible to have an instance of MySQL that will be accessible from all 20 Amazon EC2 instances?
You could use Amazon’s RDS which offers a managed MySql service which all your instances could access. Otherwise yes of course it is possible to have a single MySql instance running which all your other instances can access in which case you will need to configure MySql to allow remote connections and open the EC2 port (3306 by default) on the database server.