Cluster server

Shard
A Shard is a set of Services running on a cluster of physical servers.

In Video Game, a Shard is an instance of the game universe. For example, the game developers decide that a Shard handle 3000 players and if they need to host 6000 players, they run a new instance of the Shard. They just have to copy/paste a new set of physical servers to scale. There's often no interaction between Shards. Shards can also be used as a logical separation of groups based upon preferred language. For example you may run a shard for English speakers, a separate one for French and for German.

So if i run the same server configs on two servers it will create a cluster?

Is it really that simple?