docs: clarify what we mean by the 'machines' in a node

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troymc 2016-08-08 18:45:58 +02:00
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# Nodes, Clusters & Federations # Nodes, Clusters & Federations
A **BigchainDB node** is a server or set of closely-linked servers running RethinkDB Server, BigchainDB Server, and related software. Each node is controlled by one person or organization. A **BigchainDB node** is a machine or set of closely-linked machines running RethinkDB Server, BigchainDB Server, and related software. (A "machine" might be a bare-metal server, a virtual machine or a container.) Each node is controlled by one person or organization.
A set of BigchainDB nodes can connect to each other to form a **cluster**. Each node in the cluster runs the same software. A cluster contains one logical RethinkDB datastore. A cluster may have additional servers to do things such as cluster monitoring. A set of BigchainDB nodes can connect to each other to form a **cluster**. Each node in the cluster runs the same software. A cluster contains one logical RethinkDB datastore. A cluster may have additional machines to do things such as cluster monitoring.
The people and organizations that run the nodes in a cluster belong to a **federation** (i.e. another organization). A federation must have some sort of governance structure to make decisions. If a cluster is run by a single company, then the federation is just that company. The people and organizations that run the nodes in a cluster belong to a **federation** (i.e. another organization). A federation must have some sort of governance structure to make decisions. If a cluster is run by a single company, then the federation is just that company.