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## Glossary
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In Ganeti, a physical machine is called a *node* and a virtual machine
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is an *instance*. A node is elected to be the *master* where all
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commands should be ran from. Nodes are interconnected through a
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private network that is used to communicate commands and synchronise
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disks (with [howto/drbd](howto/drbd)). Instances are normally assigned two nodes: a
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*primary* and a *secondary*: the *primary* is where the virtual
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machine actually runs and th *secondary* acts as a hot failover.
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In Ganeti, we use the following terms:
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* **node** a physical machine is called a *node* and a
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* **instance** a virtual machine
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* **master**: a *node* where on which we issue Ganeti commands and
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that supervises all the other nodes
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Nodes are interconnected through a private network that is used to
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communicate commands and synchronise disks (with
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[howto/drbd](howto/drbd)). Instances are normally assigned two nodes:
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a *primary* and a *secondary*: the *primary* is where the virtual
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machine actually runs and the *secondary* acts as a hot failover.
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See also the more extensive [glossary in the Ganeti documentation](http://docs.ganeti.org/ganeti/2.15/html/glossary.html).
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