clear up ganeti glossary a little

howto/ganeti.md

@@ -26,13 +26,18 @@ To exit, use `^]` -- that is, Control-<Closing Bracket>.
 
 ## Glossary
 
-In Ganeti, a physical machine is called a *node* and a virtual machine
-is an *instance*. A node is elected to be the *master* where all
-commands should be ran from. Nodes are interconnected through a
-private network that is used to communicate commands and synchronise
-disks (with [howto/drbd](howto/drbd)). Instances are normally assigned two nodes: a
-*primary* and a *secondary*: the *primary* is where the virtual
-machine actually runs and th *secondary* acts as a hot failover.
+In Ganeti, we use the following terms:
+
+ * **node** a physical machine is called a *node* and a
+ * **instance** a virtual machine
+ * **master**: a *node* where on which we issue Ganeti commands and
+   that supervises all the other nodes
+
+Nodes are interconnected through a private network that is used to
+communicate commands and synchronise disks (with
+[howto/drbd](howto/drbd)). Instances are normally assigned two nodes:
+a *primary* and a *secondary*: the *primary* is where the virtual
+machine actually runs and the *secondary* acts as a hot failover.
 
 See also the more extensive [glossary in the Ganeti documentation](http://docs.ganeti.org/ganeti/2.15/html/glossary.html).