Returning data to the master
Salt's architecture is based on the publish-subscribe pattern, known colloquially as pub/sub. In this design, one or more clients subscribe to a message queue. When a message is published to the queue, any current subscribers receive a copy, which they usually process in some way.
Salt in fact makes use of two message queues, both of which are managed by the Master. The first is used by the Master to publish commands to its Minions. Each Minion can see the messages published to this queue, but they will only react to them if the Minions are included in the target. A message targeted to '*' will be processed by all Minions that are connected, whereas one targeted to 192.168.0.0/16 using the -s command-line option will ...
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