# Master Tops System

In 0.10.4 the external_nodes system was upgraded to allow for modular subsystems to be used to generate the top file data for a highstate run on the master.

The old external_nodes option still works, but will be removed in the future in favor of the new master_tops option which uses the modular system instead. The master tops system contains a number of subsystems that are loaded via the Salt loader interfaces like modules, states, returners, runners, etc.

Using the new master_tops option is simple:

    master_tops:
      ext_nodes: cobbler-external-nodes

for Cobbler or:

    master_tops:
      reclass:
        inventory_base_uri: /etc/reclass
        classes_uri: roles

for Reclass.

Current Salt release: 0.17.1

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