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This wiki provides  documentation regarding the design, capabilities and usage of the Saltstack Extension for APP-C. Saltstack  is a  an open-source config management tool that can be used in VNF management framework that allows provide an almost cli like set of tools in a structured form. Here Saltstack Server is called as salt master and clients are called as salt minions which run as agents in the client machine, Salt uses YAML config files, organized into templates or packages called states. In the target VNF it is necessary to have a) an SSH server, b) salt minions and dependencies and d) any necessary software that is specific to the VNF to run its functions. Many actions such as configure, restart, health check can be executed on the VNF by constructing a salt-states (set of sls files) that is executed by an Saltstack server on the VNF via SSH.

The Saltstack Extension for APP-C allows  management of VNFs  that support Saltstack through the following two additions :

1. Saltstack Directed Graph : The Saltstack Directed graph is generic DG that can be used to invoke salt-states via Saltstack (and hence any APP-C action, VNF actions map to salt-states) corresponding to an LCM action.
2. An APP-C Saltstack adapter : The Saltstack adapter is an OSGI bundle in the APP-C Karaf container that interacts with the Saltstack Server . It is essentially a set of SSH calls that performs two actions, submit job request for a salt-states to be executed, and get the results of the execution (in synchronous mode).
   
3. Saltstack Directed Graph : The Saltstack Directed graph is generic DG that can be used to invoke salt-states via Saltstack (and hence any APP-C action, VNF actions map to salt-states) corresponding to an LCM action.

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Details of each of these two aspects are listed below :

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