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+# Allow instantiation parameters in cloud-init
+
+## Proposer
+
+- Gerardo Garcia (Telefonica)
+- Alfonso Tierno (Telefonica)
+- Francisco Javier Ramon (Telefonica)
+
+## Type
+
+**Feature**
+
+## Target MDG/TF
+
+NBI, LCM, RO
+
+## Description
+
+OSM currently provides a mechanism to pass parameters when an instantiation (of 
+NS or NSI) is triggered, so that different instances created out of the same 
+NS/Slice Package may run with slightly different initial conditions -such as 
+different IP addressing, different QoS definitions, more/less centralization, 
+etc.-, which would be modelled as variables/inputs in the Package definition. 
+Currently, two kinds of mechanisms (non-mutually exclusive) to consume those 
+instantiation parameters are available:
+
+1. Indications of VIM target for a given VNF. These are passed to RO to deploy 
+the VNFs accordingly.
+2. Initial configuration parameters. These are passed to VCA so that initial 
+configuration can be influenced by these parameters.
+
+This feature specifies a third mechanism of consumption of instantiation 
+parameters, so that some parameters might be directly mapped to initial config 
+files/templates, passed via cloud-init. This would largely simplify the initial 
+parametrization of those VNFs where some parameters might be trivially mapped 
+to fields in initial config templates. This would bring two benefits:
+
+- It would make the onboarding and parametrization of some simple/static VNFs 
+much simpler.
+- Much faster instantiation of VNFs which required complex parametrizable 
+configurations, avoiding the need of multiple/complex transactions.
+
+This mechanism should be able to coexist the other two other mechanisms, even 
+in the same VNFs, where different subsets of instantiation parameters at VNF 
+level might trigger different types of operations.
+
+## Demo or definition of done
+
+- Create a VNF Package that embeds a config template with placeholders where 
+some instantiation parameters might be directly mapped.
+- Instantiate a NS that uses such a VNF, passing the appropriate instantiation 
+parameters to be mapped to the template.
+- Check that the applied configuration corresponds to the parameters that were 
+passed via this mechanism.
+- Check whether parameters marked as mandatory are not provided. If so, an 
+error message should be issued, indicating clearly what parameter is needed in 
+which VNF.