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diff --git a/puppet/services/README.rst b/puppet/services/README.rst
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+++ b/puppet/services/README.rst
@@ -16,6 +16,39 @@ Each service may define its own input parameters and defaults.
Operators will use the parameter_defaults section of any Heat
environment to set per service parameters.
+Apart from sevice specific inputs, there are few default parameters for all
+the services. Following are the list of default parameters:
+
+ * ServiceNetMap: Mapping of service_name -> network name. Default mappings
+ for service to network names are defined in
+ ../network/service_net_map.j2.yaml, which may be overridden via
+ ServiceNetMap values added to a user environment file via
+ parameter_defaults.
+
+ * EndpointMap: Mapping of service endpoint -> protocol. Contains a mapping of
+ endpoint data generated for all services, based on the data included in
+ ../network/endpoints/endpoint_data.yaml.
+
+ * DefaultPasswords: Mapping of service -> default password. Used to pass some
+ passwords from the parent templates, this is a legacy interface and should
+ not be used by new services.
+
+ * RoleName: Name of the role on which this service is deployed. A service can
+ be deployed in multiple roles. This is an internal parameter (should not be
+ set via environment file), which is fetched from the name attribute of the
+ roles_data.yaml template.
+
+ * RoleParameters: Parameter specific to a role on which the service is
+ applied. Using the format "<RoleName>Parameters" in the parameter_defaults
+ of user environment file, parameters can be provided for a specific role.
+ For example, in order to provide a parameter specific to "Compute" role,
+ below is the format::
+
+ parameter_defaults:
+ ComputeParameters:
+ Param1: value
+
+
Config Settings
---------------