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+# [Cloud-init Support](https://osm.etsi.org/gerrit/#/c/168/) #
+
+## Purpose ##
+This document describes the functional specification for the
+cloud-init support feature within the SO Module.
+
+## Impacted Modules ##
+SO, RO, VCA
+
+## Data Model Changes ##
+The network service descriptor will allow the ability to specify ssh-keys and users,
+
+container nsd-catalog {
+  container nsd {
+    list key-pair {
+      key "name";
+      description "Used to configure the list of public keys to be injected as part
+                   of ns instantiation";
+      leaf name {
+        description "Name of this key pair";
+        type string;
+      }
+
+      leaf key {
+        description "Key associated with this key pair";
+        type string;
+      }
+    }
+    list user {
+      key "name";
+
+      description "List of users to be added through cloud-config";
+      leaf name {
+        description "Name of the user ";
+        type string;
+      }
+      leaf gecos {
+        description "The user name's real name";
+        type string;
+      }
+      leaf passwd {
+        description "The user password";
+        type string;
+      }
+    }
+  }
+}
+
+The ns-instance-config node will be modified to add  the following grouping,
+
+  grouping cloud-config {
+    description "List of cloud config parameters";
+
+    list ssh-authorized-key {
+      key "key-pair-ref";
+
+      description "List of authorized ssh keys as part of cloud-config";
+
+      leaf key-pair-ref {
+        description "A reference to the key pair entry in the global key pair table";
+        type leafref {
+          path "/nsr:key-pair/nsr:name";
+        }
+      }
+    }
+    list user {
+      key "name";
+
+      description "List of users to be added through cloud-config";
+      leaf name {
+        description "Name of the user ";
+        type string;
+      }
+      leaf gecos {
+        description "The user name's real name";
+        type string;
+      }
+      leaf passwd {
+        description "The user password";
+        type string;
+      }
+    }
+  }
+
+
+A top level node will be introduced in nsr data model that includes the ssh keys. The cloud-config
+will  refer to the key-pairs in this list.
+
+  list key-pair {
+    key "name";
+    description "Used to configure the list of public keys to be injected as part
+                 of ns instantiation";
+    leaf name {
+      description "Name of this key pair";
+      type string;
+    }
+
+    leaf key {
+      description "Key associated with this key pair";
+      type string;
+    }
+  }
+
+
+## Overview ##
+This cloud-init support will add the ability to declaratively specify authorized
+ssh keys(user specified and OSM generated) and user name/passwords through cloud-init.
+
+## Feature description ##
+Release1 will provide the ability to declaratively specify a list of  authorized
+ssh keys and user-name/passwords at the time of Instantiation or in the NS descriptor
+which will be passed from UI to SO to RO.
+
+If the keys/user are specified in descriptor, and if they are specified at the time of instantiation
+they will be merged  and used for instantiation.
+
+In addition to the user-specified ssh-keys the SO will also generate an
+additional "osm ssh keys" which will passed to both RO and VCA.
+
+
+## Inter-Module Dependencies ##
+The RO Module Northbound APIs  need to be enhanced to be able to pass user_data argument and osm key.
+SO need to pass the generated OSM keys VCA.
+
+## Risks ##
+No significant risks other than the inter-module dependencies.
+
+## Assumptions ##
+
+ - It is assumed that the support for the cloud-init is limited to user-name/password
+   and ssh-keys at the NS level and that the same set of keys will be included in all the
+   VDUs and all VNFs within the NS. Additional parameters will be added on a need-basis in
+   future releases
+ - There will not be support to add these keys/user a the VNF level
+   The keys/users will be taken as an input at the time of instantiation.
+ - Will maintain the support for user-data at the VDU level - If the user-data
+   is specified at the VDU level, the inputs from the NS instantiation will be merged
+   to the VDU level for  each VDU in the NS.
+- There will not be support for these scripts in the NSD.
+  It will be handled as an input in ns-instance-config as part of the parameters during instantiation.
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