diff --git a/rally/plugins/openstack/context/ceilometer/samples.py b/rally/plugins/openstack/context/ceilometer/samples.py
index 7c63b2c4..0c9f26af 100644
--- a/rally/plugins/openstack/context/ceilometer/samples.py
+++ b/rally/plugins/openstack/context/ceilometer/samples.py
@@ -79,7 +79,8 @@ class CeilometerSampleGenerator(context.Context):
                         "created_at": {
                             "type": "string"
                         }
-                    }
+                    },
+                    "additionalProperties": False
                 }
             },
             "batch_size": {
diff --git a/rally/plugins/openstack/context/dataplane/heat.py b/rally/plugins/openstack/context/dataplane/heat.py
index a78828df..392f1bf3 100644
--- a/rally/plugins/openstack/context/dataplane/heat.py
+++ b/rally/plugins/openstack/context/dataplane/heat.py
@@ -73,12 +73,15 @@ class HeatDataplane(context.Context):
             },
             "files": {
                 "type": "object",
+                "additionalProperties": True
             },
             "parameters": {
                 "type": "object",
+                "additionalProperties": True
             },
             "context_parameters": {
                 "type": "object",
+                "additionalProperties": True
             },
         },
         "additionalProperties": False
diff --git a/rally/plugins/openstack/context/ec2/servers.py b/rally/plugins/openstack/context/ec2/servers.py
index 6b23b5a7..454862d7 100644
--- a/rally/plugins/openstack/context/ec2/servers.py
+++ b/rally/plugins/openstack/context/ec2/servers.py
@@ -39,7 +39,8 @@ class EC2ServerGenerator(context.Context):
                     "name": {
                         "type": "string"
                     }
-                }
+                },
+                "additionalProperties": False
             },
             "flavor": {
                 "type": "object",
@@ -47,7 +48,8 @@ class EC2ServerGenerator(context.Context):
                     "name": {
                         "type": "string"
                     }
-                }
+                },
+                "additionalProperties": False
             },
             "servers_per_tenant": {
                 "type": "integer",
diff --git a/rally/plugins/openstack/context/manila/manila_share_networks.py b/rally/plugins/openstack/context/manila/manila_share_networks.py
index b5913ea0..dafa5350 100644
--- a/rally/plugins/openstack/context/manila/manila_share_networks.py
+++ b/rally/plugins/openstack/context/manila/manila_share_networks.py
@@ -70,12 +70,13 @@ class ShareNetworks(context.Context):
         "properties": {
             "use_share_networks": {
                 "type": "boolean",
-                "description": "specifies whether manila should use share "
+                "description": "Specifies whether manila should use share "
                                "networks for share creation or not."},
 
             "share_networks": {
                 "type": "object",
-                "description": SHARE_NETWORKS_ARG_DESCR
+                "description": SHARE_NETWORKS_ARG_DESCR,
+                "additionalProperties": True
             },
         },
         "additionalProperties": False
diff --git a/rally/plugins/openstack/context/monasca/metrics.py b/rally/plugins/openstack/context/monasca/metrics.py
index 6fc8d22f..ec706124 100644
--- a/rally/plugins/openstack/context/monasca/metrics.py
+++ b/rally/plugins/openstack/context/monasca/metrics.py
@@ -48,7 +48,8 @@ class MonascaMetricGenerator(context.Context):
                     "url": {
                         "type": "string"
                     }
-                }
+                },
+                "additionalProperties": False
             },
             "metrics_per_tenant": {
                 "type": "integer",
@@ -65,7 +66,8 @@ class MonascaMetricGenerator(context.Context):
                         "value_meta_value": {
                             "type": "string"
                         }
-                    }
+                    },
+                    "additionalProperties": False
                 }
             }
         },
diff --git a/rally/plugins/openstack/context/network/routers.py b/rally/plugins/openstack/context/network/routers.py
index c2d3e8f9..d5ff6d70 100644
--- a/rally/plugins/openstack/context/network/routers.py
+++ b/rally/plugins/openstack/context/network/routers.py
@@ -48,7 +48,8 @@ class Router(context.Context):
                 "properties": {
                     "network_id": {"type": "string"},
                     "enable_snat": {"type": "boolean"}
-                }
+                },
+                "additionalProperties": False
             },
             "network_id": {
                 "description": "Network ID",
@@ -62,7 +63,8 @@ class Router(context.Context):
                     "properties": {
                         "ip_address": {"type": "string"},
                         "subnet_id": {"type": "string"}
-                    }
+                    },
+                    "additionalProperties": False,
                 }
             },
             "distributed": {
diff --git a/rally/plugins/openstack/context/neutron/lbaas.py b/rally/plugins/openstack/context/neutron/lbaas.py
index 31f9cf68..8ba5efc1 100644
--- a/rally/plugins/openstack/context/neutron/lbaas.py
+++ b/rally/plugins/openstack/context/neutron/lbaas.py
@@ -32,7 +32,8 @@ class Lbaas(context.Context):
         "$schema": consts.JSON_SCHEMA,
         "properties": {
             "pool": {
-                "type": "object"
+                "type": "object",
+                "additionalProperties": True
             },
             "lbaas_version": {
                 "type": "integer",
diff --git a/rally/plugins/openstack/context/nova/servers.py b/rally/plugins/openstack/context/nova/servers.py
index 590a8d0b..975ad1c4 100755
--- a/rally/plugins/openstack/context/nova/servers.py
+++ b/rally/plugins/openstack/context/nova/servers.py
@@ -38,14 +38,16 @@ class ServerGenerator(context.Context):
                 "type": "object",
                 "properties": {
                     "name": {"type": "string"}
-                }
+                },
+                "additionalProperties": False
             },
             "flavor": {
                 "description": "Name of flavor to boot server(s) with.",
                 "type": "object",
                 "properties": {
                     "name": {"type": "string"}
-                }
+                },
+                "additionalProperties": False
             },
             "servers_per_tenant": {
                 "description": "Number of servers to boot in each Tenant.",
@@ -60,11 +62,18 @@ class ServerGenerator(context.Context):
                 "type": "array",
                 "description": "List of networks to attach to server.",
                 "items": {"oneOf": [
-                    {"type": "object",
-                     "properties": {"net-id": {"type": "string"}},
-                     "description": "Network ID in a format like OpenStack API"
-                                    " expects to see."},
-                    {"type": "string", "description": "Network ID."}]},
+                    {
+                        "type": "object",
+                        "properties": {"net-id": {"type": "string"}},
+                        "description": "Network ID in a format like OpenStack "
+                                       "API expects to see.",
+                        "additionalProperties": False
+                    },
+                    {
+                        "type": "string",
+                        "description": "Network ID."
+                    }
+                ]},
                 "minItems": 1
             }
         },
diff --git a/rally/plugins/openstack/context/sahara/sahara_cluster.py b/rally/plugins/openstack/context/sahara/sahara_cluster.py
index 3295482a..f75ec3e0 100644
--- a/rally/plugins/openstack/context/sahara/sahara_cluster.py
+++ b/rally/plugins/openstack/context/sahara/sahara_cluster.py
@@ -77,10 +77,12 @@ class SaharaCluster(context.Context):
                 }
             },
             "node_configs": {
-                "type": "object"
+                "type": "object",
+                "additionalProperties": True
             },
             "cluster_configs": {
-                "type": "object"
+                "type": "object",
+                "additionalProperties": True
             },
             "enable_anti_affinity": {
                 "type": "boolean"
diff --git a/rally/plugins/openstack/context/senlin/profiles.py b/rally/plugins/openstack/context/senlin/profiles.py
index 978fcdc3..c27c1802 100644
--- a/rally/plugins/openstack/context/senlin/profiles.py
+++ b/rally/plugins/openstack/context/senlin/profiles.py
@@ -34,6 +34,7 @@ class ProfilesGenerator(context.Context):
             },
             "properties": {
                 "type": "object",
+                "additionalProperties": True,
             }
         },
         "additionalProperties": False,
diff --git a/rally/plugins/openstack/context/vm/custom_image.py b/rally/plugins/openstack/context/vm/custom_image.py
index 2eb06660..e36d39b8 100644
--- a/rally/plugins/openstack/context/vm/custom_image.py
+++ b/rally/plugins/openstack/context/vm/custom_image.py
@@ -55,7 +55,8 @@ class BaseCustomImageGenerator(context.Context):
                     "name": {
                         "type": "string"
                     }
-                }
+                },
+                "additionalProperties": False
             },
             "flavor": {
                 "type": "object",
@@ -63,7 +64,8 @@ class BaseCustomImageGenerator(context.Context):
                     "name": {
                         "type": "string"
                     }
-                }
+                },
+                "additionalProperties": False
             },
             "username": {
                 "type": "string"
diff --git a/rally/plugins/openstack/context/watcher/audit_templates.py b/rally/plugins/openstack/context/watcher/audit_templates.py
index e53ee524..c3a7700a 100644
--- a/rally/plugins/openstack/context/watcher/audit_templates.py
+++ b/rally/plugins/openstack/context/watcher/audit_templates.py
@@ -49,7 +49,8 @@ class AuditTemplateGenerator(context.Context):
                                 "name": {
                                     "type": "string"
                                 }
-                            }
+                            },
+                            "additionalProperties": False
                         },
                         "strategy": {
                             "type": "object",
@@ -57,9 +58,11 @@ class AuditTemplateGenerator(context.Context):
                                 "name": {
                                     "type": "string"
                                 }
-                            }
+                            },
+                            "additionalProperties": False
                         },
                     },
+                    "additionalProperties": False,
                 },
             }
         },
diff --git a/tests/unit/doc/test_jsonschemas.py b/tests/unit/doc/test_jsonschemas.py
index f8b6c82c..485cca6b 100644
--- a/tests/unit/doc/test_jsonschemas.py
+++ b/tests/unit/doc/test_jsonschemas.py
@@ -13,6 +13,7 @@
 #    under the License.
 
 import copy
+import json
 
 from rally.common.plugin import plugin
 from rally import plugins
@@ -35,9 +36,10 @@ class ConfigSchemasTestCase(test.TestCase):
     def fail(self, p, schema, msg):
         super(ConfigSchemasTestCase, self).fail(
             "Config schema of plugin '%s' (%s) is invalid. %s "
-            "(Schema: %s)" % (p.get_name(),
+            "Schema: \n%s" % (p.get_name(),
                               "%s.%s" % (p.__module__, p.__name__),
-                              msg, schema))
+                              msg,
+                              json.dumps(schema, indent=3)))
 
     def _check_anyOf_or_oneOf(self, p, schema, definitions):
         if "anyOf" in schema or "oneOf" in schema:
@@ -61,6 +63,11 @@ class ConfigSchemasTestCase(test.TestCase):
         if unexpected_keys:
             self.fail(p, schema, ("Found unexpected key(s) for object type: "
                                   "%s." % ", ".join(unexpected_keys)))
+        if "additionalProperties" not in schema:
+            self.fail(p, schema,
+                      "'additionalProperties' is required field for objects. "
+                      "Specify `'additionalProperties': True` explicitly to "
+                      "accept not validated properties.")
 
         if "patternProperties" in schema:
             if "properties" in schema:
@@ -147,7 +154,7 @@ class ConfigSchemasTestCase(test.TestCase):
             pass
         elif schema == {}:
             # NOTE(andreykurilin): an empty dict means that the user can
-            #   transmit whatever he want in whatever he want format. It is
+            #   transmit whatever he wants in whatever he wants format. It is
             #   not the case which we want to support.
             self.fail(p, schema, "Empty schema is not allowed.")
         elif "$ref" in schema:
@@ -161,7 +168,7 @@ class ConfigSchemasTestCase(test.TestCase):
     @plugins.ensure_plugins_are_loaded
     def test_schema_is_valid(self):
         for p in plugin.Plugin.get_all():
-            if not hasattr(p, "CONFIG_SCHEMA"):
+            if not hasattr(p, "CONFIG_SCHEMA") or "tests.unit" in p.__module__:
                 continue
             # allow only top level definitions
             definitions = p.CONFIG_SCHEMA.get("definitions", {})