diff --git a/tempest/api_schema/compute/agents.py b/tempest/api_schema/compute/agents.py
index b04cf64..58ade10 100644
--- a/tempest/api_schema/compute/agents.py
+++ b/tempest/api_schema/compute/agents.py
@@ -22,7 +22,7 @@
                 'items': {
                     'type': 'object',
                     'properties': {
-                        'agent_id': {'type': ['integer', 'string']},
+                        'agent_id': {'type': 'integer'},
                         'hypervisor': {'type': 'string'},
                         'os': {'type': 'string'},
                         'architecture': {'type': 'string'},
diff --git a/tempest/api_schema/compute/keypairs.py b/tempest/api_schema/compute/keypairs.py
index b8f905f..2ae410c 100644
--- a/tempest/api_schema/compute/keypairs.py
+++ b/tempest/api_schema/compute/keypairs.py
@@ -49,10 +49,7 @@
                 'fingerprint': {'type': 'string'},
                 'name': {'type': 'string'},
                 'public_key': {'type': 'string'},
-                # NOTE: Now the type of 'user_id' is integer, but here
-                # allows 'string' also because we will be able to change
-                # it to 'uuid' in the future.
-                'user_id': {'type': ['integer', 'string']},
+                'user_id': {'type': 'string'},
                 'private_key': {'type': 'string'}
             },
             # When create keypair API is being called with 'Public key'
diff --git a/tempest/api_schema/compute/migrations.py b/tempest/api_schema/compute/migrations.py
index 6723869..6549272 100644
--- a/tempest/api_schema/compute/migrations.py
+++ b/tempest/api_schema/compute/migrations.py
@@ -22,10 +22,7 @@
                 'items': {
                     'type': 'object',
                     'properties': {
-                        # NOTE: Now the type of 'id' is integer, but here
-                        # allows 'string' also because we will be able to
-                        # change it to 'uuid' in the future.
-                        'id': {'type': ['integer', 'string']},
+                        'id': {'type': 'integer'},
                         'status': {'type': 'string'},
                         'instance_uuid': {'type': 'string'},
                         'source_node': {'type': 'string'},
@@ -33,12 +30,8 @@
                         'dest_node': {'type': 'string'},
                         'dest_compute': {'type': 'string'},
                         'dest_host': {'type': 'string'},
-                        'old_instance_type_id': {
-                            'type': ['integer', 'string']
-                        },
-                        'new_instance_type_id': {
-                            'type': ['integer', 'string']
-                        },
+                        'old_instance_type_id': {'type': 'integer'},
+                        'new_instance_type_id': {'type': 'integer'},
                         'created_at': {'type': 'string'},
                         'updated_at': {'type': ['string', 'null']}
                     },
diff --git a/tempest/api_schema/compute/servers.py b/tempest/api_schema/compute/servers.py
index ca1f5aa..8e2a778 100644
--- a/tempest/api_schema/compute/servers.py
+++ b/tempest/api_schema/compute/servers.py
@@ -56,13 +56,13 @@
             'server': {
                 'type': 'object',
                 'properties': {
-                    'id': {'type': ['integer', 'string']},
+                    'id': {'type': 'string'},
                     'name': {'type': 'string'},
                     'status': {'type': 'string'},
                     'image': {
                         'type': 'object',
                         'properties': {
-                            'id': {'type': ['integer', 'string']},
+                            'id': {'type': 'string'},
                             'links': parameter_types.links
                         },
                         'required': ['id', 'links']
@@ -70,7 +70,7 @@
                     'flavor': {
                         'type': 'object',
                         'properties': {
-                            'id': {'type': ['integer', 'string']},
+                            'id': {'type': 'string'},
                             'links': parameter_types.links
                         },
                         'required': ['id', 'links']
diff --git a/tempest/api_schema/compute/services.py b/tempest/api_schema/compute/services.py
index 4c58013..eaba129 100644
--- a/tempest/api_schema/compute/services.py
+++ b/tempest/api_schema/compute/services.py
@@ -22,10 +22,7 @@
                 'items': {
                     'type': 'object',
                     'properties': {
-                        # NOTE: Now the type of 'id' is integer, but here
-                        # allows 'string' also because we will be able to
-                        # change it to 'uuid' in the future.
-                        'id': {'type': ['integer', 'string']},
+                        'id': {'type': 'integer'},
                         'zone': {'type': 'string'},
                         'host': {'type': 'string'},
                         'state': {'type': 'string'},
diff --git a/tempest/api_schema/compute/v2/floating_ips.py b/tempest/api_schema/compute/v2/floating_ips.py
index 3ea6320..5bb6b94 100644
--- a/tempest/api_schema/compute/v2/floating_ips.py
+++ b/tempest/api_schema/compute/v2/floating_ips.py
@@ -27,7 +27,7 @@
                         # able to change it to 'uuid' in the future.
                         'id': {'type': ['integer', 'string']},
                         'pool': {'type': ['string', 'null']},
-                        'instance_id': {'type': ['integer', 'string', 'null']},
+                        'instance_id': {'type': ['string', 'null']},
                         'ip': {
                             'type': 'string',
                             'format': 'ip-address'
@@ -58,7 +58,7 @@
                     # 'uuid' in the future.
                     'id': {'type': ['integer', 'string']},
                     'pool': {'type': ['string', 'null']},
-                    'instance_id': {'type': ['integer', 'string', 'null']},
+                    'instance_id': {'type': ['string', 'null']},
                     'ip': {
                         'type': 'string',
                         'format': 'ip-address'
diff --git a/tempest/api_schema/compute/v2/images.py b/tempest/api_schema/compute/v2/images.py
index d121060..90737a2 100644
--- a/tempest/api_schema/compute/v2/images.py
+++ b/tempest/api_schema/compute/v2/images.py
@@ -30,10 +30,7 @@
         'server': {
             'type': 'object',
             'properties': {
-                # NOTE: Now the type of 'id' is integer, but here
-                # allows 'string' also because we will be able to
-                # change it to 'uuid' in the future.
-                'id': {'type': ['integer', 'string']},
+                'id': {'type': 'string'},
                 'links': parameter_types.links
             },
             'required': ['id', 'links']
diff --git a/tempest/api_schema/compute/v2/keypairs.py b/tempest/api_schema/compute/v2/keypairs.py
index 9a025c3..32d8cca 100644
--- a/tempest/api_schema/compute/v2/keypairs.py
+++ b/tempest/api_schema/compute/v2/keypairs.py
@@ -25,10 +25,7 @@
                     'public_key': {'type': 'string'},
                     'name': {'type': 'string'},
                     'fingerprint': {'type': 'string'},
-                    # NOTE: Now the type of 'user_id' is integer, but here
-                    # allows 'string' also because we will be able to change
-                    # it to 'uuid' in the future.
-                    'user_id': {'type': ['integer', 'string']},
+                    'user_id': {'type': 'string'},
                     'deleted': {'type': 'boolean'},
                     'created_at': {'type': 'string'},
                     'updated_at': {'type': ['string', 'null']},
diff --git a/tempest/api_schema/compute/v2/servers.py b/tempest/api_schema/compute/v2/servers.py
index 981d8f7..afcceac 100644
--- a/tempest/api_schema/compute/v2/servers.py
+++ b/tempest/api_schema/compute/v2/servers.py
@@ -25,10 +25,7 @@
             'server': {
                 'type': 'object',
                 'properties': {
-                    # NOTE: Now the type of 'id' is uuid, but here allows
-                    # 'integer' also because old OpenStack uses 'integer'
-                    # as a server id.
-                    'id': {'type': ['integer', 'string']},
+                    'id': {'type': 'string'},
                     'security_groups': {'type': 'array'},
                     'links': parameter_types.links,
                     'adminPass': {'type': 'string'},
diff --git a/tempest/api_schema/compute/v2/volumes.py b/tempest/api_schema/compute/v2/volumes.py
index 84a659c..1af951f 100644
--- a/tempest/api_schema/compute/v2/volumes.py
+++ b/tempest/api_schema/compute/v2/volumes.py
@@ -38,7 +38,7 @@
                                 'id': {'type': 'string'},
                                 'device': {'type': 'string'},
                                 'volumeId': {'type': 'string'},
-                                'serverId': {'type': ['integer', 'string']}
+                                'serverId': {'type': 'string'}
                             }
                             # NOTE- If volume is not attached to any server
                             # then, 'attachments' attributes comes as array
@@ -86,7 +86,7 @@
                                     'id': {'type': 'string'},
                                     'device': {'type': 'string'},
                                     'volumeId': {'type': 'string'},
-                                    'serverId': {'type': ['integer', 'string']}
+                                    'serverId': {'type': 'string'}
                                 }
                                 # NOTE- If volume is not attached to any server
                                 # then, 'attachments' attributes comes as array
diff --git a/tempest/api_schema/compute/v3/servers.py b/tempest/api_schema/compute/v3/servers.py
index 6716249..308f744 100644
--- a/tempest/api_schema/compute/v3/servers.py
+++ b/tempest/api_schema/compute/v3/servers.py
@@ -25,10 +25,7 @@
             'server': {
                 'type': 'object',
                 'properties': {
-                    # NOTE: Now the type of 'id' is uuid, but here allows
-                    # 'integer' also because old OpenStack uses 'integer'
-                    # as a server id.
-                    'id': {'type': ['integer', 'string']},
+                    'id': {'type': 'string'},
                     'os-security-groups:security_groups': {'type': 'array'},
                     'links': parameter_types.links,
                     'admin_password': {'type': 'string'},