diff --git a/.gitignore b/.gitignore
index 6168b23..60489fa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .vscode/
+.idea/
 
 # Byte-compiled / optimized / DLL files
 __pycache__/
diff --git a/datacrunch/instances/instances.py b/datacrunch/instances/instances.py
index e2d20b9..2b089cd 100644
--- a/datacrunch/instances/instances.py
+++ b/datacrunch/instances/instances.py
@@ -321,9 +321,9 @@ def get_by_id(self, id: str) -> Instance:
     def create(self,
                instance_type: str,
                image: str,
-               ssh_key_ids: list,
                hostname: str,
                description: str,
+               ssh_key_ids: list = [],
                location: str = "FIN1",
                startup_script_id: str = None,
                volumes: List[Dict] = None) -> Instance:
diff --git a/datacrunch/volumes/volumes.py b/datacrunch/volumes/volumes.py
index f3b01da..0ff768c 100644
--- a/datacrunch/volumes/volumes.py
+++ b/datacrunch/volumes/volumes.py
@@ -18,6 +18,7 @@ def __init__(self,
                  target: str = None,
                  location: str = "FIN1",
                  instance_id: str = None,
+                 ssh_key_ids: List[str] = [],
                  ) -> None:
         """Initialize the volume object
 
@@ -41,6 +42,8 @@ def __init__(self,
         :type location: str, optional
         :param instance_id: the instance id the volume is attached to, None if detached
         :type instance_id: str
+        :param ssh_key_ids: list of ssh keys ids
+        :type ssh_key_ids: List[str]
         """
 
         self._id = id
@@ -53,6 +56,7 @@ def __init__(self,
         self._target = target
         self._location = location
         self._instance_id = instance_id
+        self._ssh_key_ids = ssh_key_ids
 
     @property
     def id(self) -> str:
@@ -144,6 +148,14 @@ def instance_id(self) -> Optional[str]:
         """
         return self._instance_id
 
+    @property
+    def ssh_key_ids(self) -> List[str]:
+        """Get the SSH key IDs of the instance
+
+        :return: SSH key IDs
+        :rtype: List[str]
+        """
+        return self._ssh_key_ids
 
 class VolumesService:
     """A service for interacting with the volumes endpoint"""
@@ -172,6 +184,7 @@ def get(self, status: str = None) -> List[Volume]:
             target=volume_dict['target'] if 'target' in volume_dict else None,
             location=volume_dict['location'],
             instance_id=volume_dict['instance_id'] if 'instance_id' in volume_dict else None,
+            ssh_key_ids=volume_dict['ssh_key_ids'] if 'ssh_key_ids' in volume_dict else [],
         ), volumes_dict))
         return volumes
 
@@ -196,6 +209,7 @@ def get_by_id(self, id: str) -> Volume:
             target=volume_dict['target'] if 'target' in volume_dict else None,
             location=volume_dict['location'],
             instance_id=volume_dict['instance_id'] if 'instance_id' in volume_dict else None,
+            ssh_key_ids=volume_dict['ssh_key_ids'] if 'ssh_key_ids' in volume_dict else [],
         )
         return volume
 
diff --git a/tests/unit_tests/instances/test_instances.py b/tests/unit_tests/instances/test_instances.py
index 8247fc4..367b20d 100644
--- a/tests/unit_tests/instances/test_instances.py
+++ b/tests/unit_tests/instances/test_instances.py
@@ -259,6 +259,54 @@ def test_create_instance_successful(self, instances_service, endpoint):
         assert responses.assert_call_count(endpoint, 1) is True
         assert responses.assert_call_count(url, 1) is True
 
+    def test_create_instance_attached_os_volume_successful(self, instances_service, endpoint):
+        # arrange - add response mock
+        # create instance
+        responses.add(
+            responses.POST,
+            endpoint,
+            body=INSTANCE_ID,
+            status=200
+        )
+        # get instance by id
+        url = endpoint + '/' + INSTANCE_ID
+        responses.add(
+            responses.GET,
+            url,
+            json=PAYLOAD[0],
+            status=200
+        )
+
+        # act
+        instance = instances_service.create(
+            instance_type=INSTANCE_TYPE,
+            image=OS_VOLUME_ID,
+            hostname=INSTANCE_HOSTNAME,
+            description=INSTANCE_DESCRIPTION,
+        )
+
+        # assert
+        assert type(instance) == Instance
+        assert instance.id == INSTANCE_ID
+        assert instance.ssh_key_ids == [SSH_KEY_ID]
+        assert instance.status == INSTANCE_STATUS
+        assert instance.image == INSTANCE_IMAGE
+        assert instance.instance_type == INSTANCE_TYPE
+        assert instance.price_per_hour == INSTANCE_PRICE_PER_HOUR
+        assert instance.location == INSTANCE_LOCATION
+        assert instance.description == INSTANCE_DESCRIPTION
+        assert instance.hostname == INSTANCE_HOSTNAME
+        assert instance.ip == INSTANCE_IP
+        assert instance.created_at == INSTANCE_CREATED_AT
+        assert instance.os_volume_id == OS_VOLUME_ID
+        assert type(instance.cpu) == dict
+        assert type(instance.gpu) == dict
+        assert type(instance.memory) == dict
+        assert type(instance.gpu_memory) == dict
+        assert type(instance.storage) == dict
+        assert responses.assert_call_count(endpoint, 1) is True
+        assert responses.assert_call_count(url, 1) is True
+
     def test_create_instance_failed(self, instances_service, endpoint):
         # arrange - add response mock
         responses.add(
diff --git a/tests/unit_tests/volumes/test_volumes.py b/tests/unit_tests/volumes/test_volumes.py
index a81405b..0e0d5af 100644
--- a/tests/unit_tests/volumes/test_volumes.py
+++ b/tests/unit_tests/volumes/test_volumes.py
@@ -14,6 +14,7 @@
 NVME = "NVMe"
 HDD = "HDD"
 TARGET_VDA = "vda"
+SSH_KEY_ID = '12345dc1-a5d2-4972-ae4e-d429115d055b'
 
 NVME_VOL_ID = "cf995e26-ce69-4149-84a3-cdd1e100670f"
 NVME_VOL_STATUS = VolumeStatus.ATTACHED
@@ -21,6 +22,7 @@
 NVME_VOL_SIZE = 50
 NVME_VOL_CREATED_AT = "2021-06-02T12:56:49.582Z"
 
+
 HDD_VOL_ID = "ea4edc62-9838-4b7c-bd5b-862f2efec675"
 HDD_VOL_STATUS = VolumeStatus.DETACHED
 HDD_VOL_NAME = "Volume-iHdL4ysR"
@@ -37,7 +39,8 @@
     "location": FIN1,
     "is_os_volume": True,
     "created_at": NVME_VOL_CREATED_AT,
-    "target": TARGET_VDA
+    "target": TARGET_VDA,
+    "ssh_key_ids": SSH_KEY_ID
 }
 
 HDD_VOLUME = {
@@ -50,7 +53,8 @@
     "location": FIN1,
     "is_os_volume": False,
     "created_at": HDD_VOL_CREATED_AT,
-    "target": None
+    "target": None,
+    "ssh_key_ids": []
 }
 
 PAYLOAD = [NVME_VOLUME, HDD_VOLUME]
@@ -94,6 +98,7 @@ def test_get_instances(self, volumes_service, endpoint):
         assert volume_nvme.is_os_volume
         assert volume_nvme.created_at == NVME_VOL_CREATED_AT
         assert volume_nvme.target == TARGET_VDA
+        assert volume_nvme.ssh_key_ids == SSH_KEY_ID
 
         assert volume_hdd.id == HDD_VOL_ID
         assert volume_hdd.status == HDD_VOL_STATUS
@@ -105,6 +110,7 @@ def test_get_instances(self, volumes_service, endpoint):
         assert volume_hdd.is_os_volume is False
         assert volume_hdd.created_at == HDD_VOL_CREATED_AT
         assert volume_hdd.target is None
+        assert volume_hdd.ssh_key_ids == []
 
     def test_get_volumes_by_status_successful(self, volumes_service, endpoint):
         # arrange - add response mock