diff --git a/accounts/tests.py b/accounts/tests.py
index 95d7840..06cd182 100644
--- a/accounts/tests.py
+++ b/accounts/tests.py
@@ -77,7 +77,9 @@ class LoginTest(TestCase):
         Tests if login template renders
         """
         resp = self.client.get(reverse("accounts.login"))
-        self.assertEqual(b"A free forge ecosystem for free developers" in resp.content, True)
+        self.assertEqual(
+            b"A free forge ecosystem for free developers" in resp.content, True
+        )
 
     def test_login_works(self):
         """
@@ -234,7 +236,9 @@ class RegistrationTest(TestCase):
         Tests if register template renders
         """
         resp = self.client.get(reverse("accounts.register"))
-        self.assertEqual(b"A free forge ecosystem for free developers." in resp.content, True)
+        self.assertEqual(
+            b"A free forge ecosystem for free developers." in resp.content, True
+        )
 
     def test_register_works(self):
         """
diff --git a/dash/tests.py b/dash/tests.py
index 899adea..52a9c91 100644
--- a/dash/tests.py
+++ b/dash/tests.py
@@ -30,6 +30,7 @@ from payments import get_payment_model, RedirectNeeded, PaymentStatus
 from accounts.tests import login_util, register_util
 
 from .models import InstanceConfiguration, Instance
+from .utils import create_instance, VmErrors, VmException
 
 
 def create_configurations(t: TestCase):
@@ -197,6 +198,27 @@ class CreateInstance(TestCase):
         register_util(t=self, username="createinstance_user")
         create_configurations(t=self)
 
+    @override_settings(
+        HOSTEA=infra_custom_config(test_name="test_create_instance_util")
+    )
+    def test_create_instance_util(self):
+        vm_name = "test_create_instance_renders"
+        configuration = self.instance_config[0].name
+
+        with self.assertRaises(VmException):
+            create_instance(
+                vm_name="12345452131324234234234234",
+                configuration_name=configuration,
+                user=self.user,
+            )
+
+        with self.assertRaises(VmException):
+            create_instance(
+                vm_name="122342$#34234",
+                configuration_name=configuration,
+                user=self.user,
+            )
+
     @override_settings(
         HOSTEA=infra_custom_config(test_name="test_create_instance_renders")
     )
diff --git a/dash/utils.py b/dash/utils.py
index ac3d7b3..3ba5208 100644
--- a/dash/utils.py
+++ b/dash/utils.py
@@ -23,6 +23,8 @@ from .models import Instance, InstanceConfiguration
 @unique
 class VmErrors(Enum):
     NAME_EXISTS = "Instance name exists, please try again with a different name"
+    ILLEGAL_NAME = "Only alphanumeric characters are allowed in instance name"
+    NAME_TOO_LONG = "Instance name must be less than 20 characters"
     NO_CONFIG = "Configuration doesn't exist, please try again."
 
     def __str__(self) -> str:
@@ -46,6 +48,11 @@ def create_instance(vm_name: str, configuration_name: str, user: User) -> Instan
     Create instance view
     """
 
+    if len(vm_name) > 20:
+        raise VmException(code=VmErrors.NAME_TOO_LONG)
+    if not str.isalnum(vm_name):
+        raise VmException(code=VmErrors.ILLEGAL_NAME)
+
     if Instance.objects.filter(name=vm_name).exists():
         raise VmException(code=VmErrors.NAME_EXISTS)
 
diff --git a/dash/views.py b/dash/views.py
index 383a072..28be20d 100644
--- a/dash/views.py
+++ b/dash/views.py
@@ -89,10 +89,7 @@ def create_instance(request):
         return redirect(reverse("billing.invoice.generate", args=(instance.name,)))
     except VmException as e:
         ctx = get_ctx()
-        if e.code == VmErrors.NAME_EXISTS:
-            reason = ("Instance name exists, please try again with a different name",)
-        elif e.code == VmErrors.NO_CONFIG:
-            reason = "Configuration doesn't exist, please try again."
+        reason = e.error
 
         ctx["error"] = {
             "title": "Can't create instance",