getmoto · lukaalba · Jun 13, 2025 · Jun 13, 2025 · Jun 16, 2025 · Jun 16, 2025
diff --git a/moto/rds/exceptions.py b/moto/rds/exceptions.py
@@ -297,3 +297,35 @@ def __init__(self, db_proxy_identifier: str):
             "DBProxyNotFoundFault",
             f"The specified proxy name {db_proxy_identifier} doesn't correspond to a proxy owned by your Amazon Web Services account in the specified Amazon Web Services Region.",
         )
+
+
+class BlueGreenDeploymentAlreadyExistsFault(RDSClientError):
+    def __init__(self, bg_name: str):
+        super().__init__(
+            "BlueGreenDeploymentAlreadyExistsFault",
+            f"A blue/green deployment with the specified name {bg_name} already exists.",
+        )
+
+
+class BlueGreenDeploymentNotFoundFault(RDSClientError):
+    def __init__(self, bg_identifier: str):
+        super().__init__(
+            "BlueGreenDeploymentNotFoundFault",
+            f"BlueGreenDeploymentIdentifier {bg_identifier} doesn't refer to an existing blue/green deployment.",
+        )
+
+
+class InvalidBlueGreenDeploymentStateFault(RDSClientError):
+    def __init__(self, bg_identifier: str):
+        super().__init__(
+            "InvalidBlueGreenDeploymentStateFault",
+            f"The blue/green deployment {bg_identifier} can't be switched over or deleted because there is an invalid configuration in the green environment.",
+        )
+
+
+class SourceDatabaseNotSupportedFault(RDSClientError):
+    def __init__(self, source_arn: str):
+        super().__init__(
+            "SourceDatabaseNotSupportedFault",
+            f"The source DB instance {source_arn} isn't supported for a blue/green deployment.",
+        )