{AKS} az aks update: Fix the bug affecting VMAS to VMS migration (#8997)

Author: FumingZhang

src/aks-preview/HISTORY.rst

@@ -11,22 +11,23 @@ To release a new version, please select a new version number (usually plus 1 to
 
 Pending
 +++++++
-* Add support for `ManagedSystem` Agent Pool Mode.
 
-18.0.0b19
+18.0.0b20
 +++++++
-- Add `--localdns-config` to `az aks nodepool add` and to `az aks nodepool update` to support configuring a local DNS profile for agent pools.
+* Fix the bug affecting VMAS to VMS migration in the `az aks update` command using the `--migrate-vmas-to-vms` option.
 
+18.0.0b19
++++++++
+* Add support for `ManagedSystem` Agent Pool Mode.
+* Add `--localdns-config` to `az aks nodepool add` and to `az aks nodepool update` to support configuring a local DNS profile for agent pools.
 
 18.0.0b18
 +++++++
 * Add validation error when neither --location or --cluster and --resource-group-name are specified for az extension type list or az extension type version list
 
-
-
 18.0.0b17
 +++++++
-* Remove `__import__('pkg_resources').declare_namespace(__name__)` from `vendored_sdks/__init__.py`` to fix the namespace package issue.
+* Remove `__import__('pkg_resources').declare_namespace(__name__)` from `vendored_sdks/__init__.py` to fix the namespace package issue.
 
 18.0.0b16
 +++++++

src/aks-preview/azext_aks_preview/managed_cluster_decorator.py

@@ -5384,7 +5384,10 @@ def update_vmas_to_vms(self, mc: ManagedCluster) -> ManagedCluster:
             if not self.context.get_yes() and not prompt_y_n(msg, default="n"):
                 raise DecoratorEarlyExitException()
             # Ensure we have valid vmas AP
-            if len(mc.agent_pool_profiles) == 1 and mc.agent_pool_profiles[0].type == CONST_AVAILABILITY_SET:
+            if len(mc.agent_pool_profiles) == 1 and mc.agent_pool_profiles[0].type in (
+                CONST_AVAILABILITY_SET,
+                CONST_VIRTUAL_MACHINES,
+            ):
                 mc.agent_pool_profiles[0].type = CONST_VIRTUAL_MACHINES
             else:
                 raise CLIError('This is not a valid VMAS cluster, we cannot proceed with the migration.')

src/aks-preview/setup.py

@@ -9,7 +9,7 @@
 
 from setuptools import setup, find_packages
 
-VERSION = "18.0.0b19"
+VERSION = "18.0.0b20"
 
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",