{aks}: Add support for basic lb migration

src/aks-preview/HISTORY.rst

@@ -12,6 +12,10 @@ To release a new version, please select a new version number (usually plus 1 to
 Pending
 +++++++
 
+18.0.0b3
++++++++
+* Add basic lb sku migration support `az aks update --load-balancer-sku standard`
+
 18.0.0b2
 +++++++
 * Vendor new SDK and bump API version to 2025-03-02-preview.

src/aks-preview/azext_aks_preview/_help.py

@@ -816,6 +816,10 @@
         - name: --tier
           type: string
           short-summary: Specify SKU tier for managed clusters. '--tier standard' enables a standard managed cluster service with a financially backed SLA. '--tier free' changes a standard managed cluster to a free one.
+        - name: --load-balancer-sku
+          type: string
+          short-summary: Azure Load Balancer SKU selection for your cluster. only standard is accepted.
+          long-summary: Upgrade to Standard Azure Load Balancer SKU for your AKS cluster.
         - name: --load-balancer-managed-outbound-ip-count
           type: int
           short-summary: Load balancer managed outbound IP count.
@@ -1267,6 +1271,8 @@
         text: az aks update --disable-cluster-autoscaler -g MyResourceGroup -n MyManagedCluster
       - name: Update min-count or max-count for cluster autoscaler.
         text: az aks update --update-cluster-autoscaler --min-count 1 --max-count 10 -g MyResourceGroup -n MyManagedCluster
+      - name: Upgrade load balancer sku to standard
+        text: az aks update --load-balancer-sku standard -g MyResourceGroup -n MyManagedCluster
       - name: Update a kubernetes cluster with standard SKU load balancer to use two AKS created IPs for the load balancer outbound connection usage.
         text: az aks update -g MyResourceGroup -n MyManagedCluster --load-balancer-managed-outbound-ip-count 2
       - name: Update a kubernetes cluster with standard SKU load balancer to use the provided public IPs for the load balancer outbound connection usage.

src/aks-preview/azext_aks_preview/_params.py

@@ -997,6 +997,11 @@ def load_arguments(self, _):
         # managed cluster paramerters
         c.argument("disable_local_accounts", action="store_true")
         c.argument("enable_local_accounts", action="store_true")
+        c.argument(
+            "load_balancer_sku",
+            arg_type=get_enum_type([CONST_LOAD_BALANCER_SKU_STANDARD]),
+            validator=validate_load_balancer_sku,
+        )
         c.argument("load_balancer_managed_outbound_ip_count", type=int)
         c.argument(
             "load_balancer_outbound_ips", validator=validate_load_balancer_outbound_ips

src/aks-preview/azext_aks_preview/custom.py

@@ -598,6 +598,7 @@ def aks_update(
     tags=None,
     disable_local_accounts=False,
     enable_local_accounts=False,
+    load_balancer_sku=None,
     load_balancer_managed_outbound_ip_count=None,
     load_balancer_outbound_ips=None,
     load_balancer_outbound_ip_prefixes=None,

src/aks-preview/azext_aks_preview/managed_cluster_decorator.py

@@ -20,7 +20,6 @@
     CONST_AZURE_SERVICE_MESH_UPGRADE_COMMAND_START,
     CONST_AZURE_SERVICE_MESH_DEFAULT_EGRESS_NAMESPACE,
     CONST_LOAD_BALANCER_SKU_BASIC,
-    CONST_LOAD_BALANCER_SKU_STANDARD,
     CONST_MANAGED_CLUSTER_SKU_NAME_BASE,
     CONST_MANAGED_CLUSTER_SKU_NAME_AUTOMATIC,
     CONST_MANAGED_CLUSTER_SKU_TIER_FREE,
@@ -86,6 +85,7 @@
     CONST_OUTBOUND_TYPE_MANAGED_NAT_GATEWAY,
     CONST_OUTBOUND_TYPE_USER_ASSIGNED_NAT_GATEWAY,
     CONST_OUTBOUND_TYPE_USER_DEFINED_ROUTING,
+    CONST_LOAD_BALANCER_SKU_STANDARD,
     DecoratorEarlyExitException,
     DecoratorMode,
 )
@@ -347,6 +347,48 @@ def get_enable_msi_auth_for_monitoring(self) -> Union[bool, None]:
             return True
         return enable_msi_auth_for_monitoring
 
+    def _get_load_balancer_sku(self, enable_validation: bool = False) -> Union[str, None]:
+        """Internal function to obtain the value of load_balancer_sku, default value is
+        CONST_LOAD_BALANCER_SKU_STANDARD.
+
+        Note: When returning a string, it will always be lowercase.
+
+        This function supports the option of enable_validation. When enabled, it will check if load_balancer_sku equals
+        to CONST_LOAD_BALANCER_SKU_BASIC, if so, when api_server_authorized_ip_ranges is assigned or
+        enable_private_cluster is specified, raise an InvalidArgumentValueError.
+
+        :return: string or None
+        """
+        # read the original value passed by the command
+        load_balancer_sku = safe_lower(self.raw_param.get("load_balancer_sku"))
+        # try to read the property value corresponding to the parameter from the `mc` object
+        if (
+            load_balancer_sku is None and
+            self.mc and
+            self.mc.network_profile and
+            self.mc.network_profile.load_balancer_sku is not None
+        ):
+            load_balancer_sku = safe_lower(
+                self.mc.network_profile.load_balancer_sku
+            )
+        if self.decorator_mode == DecoratorMode.CREATE and load_balancer_sku is None:
+            # default value
+            load_balancer_sku = CONST_LOAD_BALANCER_SKU_STANDARD
+
+        # validation
+        if enable_validation:
+            if load_balancer_sku == CONST_LOAD_BALANCER_SKU_BASIC:
+                if self._get_api_server_authorized_ip_ranges(enable_validation=False):
+                    raise InvalidArgumentValueError(
+                        "--api-server-authorized-ip-ranges can only be used with standard load balancer"
+                    )
+                if self._get_enable_private_cluster(enable_validation=False):
+                    raise InvalidArgumentValueError(
+                        "Please use standard load balancer for private cluster"
+                    )
+
+        return load_balancer_sku
+
     def _get_disable_local_accounts(self, enable_validation: bool = False) -> bool:
         """Internal function to obtain the value of disable_local_accounts.
 
@@ -3972,6 +4014,9 @@ def update_network_profile(self, mc: ManagedCluster) -> ManagedCluster:
 
         self.update_network_plugin_settings(mc)
 
+        loadbalancer_sku = self.context.get_load_balancer_sku()
+        if loadbalancer_sku:
+            mc.network_profile.load_balancer_sku = loadbalancer_sku
         return mc
 
     def update_network_plugin_settings(self, mc: ManagedCluster) -> ManagedCluster: