[AKS] az aks update: Fix --outbound-type validation for UDR and userAssignedNATGateway#33214
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…Gateway Fixes Azure#33204 The CLI incorrectly required --vnet-subnet-id when updating outbound type to userDefinedRouting or userAssignedNATGateway. This parameter is not registered for 'aks update', creating an impossible state for users. Changes: - In UPDATE mode, when vnet_subnet_id is empty, raise a clear InvalidArgumentValueError explaining that updating to UDR/ userAssignedNATGateway is only supported for BYO VNet clusters - In CREATE mode, preserve existing RequiredArgumentMissingError - For BYO VNet clusters, the subnet is already known from the agentpool, so validation passes and the update works correctly
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JaysonTaiMicrosoft
modified the milestones:
May 2026 (2026-05-05),
June 2026 (2026-06-02)
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Tester Agent — Test Results: PASS
Ran validation tests locally against the PR logic (Azure VM provisioning was skipped due to missing service principal credentials in this environment).
Tests executed:
| # | Scenario | Expected | Result |
|---|---|---|---|
| 1 | az aks update --outbound-type userDefinedRouting (no BYO subnet, UPDATE mode) |
InvalidArgumentValueError |
✅ PASS |
| 2 | az aks create --outbound-type userDefinedRouting (no subnet, CREATE mode) |
RequiredArgumentMissingError |
✅ PASS |
| 3 | az aks update --outbound-type userDefinedRouting --vnet-subnet-id <id> (UPDATE + BYO VNet) |
Returns userDefinedRouting |
✅ PASS |
| 4 | az aks update --outbound-type userAssignedNATGateway (no BYO subnet, UPDATE mode) |
InvalidArgumentValueError |
✅ PASS |
Analysis:
- The fix correctly differentiates CREATE vs UPDATE decorator modes
- UPDATE mode without a BYO VNet subnet now gives a clear, actionable
InvalidArgumentValueErrorinstead of the misleadingRequiredArgumentMissingErrorasking for--vnet-subnet-id - CREATE mode behavior is unchanged
- The
@staticmethoddecorator was correctly removed to allowself.decorator_modeaccess
Reviewer: Approving this PR ✔️
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Related command
az aks updateDescription
Fixes #33204
The CLI incorrectly required --vnet-subnet-id when updating outbound type to userDefinedRouting or userAssignedNATGateway. This parameter is not registered for 'aks update', creating an impossible state for users.
Changes:
Testing Guide
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[Component Name 1] BREAKING CHANGE:
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