Breaking changes of Network API version 2020-08-01

[feiskyer]

Refer https://azure.microsoft.com/en-us/updates/zone-behavior-change/:

With Network API version 2020-08-01, zone behavior for Standard SKU resources (Azure Load Balancer and Public IP addresses) will be updated such that:

• when no zone is specified, a non-zonal resource is created
• when a single zone is specified, a zonal resource is created
• when multiple zones are specified in a region with Availability Zones, a zone-redundant resource is created

A zone-redundant resource can only be created in regions where Availability Zones are supported.

Previously, when no zone was specified, a zone-redundant resource was created. No changes will be made to existing Public IP or Standard Load Balancer resources with previous API versions.

We need to check how to ensure the expected AZ (e.g. from aks-engine and AKS) are set on SLB/PIP when upgrading network API version to 2020-08-01.

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[feiskyer]

For checking whether a region supports the availability zone or not, provider LIST API (https://docs.microsoft.com/en-us/rest/api/resources/providers/list) could be used. Here is an example:

# query the zone mappings for virtualMachines
GET /subscriptions/<subscription-id>/providers?api-version=2020-06-01 | \
        jq '.value[] | select (.id == "/subscriptions/<subscription-id>/providers/Microsoft.Compute")' | \
        jq '.resourceTypes[] | select(.resourceType=="virtualMachines")' | \
        jq '.zoneMappings'

[
  {
    "location": "East US 2",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Central US",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "West Europe",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "East US 2 EUAP",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Central US EUAP",
    "zones": [
      "1",
      "2"
    ]
  },
  {
    "location": "France Central",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Southeast Asia",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "West US 2",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "North Europe",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "East US",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "UK South",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Japan East",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Australia East",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "South Africa North",
    "zones": []
  },
  {
    "location": "South Central US",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Canada Central",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Germany West Central",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Brazil South",
    "zones": [
      "2",
      "1",
      "3"
    ]
  },
  {
    "location": "Central India",
    "zones": []
  },
  {
    "location": "Korea Central",
    "zones": []
  }
]

[feiskyer]

/milestone v1.21

[feiskyer]

Let's confirm whether the API version is available in all regions before working on the task.

[feiskyer]

Confirmed 2020-08-01 API is available in all regions. @nilo19 we could start this work now.