Can not modify or delete the subnet

Question

When I try to modify the delegate of subnet or delete the subnet, the error will occur: Failed to save subnet 'Public'. Error: 'Subnet VNet/Public requires any of the following delegation(s) [Microsoft.ContainerInstance/containerGroups] to reference service association link /subscriptions/xxx-xxx/resourceGroups/NetworkWatcherRG/providers/Microsoft.Network/virtualNetworks/VNet/subnets/Public/serviceAssociationLinks/acisal.'
It used to serving a container instance, but recently the CI has been migrated to kubernetes and the original one has deleted. But the related subnet can't modify.

Answer 1

@William A Wang , This is expected due to the orphaned service association link. Here are the commands you can try to delete the subnet,

  # log into Azure  
    az login  
       
    # Set the name of your resource group  
    RES_GROUP=TestRG  
           
    # Get network profile ID  
    NETWORK_PROFILE_ID=$(az network profile list --resource-group $RES_GROUP --query [0].id --output tsv)  
           
    # Delete the network profile  
     az network profile delete --id $NETWORK_PROFILE_ID -y  
              
    # Get the service association link (SAL) ID  
    SAL_ID=$(az network vnet subnet show --resource-group $RES_GROUP --vnet-name TestRGVirtualNetwork --name TestRGSubnet1 --query id --output tsv)/providers/Microsoft.ContainerInstance/serviceAssociationLinks/default  
            
    # Delete the default SAL ID for the subnet  
    az resource delete --ids $SAL_ID --api-version (The api version of the resource (omit for the latest stable version))  
       
    # Delete the subnet delegation to Azure Container Instances  
    az network vnet subnet update --resource-group $RES_GROUP --vnet-name TestRGVirtualNetwork --name TestRGSubnet1 --remove delegations 0  
      
    # Delete the subnet  
    az network vnet subnet delete --resource-group $RES_GROUP --vnet-name TestRGVirtualNetwork --name TestRGSubnet1  
       
    # Delete virtual network  
    az network vnet delete --resource-group $RES_GROUP --name TestRGVirtualNetwork  

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