Use valid Load Balancer names

November 27, 2025 · View on GitHub

SYNOPSIS

Load Balancer names should meet naming requirements.

DESCRIPTION

When naming Azure resources, resource names must meet service requirements. The requirements for Load Balancer names are:

Between 1 and 80 characters long.
Alphanumerics, underscores, periods, and hyphens.
Start with alphanumeric.
End alphanumeric or underscore.
Load Balancer names must be unique within a resource group.

RECOMMENDATION

Consider using names that meet Load Balancer naming requirements. Additionally consider naming resources with a standard naming convention.

EXAMPLES

Configure with Bicep

To deploy load balancers that pass this rule:

Set the name property to a string that matches the naming requirements.
Optionally, consider constraining name parameters with minLength and maxLength attributes.

For example:

@minLength(1)
@maxLength(80)
@description('The name of the resource.')
param name string

@description('The location resources will be deployed.')
param location string = resourceGroup().location

resource internal_lb 'Microsoft.Network/loadBalancers@2024-05-01' = {
  name: name
  location: location
  sku: {
    name: 'Standard'
    tier: 'Regional'
  }
  properties: {
    frontendIPConfigurations: [
      {
        name: 'frontendIPConfig'
        properties: {
          privateIPAllocationMethod: 'Dynamic'
          subnet: {
            id: subnetId
          }
        }
        zones: [
          '1'
          '2'
          '3'
        ]
      }
    ]
  }
}

Configure with Azure template

To deploy load balancers that pass this rule:

Set the name property to a string that matches the naming requirements.
Optionally, consider constraining name parameters with minLength and maxLength attributes.

For example:

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "name": {
      "type": "string",
      "minLength": 1,
      "maxLength": 80,
      "metadata": {
        "description": "The name of the resource."
      }
    },
    "location": {
      "type": "string",
      "defaultValue": "[resourceGroup().location]",
      "metadata": {
        "description": "The location resources will be deployed."
      }
    }
  },
  "resources": [
    {
      "type": "Microsoft.Network/loadBalancers",
      "apiVersion": "2024-05-01",
      "name": "[parameters('name')]",
      "location": "[parameters('location')]",
      "sku": {
        "name": "Standard",
        "tier": "Regional"
      },
      "properties": {
        "frontendIPConfigurations": [
          {
            "name": "frontendIPConfig",
            "properties": {
              "privateIPAllocationMethod": "Dynamic",
              "subnet": {
                "id": "[parameters('subnetId')]"
              }
            },
            "zones": [
              "1",
              "2",
              "3"
            ]
          }
        ]
      }
    }
  ]
}

NOTES

This rule does not check if Load Balancer names are unique.