Azure Quotas - Service Limits & Capacity Management

AUTHORITATIVE GUIDANCE — Follow these instructions exactly for quota management and capacity validation.

Overview

What are Azure Quotas?

Azure quotas (also called service limits) are the maximum number of resources you can deploy in a subscription. Quotas:

• Prevent accidental over-provisioning
• Ensure fair resource distribution across Azure
• Represent available capacity in each region
• Can be increased (adjustable quotas) or are fixed (non-adjustable)

Key Concept: Quotas = Resource Availability

If you don't have quota, you cannot deploy resources. Always check quotas when planning deployments or selecting regions.

When to Use This Skill

Invoke this skill when:

• Planning a new deployment - Validate capacity before deployment
• Selecting an Azure region - Compare quota availability across regions
• Troubleshooting quota exceeded errors - Check current usage vs limits
• Requesting quota increases - Submit increase requests via CLI or Portal
• Comparing regional capacity - Find regions with available quota
• Validating provisioning limits - Ensure deployment won't exceed quotas

Quick Reference

Property	Details
Primary Tool	Azure CLI (az quota) - USE THIS FIRST, ALWAYS
Extension Required	az extension add --name quota (MUST install first)
Key Commands	az quota list, az quota show, az quota usage list, az quota usage show
Complete CLI Reference	commands.md
Azure Portal	My quotas - Use only as fallback
REST API	Microsoft.Quota provider - Unreliable, do NOT use first
Required Permission	Reader (view) or Quota Request Operator (manage)

⚠️ CRITICAL: ALWAYS USE CLI FIRST

Azure CLI (az quota) is the ONLY reliable method for checking quotas. Use CLI FIRST, always.

DO NOT use REST API or Portal as your first approach. They are unreliable and misleading.

Why you must use CLI first:

• REST API is unreliable and shows misleading results
• REST API "No Limit" or "Unlimited" values DO NOT mean unlimited capacity
• "No Limit" typically means the resource doesn't support quota API (not unlimited!)
• CLI provides clear BadRequest errors when providers aren't supported
• CLI has consistent output format and better error messages
• Portal may show incomplete or cached data

Mandatory workflow:

1. FIRST: Try az quota list / az quota show / az quota usage show
2. If CLI returns BadRequest: Then use Azure service limits docs
3. Never start with REST API or Portal - only use as last resort

If you see "No Limit" in REST API/Portal: This is NOT unlimited capacity. It means:

• The quota API doesn't support that resource type, OR
• The quota isn't enforced via the API, OR
• Service-specific limits still apply (check documentation)

For complete CLI command reference and examples, see commands.md.

Quota Types

Type	Adjustability	Approval	Examples
Adjustable	Can increase via Portal/CLI/API	Usually auto-approved	VM vCPUs, Public IPs, Storage accounts
Non-adjustable	Fixed limits	Cannot be changed	Subscription-wide hard limits

Important: Requesting quota increases is free. You only pay for resources you actually use, not for quota allocation.

Understanding Resource Name Mapping

⚠️ CRITICAL: There is NO 1:1 mapping between ARM resource types and quota resource names.

Example Mappings

ARM Resource Type	Quota Resource Name
Microsoft.App/managedEnvironments	ManagedEnvironmentCount
Microsoft.Compute/virtualMachines	standardDSv3Family, cores, virtualMachines
Microsoft.Network/publicIPAddresses	PublicIPAddresses, IPv4StandardSkuPublicIpAddresses

Discovery Workflow

Never assume the quota resource name from the ARM type. Always use this workflow:

1. List all quotas for the resource provider:

   az quota list --scope /subscriptions/<id>/providers/<ProviderNamespace>/locations/<region>
   

2. Match by localizedValue (human-readable description) to find the relevant quota

3. Use the name field (not ARM resource type) in subsequent commands:

   az quota show --resource-name ManagedEnvironmentCount --scope ...
   az quota usage show --resource-name ManagedEnvironmentCount --scope ...
   

📖 Detailed mapping examples and workflow: See commands.md - Understanding Resource Name Mapping

Core Workflows

Workflow 1: Check Quota for a Specific Resource

Scenario: Verify quota limit and current usage before deployment

# 1. Install quota extension (if not already installed)
az extension add --name quota

# 2. List all quotas for the provider to find the quota resource name
az quota list \
  --scope /subscriptions/<subscription-id>/providers/Microsoft.Compute/locations/eastus

# 3. Show quota limit for a specific resource
az quota show \
  --resource-name standardDSv3Family \
  --scope /subscriptions/<subscription-id>/providers/Microsoft.Compute/locations/eastus

# 4. Show current usage
az quota usage show \
  --resource-name standardDSv3Family \
  --scope /subscriptions/<subscription-id>/providers/Microsoft.Compute/locations/eastus

Example Output Analysis:

• Quota limit: 350 vCPUs
• Current usage: 50 vCPUs
• Available capacity: 300 vCPUs (350 - 50)

📖 See also: az quota show, az quota usage show

Workflow 2: Compare Quotas Across Regions

Scenario: Find the best region for deployment based on available capacity

# Define candidate regions
REGIONS=("eastus" "eastus2" "westus2" "centralus")
VM_FAMILY="standardDSv3Family"
SUBSCRIPTION_ID="<subscription-id>"

# Check quota availability across regions
for region in "${REGIONS[@]}"; do
  echo "=== Checking $region ==="
  
  # Get limit
  LIMIT=$(az quota show \
    --resource-name $VM_FAMILY \
    --scope "/subscriptions/$SUBSCRIPTION_ID/providers/Microsoft.Compute/locations/$region" \
    --query "properties.limit.value" -o tsv)
  
  # Get current usage
  USAGE=$(az quota usage show \
    --resource-name $VM_FAMILY \
    --scope "/subscriptions/$SUBSCRIPTION_ID/providers/Microsoft.Compute/locations/$region" \
    --query "properties.usages.value" -o tsv)
  
  # Calculate available
  AVAILABLE=$((LIMIT - USAGE))
  
  echo "Region: $region | Limit: $LIMIT | Usage: $USAGE | Available: $AVAILABLE"
done

📖 See also: Multi-region comparison scripts (Bash & PowerShell)

Workflow 3: Request Quota Increase

Scenario: Current quota is insufficient for deployment

# Request increase for VM quota
az quota update \
  --resource-name standardDSv3Family \
  --scope /subscriptions/<subscription-id>/providers/Microsoft.Compute/locations/eastus \
  --limit-object value=500 \
  --resource-type dedicated

# Check request status
az quota request status list \
  --scope /subscriptions/<subscription-id>/providers/Microsoft.Compute/locations/eastus

Approval Process:

• Most adjustable quotas are auto-approved within minutes
• Some requests require manual review (hours to days)
• Non-adjustable quotas require Azure Support ticket

📖 See also: az quota update, az quota request status

Workflow 4: List All Quotas for Planning

Scenario: Understand all quotas for a resource provider in a region

# List all compute quotas in East US (table format)
az quota list \
  --scope /subscriptions/<subscription-id>/providers/Microsoft.Compute/locations/eastus \
  --output table

# List all network quotas
az quota list \
  --scope /subscriptions/<subscription-id>/providers/Microsoft.Network/locations/eastus \
  --output table

# List all Container Apps quotas
az quota list \
  --scope /subscriptions/<subscription-id>/providers/Microsoft.App/locations/eastus \
  --output table

📖 See also: az quota list

Troubleshooting

Common Errors

Error	Cause	Solution
REST API "No Limit"	REST API showing misleading "unlimited" values	CRITICAL: "No Limit" ≠ unlimited! Use CLI instead. See warning above. Check service limits docs
REST API failures	REST API unreliable and misleading	Always use Azure CLI - See commands.md for complete CLI reference
ExtensionNotFound	Quota extension not installed	az extension add --name quota
BadRequest	Resource provider not supported by quota API	Use CLI (preferred) or service limits docs
MissingRegistration	Microsoft.Quota provider not registered	az provider register --namespace Microsoft.Quota
QuotaExceeded	Deployment would exceed quota	Request increase or choose different region
InvalidScope	Incorrect scope format	Use pattern: /subscriptions/<id>/providers/<namespace>/locations/<region>

Unsupported Resource Providers

Known unsupported providers:

• ❌ Microsoft.DocumentDB (Cosmos DB) - Use Portal or Cosmos DB limits docs

Confirmed working providers:

• ✅ Microsoft.Compute (VMs, disks, cores)
• ✅ Microsoft.Network (VNets, IPs, load balancers)
• ✅ Microsoft.App (Container Apps)
• ✅ Microsoft.Storage (storage accounts)
• ✅ Microsoft.MachineLearningServices (ML compute)

📖 See also: Troubleshooting Guide

Additional Resources

Resource	Link