azure-quotas

SKILL.md

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

MCP Server
azure-quota MCP server — NEVER use this. It is unreliable. Always use az quota CLI instead.

Required Permission
Reader (view) or Quota Request Operator (manage)

⚠️ ALWAYS USE CLI FIRST

REST API and Portal can show misleading "No Limit" values — this does not mean unlimited capacity. It means the quota API doesn't support that resource type. Always start with az quota commands; fall back to Azure service limits docs if CLI returns BadRequest.

For complete CLI reference, 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:

List all quotas for the resource provider:

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

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

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 - Resource Name Mapping

Scripts

Pre-built scripts handle quota extension installation, usage queries, and capacity calculation. Use these instead of constructing commands manually. A single call returns limits, usage, and available capacity.

Script
Purpose
Usage

scripts/check-quota.ps1
Returns limit, usage, and available capacity for all quotas (or a single quota when resource name is provided)
Primary script for quota checks

scripts/check-quota.sh
Same as above (bash)
Primary script for quota checks

Core Workflows

Workflow 1: Check Quota for a Specific Resource

Scenario: Verify quota limits and current usage before deployment

Run the script with the resource provider and region. It returns a table of all quotas with their limit, current usage, and available capacity in a single call:

.\scripts\check-quota.ps1 -ResourceProvider <provider> -Region <region>

./scripts/check-quota.sh <provider> <region>

To check a single resource, add the resource name:

.\scripts\check-quota.ps1 -ResourceProvider <provider> -Region <region> -ResourceName <resource-name>

./scripts/check-quota.sh <provider> <region> <resource-name>

Example:

.\scripts\check-quota.ps1 -ResourceProvider Microsoft.Compute -Region eastus

Example Output:

Resource
Region
Limit
Usage
Available

cores
eastus
100
50
50

standardDSv3Family
eastus
350
50
300

virtualMachines
eastus
25000
5
24995

...
...
...
...
...

📖 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: commands.md for full scripted multi-region loop patterns

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"
Misleading — not unlimited
Use CLI instead; see warning in Quick Reference

ExtensionNotFound
Quota extension not installed
az extension add --name quota

BadRequest
Resource provider not supported by quota API
Check 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>

CLI commands fail entirely
Auth, extension, or environment issue
Verify Azure CLI login (az account show), reinstall quota extension, check network. Do NOT use the azure-quota MCP server — it is unreliable.

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

CLI Commands Reference
commands.md - Complete syntax, parameters, examples

Azure Quotas Overview
Microsoft Learn

Service Limits Documentation
Azure subscription limits

Azure Portal - My Quotas
Portal Link

Request Quota Increases
How to request increases

Best Practices

✅ Always check quotas before deployment - Prevent quota exceeded errors

✅ Run az quota list first - Discover correct quota resource names

✅ Compare regions - Find regions with available capacity

✅ Account for growth - Request 20% buffer above immediate needs

✅ Use table output for overview - --output table for quick scanning

✅ Monitor usage trends - Set up alerts at 80% threshold (via Portal)