Azure Functions Hosting Plans Overview

Overview

Azure Functions provides three distinct hosting plans that determine how your functions are executed, scaled, and billed. Understanding these hosting options is crucial for optimizing both performance and cost. Each plan offers different capabilities suited for different scenarios - from low-cost testing environments to enterprise-grade deployments requiring VNet integration.

What You'll Learn

• Comparing the three hosting plans: Consumption, Premium, and Dedicated
• Understanding scaling behavior and cost implications
• Determining which plan best suits your use case
• How to switch between hosting plans

Choosing the Right Plan

The hosting plan you choose impacts your application's behavior:

• Consumption - Pay only for what you use, ideal for variable workloads
• Premium - Pre-warmed instances with VNet support for production apps
• Dedicated - Use existing App Service plans for enterprise scenarios

Comparison Table

1. Consumption Plan (Default)

How It Works

• Functions scale automatically based on load
• You pay only for execution time
• Idle = $0 cost
• Cold starts possible

Best For

• Webhook handlers
• Event-driven processing
• Variable workloads
• Cost-sensitive scenarios

Pricing

• Execution time: ~$0.000016/GB-second
• Executions: ~$0.20 per million

2. Premium Plan

How It Works

• Always ready instances (pre-warmed)
• Faster scaling
• VNet connectivity
• No cold starts

Best For

• High-throughput apps
• Low-latency requirements
• VNet integration needed
• Long-running operations

Pricing

• Pay for instances (vCPU + RAM)
• ~$0.016/vCPU-hour

3. Dedicated (App Service) Plan

How It Works

• Runs on App Service plan
• Manual or auto-scaling
• Use existing App Service resources
• Always warm

Best For

• Existing App Service customers
• Need for other App Services
• High memory needs
• Bring your own infrastructure

How to Choose

High traffic, low latency?
    YES → Premium
    NO ↓
Need VNet or always-on?
    YES → Premium or Dedicated
    NO ↓
Variable workload, pay-per-use?
    YES → Consumption
    NO → Premium

Change Hosting Plan

Via Portal

1. Go to Function App
2. Select App Service plan
3. Click Change App Service plan
4. Select new plan
5. Save

Via CLI

# Create Premium plan
az functionapp plan create \
  --resource-group my-rg \
  --name my-premium-plan \
  --location eastus \
  --sku EP1

# Update function app
az functionapp update \
  --resource-group my-rg \
  --name my-function \
  --plan my-premium-plan

Next Steps

• Explore Timer Trigger Basics

Azure Integration Hub - Beginner Level