An Azure Function App is a service within Microsoft Azure that allows you to run small pieces of code, known as functions, in a serverless environment, which keeps costs down and reliability up.
You can think of Azure Function Apps as equivalent to a Scheduled Task on a Windows computer.
One of the most popular use cases for an Azure Function App is processing file uploads. This involves using Azure Functions to handle files as they are uploaded to Azure Blob Storage. For example, a function can be triggered when a new file is uploaded, allowing you to validate, transform, and process the file in real-time.
Other common use cases include:
Azure Function Apps can be triggered by a variety of events. Here are some common triggers:
These triggers allow developers and IT admins to build flexible and scalable solutions that respond to various events and data changes.
The cost of an Azure Function App depends on the hosting plan you choose. Here are the main options:
Pricing: You pay based on the number of executions and the resources consumed (measured in GB-seconds). This plan includes a monthly free grant of 1 million requests and 400,000 GB-seconds of resource consumption.
Use Case: Ideal for applications with variable or unpredictable workloads.
Pricing: Billed based on the number of instances and the memory provisioned. For example, the Premium V2 tier costs $0.532 per hour.
Use Case: Suitable for applications requiring enhanced performance, VNET integration, or longer execution times.
Pricing: Uses regular App Service plan billing, which is based on the chosen pricing tier3.
Use Case: Best for applications needing dedicated VMs, custom images, or isolation.
Pricing: Combines on-demand and always-ready instances. Includes a monthly free grant of 250,000 executions and 100,000 GB-seconds of resource consumption4.
Use Case: Offers flexibility with dynamic scaling and VNET integration.
For a typical usage scenario, the Consumption Plan is often the most cost-effective, especially if your function app has variable workloads. You can use the Azure Pricing Calculator to get a more precise estimate based on your specific needs.
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