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Important On September 30, 2025, Basic Load Balancer was retired. For more information, see the official announcement . If you're currently using Basic Load Balancer, upgrade to Standard Load Balancer as soon as possible. For guidance on upgrading, see Upgrading from Basic Load Balancer - Guidance .
In this article, you learn how to attach a cross-subscription backend to an Azure Load Balancer by creating a cross-subscription backend pool and attaching cross-subscription network interfaces to the backend pool of the load balancer. A cross-subscription load balancer can reference a virtual netwo
Azure Load Balancer is a networking service that distributes inbound traffic across a group of backend resources to improve the scalability and availability of your applications. Understanding its components helps you configure how the load balancer distributes traffic, monitor the health of backend
Azure Load Balancer supports multiple frontend IP configurations on a single resource. Each frontend provides an independent entry point for inbound traffic, so you can expose multiple services, domains, or protocols through one load balancer. This article explains when multiple frontends are useful
Azure Standard Load Balancer helps you load-balance all protocol flows on all ports simultaneously when you use an internal load balancer with high availability (HA) ports. HA ports are a type of load-balancing rule that provides an easy way to load-balance all flows that arrive on all ports of an i
Azure Load Balancer supports cross-subscription load balancing, where the frontend IP and backend pool instances can be in different subscriptions from the Azure Load Balancer. This article provides an overview of cross-subscription load balancing with Azure Load Balancer, and the scenarios it suppo
This article discusses a collection of Azure best practices for your load balancer deployment. These best practices are derived from our experience with Azure networking and the experiences of customers like yourself. For each best practice, this article explains: What the best practice is Why you w
In this article, you learn to create a custom API for HTTP health probes using Python, FLASK, and psutil. Health checks are performed on backend instances using HTTP GET and marked as healthy or unhealthy based on the response. The custom probe in this article marks instances as unhealthy if their C
Administrative state (Admin state) is a feature of Azure Load Balancer that allows you to override the Load Balancer's health probe behavior on a per backend pool instance basis. This feature is useful in scenarios where you would like to take down your backend instance for maintenance, patching, or
