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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
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
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
The backend pool is a critical component of the load balancer. The backend pool defines the group of resources that serve traffic for a given load-balancing rule. There are two ways of configuring a backend pool: Network Interface Card (NIC) IP address To preallocate a backend pool with an IP addres
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 .
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
An Azure Load Balancer health probe is a feature that detects the health status of your application instances. It sends a request to the instances to check if they're available and responding to requests. The health probe can be configured to use different protocols such as TCP, HTTP, or HTTPS. It's
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
