Azure Load Balancer
Load balancing software
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What is Azure Load Balancer
Azure Load Balancer is a managed Layer 4 (TCP/UDP) load balancing service on Microsoft Azure that distributes inbound and outbound traffic across virtual machines, scale sets, and other IP-based endpoints. It is used by cloud infrastructure and application teams to improve availability and network resiliency for services hosted in Azure virtual networks. The service supports public and internal load balancers, health probes, and rule-based traffic distribution, and it integrates with Azure networking constructs such as VNets, subnets, and network security groups.
Native Azure networking integration
Azure Load Balancer integrates directly with Azure VNets, subnets, NICs, and IP resources, reducing the need to deploy and manage separate load balancer appliances. It works with Azure Virtual Machine Scale Sets and can distribute traffic across instances as they scale. Configuration aligns with Azure’s resource model and role-based access control, which helps standardize operations for Azure-centric teams.
High-performance L4 load balancing
The service focuses on Layer 4 load balancing for TCP and UDP, which fits high-throughput, low-latency scenarios where application-layer routing is not required. It supports health probes and load balancing rules to route traffic only to healthy backends. This makes it suitable for foundational network load distribution in front of services such as web tiers, APIs, and custom TCP/UDP workloads.
Supports internal and public endpoints
Azure Load Balancer can be deployed as an internet-facing (public) load balancer or as an internal load balancer for private services within a virtual network. This supports common patterns such as exposing a public frontend while keeping backend services private. It also supports outbound connectivity scenarios via load balancer outbound rules, which can centralize egress behavior for backend pools.
Limited application-layer features
As a Layer 4 service, it does not provide native HTTP/HTTPS features such as path-based routing, header manipulation, TLS termination, or WAF capabilities. Teams needing advanced L7 traffic management typically require an additional Azure service or a separate proxy/ingress component. This can increase architectural complexity when both L4 and L7 controls are needed.
Azure-only deployment scope
Azure Load Balancer is designed for workloads running in Azure virtual networks and does not operate as a portable, multi-cloud load balancer. Organizations with hybrid or multi-cloud requirements may need separate products and operational processes across environments. This can reduce consistency for teams aiming to standardize traffic management across different infrastructure providers.
Operational complexity for advanced setups
More complex configurations (multiple frontends, rules, probes, outbound rules, and NAT) can be difficult to reason about without strong Azure networking expertise. Troubleshooting often requires understanding interactions among NSGs, UDRs, NIC settings, and backend pool membership. Compared with some software-based proxies, observability and debugging can feel less application-centric because the service operates at the network layer.
Plan & Pricing
Pricing model: Pay-as-you-go Free tier/trial: Azure Free Account — 750 hours, 15 GB of data processing, and up to five rules with Standard Load Balancer (12 months). See Azure Free Services for details. Pricing components (as listed on Microsoft Azure official pricing page):
- Standard Load Balancer (Regional tier / Global tier):
- First 5 rules — hourly charge
- Additional rules — charge per rule per hour
- Inbound NAT rules — Free
- Data processed (GB) — charged for Regional tier; Global tier shows no additional data-processed charge
- Gateway Load Balancer:
- Gateway hour — hourly charge
- Chain hour — hourly charge
- Data processed (GB) — charged per GB Example costs: Official Azure pricing page displays region- and currency-specific rates in the Azure Pricing Calculator (dynamic); static numeric rates are not shown on the pricing page HTML without selecting region/currency. For exact per-region numeric rates, use the Azure Pricing Calculator or contact Azure sales. (See Pricing—Load Balancer and Pricing Calculator.) Discount options / purchase notes: Prices are estimates and vary by agreement, region, and currency. Microsoft directs customers to the Azure Pricing Calculator, Azure sales specialists, or Azure partners for quotes and purchasing options. Also note bandwidth (data transfer) charges may apply in addition to Load Balancer data-processed charges.
Seller details
Microsoft Corporation
Redmond, Washington, United States
1975
Public
https://www.microsoft.com/
https://x.com/Microsoft
https://www.linkedin.com/company/microsoft/
