Network Load Balancing

Network Load Balancing (NLB) distributes traffic across multiple hosts to improve scalability and availability of IP-based services. It detects failures and automatically reroutes traffic to healthy servers.

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Benefits of Network Load Balancing

Scalability

Network Load Balancing improves server performance by distributing client requests across multiple servers, allowing easy scaling by adding more servers as traffic grows.

High availability

Network Load Balancing ensures high availability by detecting server failures and redistributing traffic to remaining servers within seconds, maintaining uninterrupted service.

Manageability

Manage multiple NLB clusters and hosts from a single system using NLB Manager or PowerShell cmdlets.

HA Database Solution

Network Load Balancing Solutions

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Solution 1 - IIS ARR + Microsoft NLB + IIS

Making IIS website Highly Available using IIS ARR and Microsoft NLB. Applies to: Windows Server 2025/2022/2019/2016, IIS 7.0 and above.

Example of implementation
Configure ARR1+NLB, ARR2+NLB to be Windows Load Balancing servers, which provides high availability and scalability for the content servers. ARR is built as a module on top of IIS and is designed to make the routing decisions at layer 7 (application). NLB makes the routing decisions at layer 3.

Solution 2 - LVS/HAProxy + Keepalived + Nginx

Making Nginx website Highly Available using LVS/HAProxy and Keepalived. Applies to: CentOS 8.x/7.x, Ubuntu 20.x/18.x LTS

Implementation example
Prepare 7 CentOS 7.x hosts and a virtual IP(VIP) address: 192.168.1.4
The load balancer will use 2 hosts, one primary and one standby
lb1 (default primary): 192.168.1.2
lb2 (default standby): 192.168.1.3
The back-end web servers powered by nginx
web servers: Web-1 Web-2 Web-3
image servers: Img-1 Img-2

FAQ

Network Load Balancing FAQs

Frequently asked questions about HNetwork Load Balancing service.

Network Load Balancing (NLB) distributes traffic across multiple servers to prevent overload and improve performance.

Use NLB for high or spiky traffic, static or elastic IP needs, and multi-port or container-based applications.

Application Request Routing (ARR) is an IIS feature used for load balancing across servers with a user-friendly interface, often combined with NLB for high availability.

LVS is an open-source load balancing project for Linux that provides high performance, scalability, and reliability using clustering technology.

NLB uses TCP/IP to distribute incoming traffic across multiple servers in a cluster, improving reliability and performance.

It prevents server overload, improves performance and availability, and ensures fast and reliable request handling.

HAProxy is a fast, reliable open-source load balancer and reverse proxy widely used for high-traffic TCP and HTTP applications.

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