Knowledge Base | Load Balancing/Routing
Extending HAProxy with the Stream Processing Offload Engine
Christopher FauletThe HAProxy Stream Processing Offload Engine filter enables you to extend HAProxy in any language without modifying its core codebase. Inspired by the possibilities? Read on to learn more. Imagine you're living in the distant future and you're stomping around town in...
Test Driving “Power of Two Random Choices” Load Balancing
Willy TarreauThe Power of Two Random Choices load-balancing algorithm has piqued some curiosity. In this blog post, we see how it stacks up against other modern-day algorithms available in HAProxy. Recently, I was asked twice about my opinion on supporting an algorithm known as...
HAProxy 1.9.2 Adds gRPC Support
Nick RamirezHAProxy provides end-to-end proxying of HTTP/2 traffic. Use HAProxy to route, secure, and observe gRPC traffic over HTTP/2. Read on to learn more. HAProxy 1.9 introduced the Native HTTP Representation (HTX). Not only does this allow you to use HTTP/2 end-to-end, it...
Serving ECC and RSA Certificates on Same IP with HAProxy
Nenad MerdanovicECC and RSA certificates and HTTPS To keep this practical, we will not go into theory of ECC or RSA certificates. Let's just mention that ECC certificates can provide as much security as RSA with much lower key size, meaning much lower computation requirements on the...
HAProxy’s Load-Balancing Algorithm for Static Content Delivery with Varnish
Baptiste AssmannHAProxy's load-balancing algorithms HAProxy supports many load-balancing algorithms which may be used in many different type of cases. That said, cache servers, which deliver most of the time the static content from your web applications, may require some specific...
Microsoft Remote Desktop Services (RDS) Load-Balancing
Baptiste AssmannMicrosoft Remote Desktop services (RDS) Remote Desktop Services, formerly Terminal Services, is a technology from Microsoft that allows users to access remotely to a session-based desktop, virtual machine-based desktop or applications hosted in a datacenter from their...
Web Application Name to Backend Mapping in HAProxy
Baptiste AssmannSynopsis Let's take a web application platform where many HTTP Host header points to. Of course, this platform hosts many backends and HAProxy is used to perform content switching based on the Host header to route HTTP traffic to each backend. HAProxy map HAProxy 1.5...
HOWTO Write Apache ProxyPass* Rules in HAProxy
Baptiste AssmannApache mod_proxy Apache webserver is a widely deployed modular web server. One of its module is called mod_proxy. It aims to turn the web server into a proxy / reverse proxy server with load-balancing capabilities. At HAProxy Technologies, we only use HAProxy :). Heh,...
Asymmetric Routing, Multiple Default Gateways on Linux with HAProxy
Baptiste AssmannWhy we may need multiple default gateways? Nowadays, Application Delivery controllers (aka Load-Balancers) become the entry point for all the applications hosted in a company or administration. That said, many different type of population could access the...
Emulating Active/Passing Application Clustering with HAProxy
Baptiste AssmannSynopsis HAProxy is a Load-Balancer, this is a fact. It is used to route traffic to servers to primarily ensure applications reliability. Most of the time, the sessions are locally stored in a server. Which means that if you want to split client traffic on multiple...
