Tag Archives: performance

HAProxy, Varnish and the single hostname website

As explained in a previous article, HAProxy and Varnish are two great OpenSource software which aim to improve performance, resilience and scalability of web applications. We saw also that these two softwares are not competitors. Instead of that, they can … Continue reading

Posted in Aloha, architecture, HAProxy, performance | Tagged , , , , , , , , , , | 32 Comments

HAProxy and Varnish comparison

In opensource world, there are some very smart products which are very often used to build a high performance, reliable and scalable architecture. HAProxy and Varnish are both in this category. Since we can’t really compare a reverse-proxy cache and … Continue reading

Posted in HAProxy, performance | Tagged , , , , , , , | 7 Comments

Hypervisors virtual network performance comparison from a Virtualized load-balancer point of view

Introduction At HAProxy Technologies, we edit and sell a Load-Balancer appliance called ALOHA (stands for Application Layer Optimisation and High-Availability). A few month ago, we managed to make it run on the most common hypervisors available: VMWare (ESX, vsphere) Citrix … Continue reading

Posted in benchmark, performance | Tagged , , , | 15 Comments

Web traffic limitation

Synopsis For different reason, we may want to limit the number of connections or the number of requests we allow to a web farm. In example: give more capacity to authenticated users compared to anonymous one limit web farm users … Continue reading

Posted in Aloha, HAProxy, optimization | Tagged , , , , | 2 Comments

Scaling out SSL

Synopsis We’ve seen recently how we could scale up SSL performance. But what about scaling out SSL performance? Well, thanks to Aloha and HAProxy, it’s easy to manage smartly a farm of SSL accelerator servers, using persistence based on the … Continue reading

Posted in benchmark, optimization, ssl | Tagged , , , | 8 Comments

Benchmarking SSL performance

Introduction The story Recently, there has been some attacks against website which aimed to steal user identity. In order to protect their users, major website owners had to find a solution. Unfortunately, we know that sometimes, improving security means downgrading performance. … Continue reading

Posted in benchmark, ssl | Tagged , , , , | 21 Comments

How to play with maxconn to avoid server slowness or crash

Using Aloha load balancer and HAProxy, it is easy to protect any application or web server against unexpected high load. Introduction The response time of web servers is directly related to the number of requests they have to manage at … Continue reading

Posted in Aloha, performance | Tagged , , | 8 Comments