We will explain this in the Load Balancing Types section. The details can be found in the upcoming Algorithms for Load Balancing section, while mode http is setting up the use of layer 7 proxying.

The line balance roundrobin is intended to specify the load balancing algorithm. Each has two web servers, listening on port 80: In this case, they are a blog-backend and a web-backend. Let’s look at an example of a configuration of two backends. If some of the backend servers go offline, the others will serve as backups for dealing with the request processing. As more servers are added to the backend, the potential load capacity is increased, with processing spread across multiple servers.

A backend could consist of a singular server or multiple servers. In the most basic terms, a backend can be defined by what load balance algorithms to use and a listing of ports and servers. The requests are defined in the backend section of the HAProxy configuration. The Backendįorwarded requests are received by a set of servers referred to as the backend. The HAProxy Configuration Manual contains a detailed guide to ACL usage. For example, this match request would point to. In this case, the ACL is a match if the user’s requested path begins with /blog. This affords the capability to forward traffic optimally based on factors such as backend connections and pattern matching, as well as numerous others.

When it comes to load balancing ACLs are utilized for testing a particular condition and performing an action based on the result. We will begin by reviewing these concepts in the following sections. Essential HAProxy Termsīefore getting into the details of load balancing and proxying, there are some important terms and concepts to become familiar with. This guide will introduce you to HAProxy, acquaint you with the load-balancing terminology, and provide examples of how it could be leveraged to bolster both the performance and reliability of server environments. This type of tool is used in many high-profile environments like Instagram, GitHub, Twitter, and Imgur. It is most commonly used to enhance the reliability and performance of a server environment by providing a balanced distribution of workload across multiple servers. High Availability Proxy (HAProxy), is a popular open-source proxying and TCP/HTTP load balancer solution able to run on Solaris, FreeBSD, and Linux.

Haproxy load balancer