Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Keepalived On Debian Etch

October 27th, 2007


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Setting Up A High-Availability Load Balancer (With Failover and Session Support) With HAProxy/Keepalived On Debian Etch

This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy
and keepalived on Debian Etch. The load balancer sits between the user
and two (or more) backend Apache web servers that hold the same
content. Not only does the load balancer distribute the requests to the
two backend Apache servers, it also checks the health of the backend
servers. If one of them is down, all requests will automatically be
redirected to the remaining backend server. In addition to that, the
two load balancer nodes monitor each other using keepalived, and if the
master fails, the slave becomes the master, which means the users will
not notice any disruption of the service. HAProxy is session-aware,
which means you can use it with any web application that makes use of
sessions (such as forums, shopping carts, etc.).

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