load-balancing

Difference between frontend/backend and listen in haproxy

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All three are called “proxies.” A listen is a combined frontend and backend. A listen has an implicit default_backend of itself, but the frontend logic of a listen can use other backends and its backend section can be used by other frontends. Fundamentally it just keep configuration more compact for simple rules, but otherwise it’s … Read more

Web App: High Availability / How to prevent a single point of failure?

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I have found this article on the subject: http://www.tenereillo.com/GSLBPageOfShame.htm Basically if you do not require long lasting sticky sessions you can configure your DNS servers to return multiple A records (IP addresses) for your website. Web browsers are smart enough to try all the addresses until they find one that works.