An Introduction to HAProxy and Load Balancing Concepts | DigitalOcean
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A *high availability* (HA) setup is broadly defined as infrastructure without a single point of failure. It prevents a single server failure from being a downtime event by adding redundancy to every layer of your architecture. A load balancer facilitates redundancy for the backend layer (web/app servers), but for a true high availability setup, you need to have redundant load balancers as well.