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HA with 3 Load Balancers nodes

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I have the need to build HA cluster (active / passive) load balancers where the primary is handling the requests, and the passive is waiting the primary to become down such that the passive load balancer will become primary once the primary LB is down.

I have accomplished that using heartbeat tool that is available as a package in ubuntu, but my new target is to have HA with 3 LB nodes, is there an alternative tool like heartbeat that allows me to do the same setup but with 3 nodes, as heartbeat tool does not allow to have HA load balancers for more than 2 nodes.

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