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I have a very basic question, we all know that when we configure HAProxy in the Active-Passive manner then there is a VIP. Outside service will access the VIP and the traffic will be routed to appropriate inner services. Now, my question is if the LAN connectivity between the Active-Passive HAProxy goes down will the VIP still be able to perform the same task? Or the behavior will be different?

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It all depends on what software you use for VIP management. But the most likely scenario is that both instances will try to allocate the VIP and that might cause a major outage. This is known as a split-brain situation, read up on it in the internet.

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