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?


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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