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Which technique should be chosen for IP failover with manual control

I have the following setup, Linux stack, with front-end running nginx proxy and static assets and back-end running Ruby on Rails and MySQL in master-master replication: Primary site: front-end.a, ...
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UCARP: prevent the original master from taking over the VIP when it comes back after failure?

Keepalived can do this by combining the nopreempt option and the BACKUP state on the both nodes: Prevent VRRP Master from becoming Master once it has failed Prevent master to fall back to master ...