We are considering using the Floating IP of AWS to provide Active/Standby redundancy between EC2 instances located in different Availability Zones (hereafter, AZ).
Floating IP is a method of switching between active EC2 instances by replacing Elastic IP (EIP), but the "benefit" of the link below states that EIP can be transferred to different AZ instances and "caution" states that EIP cannot be transferred beyond subnet.
My understanding is that the subnet should not be able to cross AZ, which would mean that EIP cannot be replaced between AZs. Please let me know if you know anything about this discrepancy or have any reference documents.
aws
The article was written around 2012, so it's helpful to learn about past history, but I feel it's too old for modern design to be useful.
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