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AWS

AWS: Elastic IP

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When an EC2 instance is stopped and started it releases te public IP address and a new public IP address is assigned. In other words, relying on the default assigned IP address is risky.

Elastic IP is a Static IP, which does not change (or gets released) and it associates with the instance itself. Hence, a strong connection is created here.

It is recommended to have an elastic IP along with each instance.