Instance Metadata Service: EC2 instances have access to an internal metadata service. It provides instance-specific information like instance ID, security groups, and public IP address.
Accessing Metadata:
Make an HTTP GET request to the base URL: http://169.254.169.254/latest/meta-data/
You'll get a list of available categories. The public IPv4 address is under public-ipv4.
References:
Instance Metadata and User Data: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html
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