Retrieving Instance Metadata - https://docs.aws.amazon.com/AWSEC2/la...
Query metadata (hostname, IAM policy, role secret access key of EC2 instance):
curl http://169.254.169.254/latest/meta-data
IAM credentials (secret key, access key, token) for IAM role for EC2 instance:
curl http://169.254.169.254/latest/meta-data/iam/security-credentials/[iam-role]
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