AWS Certified Cloud Practitioner
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Which of the following is the secure way of using AWS API to call AWS services from EC2 Instances
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A
IAM Users
B
IAM Roles
C
IAM Groups
D
IAM policies
Explanation:
IAM Roles are the secure way to use AWS API from EC2 instances because:
- IAM Roles provide temporary security credentials that are automatically rotated
- They don't require storing long-term credentials (access keys/passwords) on the EC2 instance
- Roles can be assumed by the EC2 instance service, eliminating the need to manage credentials
- Temporary credentials reduce the risk of credential exposure
- AWS automatically manages the credential lifecycle
Why other options are less secure:
- IAM Users: Require long-term access keys that must be stored on the instance
- IAM Groups: Are containers for users, not credentials themselves
- IAM Policies: Define permissions but don't provide credentials
The AWS documentation confirms that IAM roles are intended to be assumable by anyone who needs them and provide temporary security credentials dynamically.
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