What are IAM roles, and when are they used?

IAM (Identity and Access Management) roles in AWS are a key component for securely delegating permissions within your AWS environment. These roles are used to define a set of permissions for making AWS service requests.

Key Concepts of IAM Roles

1. Role Entities:

   • IAM roles are not associated with a specific user or group.
   • They are assumed by entities such as AWS services, EC2 instances, or applications.

2. Temporary Permissions:

   • IAM roles provide temporary security credentials.
   • They help grant access for a specific duration without the need for long-term access keys.

3. Access Policies:

   • Permissions for IAM roles are defined through access policies.
   • These policies outline the actions allowed or denied on AWS resources.

When Are IAM Roles Used?

IAM roles find applications in various scenarios, demonstrating their versatility and importance:

1. Cross-Account Access:

   • IAM roles facilitate secure access between AWS accounts, promoting collaboration and resource sharing.

2. Federated Access:

   • External identities, such as users authenticated through corporate directories, can assume IAM roles for AWS access.

3. AWS Service Access:

   • IAM roles enable AWS services like EC2 instances to interact securely with other AWS resources.

4. Temporary Access:

   • For tasks requiring temporary elevated permissions, IAM roles are preferred over long-term access keys.

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