Launching EC Instance :: A client error (UnauthorizedOperation) occurred when calling the RunInstances operation

Question

I am using AWS CLI and have already configured it using AWS Configure when i launch an EC2 instance using :

C:\>aws ec2 run-instances --dry-run --image-id ami-b5a7ea85 --count 1 --instance
-type t2.micro --key-name ec2_key --iam-instance-profile Arn=arn:aws:iam::132895
064974:instance-profile/ec2Admin

It is giving me :

A client error (UnauthorizedOperation) occurred when calling the RunInstances op
eration: You are not authorized to perform this operation. Encoded authorization
 failure message: 4doSfAQy0gcqKr1O-raIb0C83C2kLWQY8hjZ4gVtwUz6xSAwOtD2wumVnpgsz5

Answer 1

Do you know what this means?

--iam-instance-profile Arn=arn:aws:iam::132895064974:instance-profile/ec2Admin

If you are launching an EC2 instance with an IAM role, then you need to have IAM administrative privilege. It is discussed in detail here

You can also try to decode the error message and see what it says:

aws sts decode-authorization-message --encoded-message 4doSfAQy0gcqKr1O-raIb0C83C2kLWQY8hjZ4gVtwUz6xSAwOtD2wumVnpgsz5