I've got an EC2 instance running a Docker container that uploads files to an S3 bucket. I've set up a role with the necessary permissions and established a trust relationship for the EC2 instance to assume that role. Here's what I have for the trust relationship: it allows the EC2 service to perform the AssumeRole action.
Inside my container, I created a .aws/config file that includes a profile pointing to the role's ARN and specifies the credential source as Ec2InstanceMetadata. The region is set to us-east-1. I've also mapped the .aws folder from the host to the container so that it can access the configuration.
Since my EC2 instance is using IMDSv2 with a hop count set to 2, I'm running this command in the container: "aws sts get-caller-identity," but I keep getting an AccessDenied error saying I'm not authorized to perform the AssumeRole operation for that role. What could be causing this?
2 Answers
Make sure to check for any other policies attached to your instance role. If there's a policy that denies access, it will override any allows you have set. Those 'deny' statements take precedence and can lead to unexpected access issues.
It sounds like your trust relationship setup is correct, but don’t forget that the EC2 instance's role policy also needs to explicitly allow the 'sts:AssumeRole' action on the resource you want it to assume. If it's missing, that could lead to the AccessDenied error you're seeing.
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