Not able to pull image from AWS ECR on my ECS instance

Question

I am running ECS instance with amazon provide ECSInstance role, whose policies in JSON looks like below:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeTags",
                "ecs:CreateCluster",
                "ecs:DeregisterContainerInstance",
                "ecs:DiscoverPollEndpoint",
                "ecs:Poll",
                "ecs:RegisterContainerInstance",
                "ecs:StartTelemetrySession",
                "ecs:UpdateContainerInstancesState",
                "ecs:Submit*",
                "ecr:GetAuthorizationToken",
                "ecr:BatchCheckLayerAvailability",
                "ecr:GetDownloadUrlForLayer",
                "ecr:BatchGetImage",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": "*"
        }
    ]
}

I can see ECR specific access which includes Submit* and "ecr:BatchGetImage" etc, using which I should be simply able to pull any images in my ECR but when I try to do that, it gives me below error:

An error occurred (AccessDeniedException) when calling the DescribeRepositories operation: User: arn:aws:sts::755671380468:assumed-role/ecsInstanceRole/i-0e3a77458fe98d842 is not authorized to perform: ecr:DescribeRepositories on resource: arn:aws:ecr:ap-south-1:755671380468:repository/*

Now, As error message indicates it doesn't have ecr:DescribeRepositories and when I tried to add inline policy and searched for ecr It didn't give any result, so how can I add this or some other policy to my existing role so that my ECS instance is able to download and push the images to ECR?

Answer 1

You can add the following inline policy to your ECSInstance role, and check how it goes:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": "ecr:DescribeRepositories",
            "Resource": "*"
        }
    ]
}