minimal policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "redshift-create-cluster",
            "Effect": "Allow",
            "Action": [
                "redshift:CreateCluster"
            ],
            "Resource": "*"
        },
        {
            "Sid": "passrole",
            "Effect": "Allow",
            "Action": [
                "iam:PassRole"
            ],
            "Resource": "*"
        },
        {
            "Sid": "describe-ec2",
            "Effect": "Allow",
            "Action": [
				       "ec2:DescribeAccountAttributes",
				       "ec2:DescribeAddresses",
				       "ec2:DescribeAvailabilityZones",
				       "ec2:DescribeSecurityGroups",
				       "ec2:DescribeSubnets",
				       "ec2:DescribeVpcs",
				       "ec2:DescribeInternetGateways"
            ],
            "Resource": "*"
        }
    ]
}