iam.tf

# EKS currently documents this required userdata for EKS worker nodes to
# properly configure Kubernetes applications on the EC2 instance.
# We utilize a Terraform local here to simplify Base64 encoding this
# information into the AutoScaling Launch Configuration.
# More information: https://amazon-eks.s3-us-west-2.amazonaws.com/1.10.3/2018-06-05/amazon-eks-nodegroup.yaml

## updated AMI support for /etc/eks/bootstrap.sh
##

resource "aws_iam_role" "eks-node" {
  name = "eks-node"

  assume_role_policy = <<POLICY
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "ec2.amazonaws.com"
      },
      "Effect": "Allow",
      "Sid": ""
    }
  ]
}
POLICY
}

## Kube2IAM - allow worker to assume all roles
resource "aws_iam_role_policy" "kube2iam_worker_policy" {
  name = "kube2iam_worker_policy"
  role = "${aws_iam_role.eks-node.id}"

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "sts:AssumeRole"
      ],
      "Effect": "Allow",
      "Resource": "*"
    }
  ]
}
EOF
}

###
##  Allow worker nodes to send memory metrics to cloudwatch
resource "aws_iam_role_policy" "mem_scaling_worker_policy" {
  name = "mem_scaling_worker_policy"
  role = "${aws_iam_role.eks-node.id}"

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "cloudwatch:PutMetricData",
        "ec2:DescribeTags",
        "cloudwatch:GetMetricStatistics",
        "cloudwatch:ListMetrics"
      ],
      "Effect": "Allow",
      "Resource": "*"
    }
  ]
}
EOF
}

resource "aws_iam_role_policy_attachment" "eks-node-AmazonEKSWorkerNodePolicy" {
  policy_arn = "arn:aws:iam::aws:policy/AmazonEKSWorkerNodePolicy"
  role       = "${aws_iam_role.eks-node.name}"
}

resource "aws_iam_role_policy_attachment" "eks-node-AmazonEKS_CNI_Policy" {
  policy_arn = "arn:aws:iam::aws:policy/AmazonEKS_CNI_Policy"
  role       = "${aws_iam_role.eks-node.name}"
}

resource "aws_iam_role_policy_attachment" "eks-node-AmazonEC2ContainerRegistryReadOnly" {
  policy_arn = "arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly"
  role       = "${aws_iam_role.eks-node.name}"
}

resource "aws_iam_instance_profile" "eks-node" {
  name = "eks-instance-role"
  role = "${aws_iam_role.eks-node.name}"
}