iamrole.tf

resource "aws_iam_role" "example" {
  name = "example-role"

  assume_role_policy = jsonencode({
    Version = "2012-10-17",
    Statement = [
      {
        Action = "sts:AssumeRole",
        Effect = "Allow",
        Principal = {
          Service = "ec2.amazonaws.com" # Or another service, like lambda.amazonaws.com
        }
      },
    ],
  })

  tags = {
    TagKey = "TagValue"
  }
}

resource "aws_iam_policy" "example" {
  name        = "example-policy"
  description = "Example policy"

  policy = jsonencode({
    Version = "2012-10-17",
    Statement = [
      {
        Action = [
          "s3:GetObject",
          "s3:ListBucket",
        ],
        Effect   = "Allow",
        Resource = [
          "arn:aws:s3:::example-bucket/*",
          "arn:aws:s3:::example-bucket",
        ],
      },
    ],
  })
}

resource "aws_iam_role_policy_attachment" "example" {
  role       = aws_iam_role.example.name
  policy_arn = aws_iam_policy.example.arn
}

#Optional: Instance Profile, to use the role with EC2 instances.
resource "aws_iam_instance_profile" "example" {
  name = "example-instance-profile"
  role = aws_iam_role.example.name
}

output "iam_role_arn" {
  value = aws_iam_role.example.arn
}

output "iam_instance_profile_arn" {
  value = aws_iam_instance_profile.example.arn
}