How to remove nodes for Custom provider

[angeloudy]

I am using rancher2 provider to provision kuberntes cluster.

Instead of using rancher2_node_pool, I am using the Custom provider to provision my nodes on aws because I wanted to do some other initialisation work. Down the bottom is my code to provision the cluster. It worked well, but the problem is how do I remove nodes? I can reduce the number of aws instances, but the nodes would still show up in the UI.

resource "aws_instance" "multi-worker-nodes" {
  count = 3

  #ami                    = data.aws_ami.ubuntu.id
  #ami                    = "ami-22a44040"
  ami                    = var.images["ubuntu"]
  instance_type          = var.instance_type["worker"]
  key_name               = aws_key_pair.rke-node-key.id
  iam_instance_profile   = aws_iam_instance_profile.rke-aws.name
  vpc_security_group_ids = [aws_security_group.rancher-node-secgrp.id]
  tags                   = local.cluster_id_tag
  subnet_id		 = "${data.aws_subnet.rancher-subnet[count.index % length(data.aws_subnet.rancher-subnet)].id}"
  root_block_device {
    #device_name = "/dev/sda1"
    volume_size = "40"
    volume_type = "gp2"
    delete_on_termination = true
  }


  provisioner "remote-exec" {
    connection {
      host        = coalesce(self.public_ip, self.private_ip)
      type        = "ssh"
      user        = "ubuntu"
      private_key = tls_private_key.node-key.private_key_pem
    }

    inline = [
      "sudo mv /var/lib/apt/lists /var/lib/apt/lists.old",
      "sudo apt-get update",
      "curl https://releases.rancher.com/install-docker/18.09.sh | sh",
      "sudo usermod -a -G docker ubuntu",
      "sudo apt-get install -y salt-minion",
      "sudo bash -c 'echo master: salt.mumba.cloud >> /etc/salt/minion'",
      "sudo service salt-minion restart",
      "${rancher2_cluster.rancher_development.cluster_registration_token.0.node_command} --worker"
    ]
  }
}