无法删除由后端服务使用的GKE辅助节点池创建的实例组

Question

无法删除后端服务正在使用的实例组

我正在使用terraform来管理GKE群集设置。我想更新工作节点的实例大小，这将重新创建google_container_node_popl，即删除现有实例组并为节点池重新创建新的实例组。但是由于出现以下错误，导致此步骤失败，因为与GCP LB后端连接的旧实例组在重新创建节点池时不会通过地形分离。

 google_container_node_pool.new_container_cluster_node_pool.0: Error waiting for deleting GKE NodePool:
(1) Google Compute Engine: The instance_template resource 'projects/XXX-XXX-XXXX/global/instanceTemplates/gke-XXX-XXX-us-west-XXXXXX-53369325' is already being used by 'projects/XXXX-XXXX-XXXXX/zones/us-west1-b/instanceGroupManagers/gke-XXXXX-XXXX-us-west-XXXXX-XXXXX-us-west-53369325-grp'

最后，我们必须从GCP LB后端手动删除实例组条目，计划并再次应用以使用新实例类型重新创建节点池。

resource "google_compute_backend_service" "default" {
project         = "${var.project}"
count           = "${length(var.backend_params)}"
name            = "${var.name}-backend-${count.index}"
port_name       = "${element(split(",", element(var.backend_params, count.index)), 1)}"
protocol        = "${var.backend_protocol}"
timeout_sec     = "${element(split(",", element(var.backend_params, count.index)), 3)}"
backend         = ["${var.backends["${count.index}"]}"]
health_checks   = ["${element(google_compute_health_check.default-tcp.*.self_link, count.index)}"]
security_policy = "${var.security_policy}"
enable_cdn      = "${var.cdn}"
}

Input variable ( getting the instance groups URL from GKE module)


backends = {
"0" = [
  # Have to use "element" because of nested lists
  {
    group = "${replace(element(module.gke.node_pool_instance_group_urls[0],0), "Manager", "")}",
    balancing_mode = "${var.lb_balancing_mode}",
    max_rate = "${var.lb_max_rate}",
    max_utilization = "${var.lb_max_utilization}"
  },
  {
    group = "${replace(element(module.gke.node_pool_instance_group_urls[0],1), "Manager", "")}",
    balancing_mode = "${var.lb_balancing_mode}",
    max_rate = "${var.lb_max_rate}",
    max_utilization = "${var.lb_max_utilization}"
  },
  {
    group = "${replace(element(module.gke.node_pool_instance_group_urls[0],2), "Manager", "")}",
    balancing_mode = "${var.lb_balancing_mode}",
    max_rate = "${var.lb_max_rate}",
    max_utilization = "${var.lb_max_utilization}"
  },
  {
    group = "${replace(element(module.gke.node_pool_instance_group_urls[1],0), "Manager", "")}",
    balancing_mode = "${var.lb_balancing_mode}",
    max_rate = "${var.lb_max_rate}",
    max_utilization = "${var.lb_max_utilization}"
  },
  {
    group = "${replace(element(module.gke.node_pool_instance_group_urls[1],1), "Manager", "")}",
    balancing_mode = "${var.lb_balancing_mode}",
    max_rate = "${var.lb_max_rate}",
    max_utilization = "${var.lb_max_utilization}"
  },
  {
    group = "${replace(element(module.gke.node_pool_instance_group_urls[1],2), "Manager", "")}",
    balancing_mode = "${var.lb_balancing_mode}",
    max_rate = "${var.lb_max_rate}",
    max_utilization = "${var.lb_max_utilization}"
  }
],

首先，terraform将在重新创建GKE节点池时从GCP LB后端设置中分离当前实例组。