deployment/terraform-module-knfsd/autoscaler.tf

/**
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

# Autoscaler that scales up the Knfsd cluster depending on the number of NFS Connections
resource "google_compute_autoscaler" "knfsd-autoscaler" {

  // Count is used here to determine if the autoscaler policy should be created
  // If var.ENABLE_KNFSD_AUTOSCALING is true then we want 1 autoscaler rule, else 0
  count = var.ENABLE_KNFSD_AUTOSCALING ? 1 : 0

  name   = "${var.PROXY_BASENAME}-autoscaler"
  zone   = var.ZONE
  target = google_compute_instance_group_manager.proxy-group.id

  autoscaling_policy {
    max_replicas    = var.KNFSD_AUTOSCALING_MAX_INSTANCES
    min_replicas    = var.KNFSD_AUTOSCALING_MIN_INSTANCES
    cooldown_period = 165
    mode            = "ONLY_UP"

    metric {
      name   = "custom.googleapis.com/knfsd/nfs_connections"
      target = var.KNFSD_AUTOSCALING_NFS_CONNECTIONS_THRESHOLD
      type   = "GAUGE"
    }
  }

}